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Groovy example source code file (ExpandoMetaClass.java)

This example Groovy source code file (ExpandoMetaClass.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

class, class, closure, closure, expandometaclass, list, metabeanproperty, metaclass, metamethod, metaproperty, object, object, reflection, string, string, threading, threads, util

The Groovy ExpandoMetaClass.java source code

/*
 * Copyright 2003-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package groovy.lang;

import org.codehaus.groovy.reflection.CachedClass;
import org.codehaus.groovy.reflection.MixinInMetaClass;
import org.codehaus.groovy.runtime.DefaultCachedMethodKey;
import org.codehaus.groovy.runtime.DefaultGroovyMethods;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.codehaus.groovy.runtime.MetaClassHelper;
import org.codehaus.groovy.runtime.MethodKey;
import org.codehaus.groovy.runtime.callsite.CallSite;
import org.codehaus.groovy.runtime.callsite.ConstructorMetaMethodSite;
import org.codehaus.groovy.runtime.callsite.PogoMetaClassSite;
import org.codehaus.groovy.runtime.callsite.PojoMetaClassSite;
import org.codehaus.groovy.runtime.callsite.StaticMetaClassSite;
import org.codehaus.groovy.runtime.metaclass.ClosureMetaMethod;
import org.codehaus.groovy.runtime.metaclass.ClosureStaticMetaMethod;
import org.codehaus.groovy.runtime.metaclass.DefaultMetaClassInfo;
import org.codehaus.groovy.runtime.metaclass.MixedInMetaClass;
import org.codehaus.groovy.runtime.metaclass.MixinInstanceMetaMethod;
import org.codehaus.groovy.runtime.metaclass.OwnedMetaClass;
import org.codehaus.groovy.runtime.metaclass.ThreadManagedMetaBeanProperty;
import org.codehaus.groovy.util.FastArray;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * ExpandoMetaClass is a MetaClass that behaves like an Expando, allowing the addition or replacement
 * of methods, properties and constructors on the fly.
 * <p/>
 * Some examples of usage:
 * <pre>
 * // defines or replaces instance method:
 * metaClass.myMethod = { args -> }
 * <p/>
 * // defines a new instance method
 * metaClass.myMethod << { args -> }
 * <p/>
 * // creates multiple overloaded methods of the same name
 * metaClass.myMethod << { String s -> } << { Integer i -> }
 * <p/>
 * // defines or replaces a static method with the 'static' qualifier
 * metaClass.'static'.myMethod = { args ->  }
 * <p/>
 * // defines a new static method with the 'static' qualifier
 * metaClass.'static'.myMethod << { args ->  }
 * <p/>
 * // defines a new constructor
 * metaClass.constructor << { String arg -> }
 * <p/>
 * // defines or replaces a constructor
 * metaClass.constructor = { String arg -> }
 * <p/>
 * // defines a new property with an initial value of "blah"
 * metaClass.myProperty = "blah"
 * </pre>
 * <p/>
 * ExpandoMetaClass also supports a DSL/builder like notation to combine multiple definitions together. So instead of this:
 * <pre>
 * Number.metaClass.multiply = { Amount amount -> amount.times(delegate) }
 * Number.metaClass.div =      { Amount amount -> amount.inverse().times(delegate) }
 * </pre>
 * You can also now do this:
 * <pre>
 * Number.metaClass {
 *     multiply { Amount amount -> amount.times(delegate) }
 *     div      { Amount amount -> amount.inverse().times(delegate) }
 * }
 * </pre>
 * <p/>
 * ExpandoMetaClass also supports runtime mixins. While {@code @Mixin} allows you to mix in new behavior
 * to classes you own and are designing, you can not easily mixin anything to types you didn't own, e.g.
 * from third party libraries or from JDK library classes.
 * Runtime mixins let you add a mixin on any type at runtime.
 * <pre>
 * interface Vehicle {
 *     String getName()
 * }
 * <p/>
 * // Category annotation style
 * {@code @Category}(Vehicle) class FlyingAbility {
 *     def fly() { "I'm the ${name} and I fly!" }
 * }
 * <p/>
 * // traditional category style
 * class DivingAbility {
 *     static dive(Vehicle self) { "I'm the ${self.name} and I dive!" }
 * }
 * <p/>
 * // provided by a third-party, so can't augment using Mixin annotation
 * class JamesBondVehicle implements Vehicle {
 *     String getName() { "James Bond's vehicle" }
 * }
 * <p/>
 * // Can be added via metaClass, e.g.:
 * // JamesBondVehicle.metaClass.mixin DivingAbility, FlyingAbility
 * // Or using shorthand through DGM method on Class
 * JamesBondVehicle.mixin DivingAbility, FlyingAbility
 * <p/>
 * assert new JamesBondVehicle().fly() ==
 *        "I'm the James Bond's vehicle and I fly!"
 * assert new JamesBondVehicle().dive() ==
 *        "I'm the James Bond's vehicle and I dive!"
 * </pre>
 * As another example, consider the following class definitions:
 * <pre>
 * class Student {
 *     List<String> schedule = []
 *     def addLecture(String lecture) { schedule << lecture }
 * }
 * <p/>
 * class Worker {
 *     List<String> schedule = []
 *     def addMeeting(String meeting) { schedule << meeting }
 * }
 * </pre>
 * We can mimic a form of multiple inheritance as follows:
 * <pre>
 * class CollegeStudent {
 *     static { mixin Student, Worker }
 * }
 * new CollegeStudent().with {
 *     addMeeting('Performance review with Boss')
 *     addLecture('Learn about Groovy Mixins')
 *     println schedule
 *     println mixedIn[Student].schedule
 *     println mixedIn[Worker].schedule
 * }
 * </pre>
 * Which outputs these lines when run:
 * <pre>
 * [Performance review with Boss]
 * [Learn about Groovy Mixins]
 * [Performance review with Boss]
 * </pre>
 * Perhaps some explanation is required here. The methods and properties of Student and Worker are
 * added to CollegeStudent. Worker is added last, so for overlapping methods, its methods will
 * be used, e.g. when calling <code>schedule, it will be the schedule property (getSchedule method)
 * from Worker that is used. The schedule property from Student will be shadowed but the <code>mixedIn
 * notation allows us to get to that too if we need as the last two lines show.
 * <p/>
 * We can also be a little more dynamic and not require the CollegeStudent class to
 * be defined at all, e.g.:
 * <pre>
 * def cs = new Object()
 * cs.metaClass {
 *     mixin Student, Worker
 *     getSchedule {
 *         mixedIn[Student].schedule + mixedIn[Worker].schedule
 *     }
 * }
 * cs.with {
 *     addMeeting('Performance review with Boss')
 *     addLecture('Learn about Groovy Mixins')
 *     println schedule
 * }
 * </pre>
 * Which outputs this line when run:
 * <pre>
 * [Learn about Groovy Mixins, Performance review with Boss]
 * </pre>
 * As another example, we can also define a no dup queue by mixing in some
 * Queue and Set functionality as follows:
 * <pre>
 * def ndq = new Object()
 * ndq.metaClass {
 *     mixin ArrayDeque
 *     mixin HashSet
 *     leftShift = { Object o ->
 *         if (!mixedIn[Set].contains(o)) {
 *             mixedIn[Queue].push(o)
 *             mixedIn[Set].add(o)
 *         }
 *     }
 * }
 * ndq << 1
 * ndq << 2
 * ndq << 1
 * assert ndq.size() == 2
 * </pre>
 * As a final example, we sometimes need to pass such mixed in classes or objects
 * into Java methods which require a given static type but the ExpandoMetaClass mixin approach uses a very dynamic
 * approach based on duck typing rather than static interface definitions, so doesn't by default
 * produce objects matching the required static type. Luckily, there is a mixins capability
 * within ExpandoMetaClass which supports the use of Groovy's common 'as StaticType' notation to produce an object
 * having the correct static type so that it can be passed to the Java method call in question.
 * A slightly contrived example illustrating this feature:
 * <pre>
 * class CustomComparator implements Comparator {
 *     int compare(Object a, b) { return a.size() - b.size() }
 * }
 * <p/>
 * class CustomCloseable implements Closeable {
 *     void close() { println 'Lights out - I am closing' }
 * }
 * <p/>
 * import static mypackage.IOUtils.closeQuietly
 * import static java.util.Collections.sort
 * def o = new Object()
 * o.metaClass.mixin CustomComparator, CustomCloseable
 * def items = ['a', 'bbb', 'cc']
 * sort(items, o as Comparator)
 * println items                // => [a, cc, bbb]
 * closeQuietly(o as Closeable) // => Lights out - I am closing
 * </pre>
 * <p/>
 * <b>Further details
 * <p/>
 * When using the default implementations of MetaClass, methods are only allowed to be added before initialize() is called.
 * In other words you create a new MetaClass, add some methods and then call initialize(). If you attempt to add new methods
 * after initialize() has been called, an error will be thrown. This is to ensure that the MetaClass can operate appropriately
 * in multi-threaded environments as it forces you to do all method additions at the beginning, before using the MetaClass.
 * <p/>
 * ExpandoMetaClass differs here from the default in that it allows you to add methods after initialize has been called.
 * This is done by setting the initialize flag internally to false and then add the methods. Since this is not thread
 * safe it has to be done in a synchronized block. The methods to check for modification and initialization are
 * therefore synchronized as well. Any method call done through this meta class will first check if the it is
 * synchronized. Should this happen during a modification, then the method cannot be selected or called unless the
 * modification is completed.
 * <p/>
 * WARNING: This MetaClass uses a thread-bound ThreadLocal instance to store and retrieve properties.
 * In addition properties stored use soft references so they are both bound by the life of the Thread and by the soft
 * references. The implication here is you should NEVER use dynamic properties if you want their values to stick around
 * for long periods because as soon as the JVM is running low on memory or the thread dies they will be garbage collected.
 *
 * @author Graeme Rocher
 * @since 1.5
 */
public class ExpandoMetaClass extends MetaClassImpl implements GroovyObject {

    private static final String META_CLASS = "metaClass";
    private static final String CLASS = "class";
    private static final String META_METHODS = "metaMethods";
    private static final String METHODS = "methods";
    private static final String PROPERTIES = "properties";
    public static final String STATIC_QUALIFIER = "static";
    public static final String CONSTRUCTOR = "constructor";

    private static final String CLASS_PROPERTY = "class";
    private static final String META_CLASS_PROPERTY = "metaClass";
    private static final String GROOVY_CONSTRUCTOR = "<init>";

    // These two properties are used when no ExpandoMetaClassCreationHandle is present

    private MetaClass myMetaClass;
    private boolean initialized;
    private volatile boolean modified;

    private boolean initCalled;
    
    final private boolean allowChangesAfterInit;
    public boolean inRegistry;
    
    private final Set<MetaMethod> inheritedMetaMethods = new HashSet();
    private final Map<String, MetaProperty> beanPropertyCache = new ConcurrentHashMap();
    private final Map<String, MetaProperty> staticBeanPropertyCache = new ConcurrentHashMap();
    private final Map<MethodKey, MetaMethod> expandoMethods = new ConcurrentHashMap();

    public Collection getExpandoSubclassMethods() {
        return expandoSubclassMethods.values();
    }

    private final ConcurrentHashMap expandoSubclassMethods = new ConcurrentHashMap();
    private final Map<String, MetaProperty> expandoProperties = new ConcurrentHashMap();
    private ClosureStaticMetaMethod invokeStaticMethodMethod;
    private final Set<MixinInMetaClass> mixinClasses = new LinkedHashSet();

    private ExpandoMetaClass(Class theClass, boolean register, boolean allowChangesAfterInit, MetaMethod[] add) {
        super(GroovySystem.getMetaClassRegistry(), theClass, add);
        this.myMetaClass = InvokerHelper.getMetaClass(getClass());
        this.inRegistry = register;
        this.allowChangesAfterInit = allowChangesAfterInit;
    }
    
    /**
     * Constructs a new ExpandoMetaClass instance for the given class
     *
     * @param theClass The class that the MetaClass applies to
     */
    public ExpandoMetaClass(Class theClass) {
        this(theClass,false,false,null);
    }

    public ExpandoMetaClass(Class theClass, MetaMethod [] add) {
        this(theClass,false,false,add);
    }

    /**
     * Constructs a new ExpandoMetaClass instance for the given class optionally placing the MetaClass
     * in the MetaClassRegistry automatically
     *
     * @param theClass The class that the MetaClass applies to
     * @param register True if the MetaClass should be registered inside the MetaClassRegistry. This defaults to true and ExpandoMetaClass will effect all instances if changed
     */
    public ExpandoMetaClass(Class theClass, boolean register) {
        this(theClass,register,false,null);
    }

    public ExpandoMetaClass(Class theClass, boolean register, MetaMethod [] add) {
        this(theClass, register, false, add);
    }

    /**
     * Constructs a new ExpandoMetaClass instance for the given class optionally placing the MetaClass
     * in the MetaClassRegistry automatically
     *
     * @param theClass The class that the MetaClass applies to
     * @param register True if the MetaClass should be registered inside the MetaClassRegistry. This defaults to true and ExpandoMetaClass will effect all instances if changed
     * @param allowChangesAfterInit Should the meta class be modifiable after initialization. Default is false.
     */
    public ExpandoMetaClass(Class theClass, boolean register, boolean allowChangesAfterInit) {
        this(theClass, register, allowChangesAfterInit, null);
    }

    public MetaMethod findMixinMethod(String methodName, Class[] arguments) {
        for (MixinInMetaClass mixin : mixinClasses) {
            final CachedClass mixinClass = mixin.getMixinClass();
            MetaClass metaClass = mixinClass.classInfo.getMetaClassForClass();
            if (metaClass == null) {
                metaClass = GroovySystem.getMetaClassRegistry().getMetaClass(mixinClass.getTheClass());
            }

            MetaMethod metaMethod = metaClass.pickMethod(methodName, arguments);
            if (metaMethod == null && metaClass instanceof MetaClassImpl) {
                MetaClassImpl mc = (MetaClassImpl) metaClass;
                for (CachedClass cl = mc.getTheCachedClass().getCachedSuperClass(); cl != null; cl = cl.getCachedSuperClass()) {
                    metaMethod = mc.getMethodWithoutCaching(cl.getTheClass(), methodName, arguments, false);
                    if (metaMethod != null)
                        break;
                }
            }
            if (metaMethod != null) {
                MetaMethod method = new MixinInstanceMetaMethod(metaMethod, mixin);

                if (method.getParameterTypes().length == 1 && !method.getParameterTypes()[0].isPrimitive) {
                    MetaMethod noParam = pickMethod(methodName, new Class[0]);
                    // if the current call itself is with empty arg class array, no need to recurse with 'new Class[0]'
                    if (noParam == null && arguments.length != 0) {
                        findMixinMethod(methodName, new Class[0]);
                    }
                }

                registerInstanceMethod(method);
                return method;
            }
        }
        return null;
    }

    protected void onInvokeMethodFoundInHierarchy(MetaMethod method) {
        this.invokeMethodMethod = method;
    }

    protected void onSuperMethodFoundInHierarchy(MetaMethod method) {
        addSuperMethodIfNotOverridden(method);
    }

    protected void onSuperPropertyFoundInHierarchy(MetaBeanProperty property) {
        addMetaBeanProperty(property);
    }

    protected void onSetPropertyFoundInHierarchy(MetaMethod method) {
        this.setPropertyMethod = method;
    }

    protected void onGetPropertyFoundInHierarchy(MetaMethod method) {
        this.getPropertyMethod = method;
    }

    public boolean isModified() {
        return this.modified;
    }

    public void registerSubclassInstanceMethod(String name, Class klazz, Closure closure) {
        final List<MetaMethod> list = ClosureMetaMethod.createMethodList(name, klazz, closure);
        for (MetaMethod metaMethod : list) {
            registerSubclassInstanceMethod(metaMethod);
        }
    }

    public void registerSubclassInstanceMethod(MetaMethod metaMethod) {
        modified = true;

        final String name = metaMethod.getName();
        Object methodOrList = expandoSubclassMethods.get(name);
        if (methodOrList == null) {
            expandoSubclassMethods.put(name, metaMethod);
        } else {
            if (methodOrList instanceof MetaMethod) {
                FastArray arr = new FastArray(2);
                arr.add(methodOrList);
                arr.add(metaMethod);
                expandoSubclassMethods.put(name, arr);
            } else {
                ((FastArray) methodOrList).add(metaMethod);
            }
        }
    }

    public void addMixinClass(MixinInMetaClass mixin) {
        mixinClasses.add(mixin);
    }

    public Object castToMixedType(Object obj, Class type) {
        for (MixinInMetaClass mixin : mixinClasses) {
            if (type.isAssignableFrom(mixin.getMixinClass().getTheClass()))
                return mixin.getMixinInstance(obj);
        }
        return null;
    }

    /**
     * For simulating closures in Java
     */
    private interface Callable {
        void call();
    }

    /**
     * Call to enable global use of global use of ExpandoMetaClass within the registry. This has the advantage that
     * inheritance will function correctly, but has a higher memory usage on the JVM than normal Groovy
     */
    public static void enableGlobally() {
        DefaultMetaClassInfo.setWithoutCustomMetaclassCreationHandle(false);
        ExpandoMetaClassCreationHandle.enable();
    }

    /**
     * Call to disable the global use of ExpandoMetaClass
     */
    public static void disableGlobally() {
        DefaultMetaClassInfo.setWithoutCustomMetaclassCreationHandle(true);
        ExpandoMetaClassCreationHandle.disable();
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClassImpl#initialize()
     */

    public synchronized void initialize() {
        if (!isInitialized()) {
            super.initialize();
            setInitialized(true);
            this.initCalled = true;
        }
    }

    /**
     * Checks if the meta class is initialized.
     * @see groovy.lang.MetaClassImpl#isInitialized()
     */
    protected synchronized boolean isInitialized() {
        return this.initialized;
    }

    protected synchronized void setInitialized(boolean b) {
        this.initialized = b;
    }

    private void addSuperMethodIfNotOverridden(final MetaMethod metaMethodFromSuper) {
        performOperationOnMetaClass(new Callable() {
            public void call() {

                MetaMethod existing = null;
                try {
                    existing = pickMethod(metaMethodFromSuper.getName(), metaMethodFromSuper.getNativeParameterTypes());
                } catch ( GroovyRuntimeException e) {
                    // ignore, this happens with overlapping method definitions
                }

                if (existing == null) {
                    addMethodWithKey(metaMethodFromSuper);
                } else {
                    boolean isGroovyMethod = getMetaMethods().contains(existing);

                    if (isGroovyMethod) {
                        addMethodWithKey(metaMethodFromSuper);
                    } else if (inheritedMetaMethods.contains(existing)) {
                        inheritedMetaMethods.remove(existing);
                        addMethodWithKey(metaMethodFromSuper);
                    }
                }
            }

            private void addMethodWithKey(final MetaMethod metaMethodFromSuper) {
                inheritedMetaMethods.add(metaMethodFromSuper);
                if (metaMethodFromSuper instanceof ClosureMetaMethod) {
                    ClosureMetaMethod closureMethod = (ClosureMetaMethod)metaMethodFromSuper;
                    String name = metaMethodFromSuper.getName();
                    final Class declaringClass = metaMethodFromSuper.getDeclaringClass().getTheClass();
                    ClosureMetaMethod localMethod = ClosureMetaMethod.copy(closureMethod);
                    addMetaMethod(localMethod);

                    MethodKey key = new DefaultCachedMethodKey(declaringClass, name, localMethod.getParameterTypes(), false);

                    checkIfGroovyObjectMethod(localMethod);
                    expandoMethods.put(key, localMethod);

                }
            }
        });
    }

    /**
     * Instances of this class are returned when using the << left shift operator.
     * <p/>
     * Example:
     * <p/>
     * metaClass.myMethod << { String args -> }
     * <p/>
     * This allows callbacks to the ExpandoMetaClass for registering appending methods
     *
     * @author Graeme Rocher
     */
    protected class ExpandoMetaProperty extends GroovyObjectSupport {

        protected String propertyName;
        protected boolean isStatic;

        protected ExpandoMetaProperty(String name) {
            this(name, false);
        }

        protected ExpandoMetaProperty(String name, boolean isStatic) {
            this.propertyName = name;
            this.isStatic = isStatic;
        }

        public String getPropertyName() {
            return this.propertyName;
        }

        public boolean isStatic() {
            return this.isStatic;
        }

        public Object leftShift(Object arg) {
            registerIfClosure(arg, false);
            return this;
        }

        private void registerIfClosure(Object arg, boolean replace) {
            if (arg instanceof Closure) {
                Closure callable = (Closure) arg;
                final List<MetaMethod> list = ClosureMetaMethod.createMethodList(propertyName, theClass, callable);
                if (list.isEmpty() && this.isStatic) {
                    Class[] paramTypes = callable.getParameterTypes();
                    registerStatic(callable, replace, paramTypes);
                    return;
                }
                for (MetaMethod method : list) {
                    Class[] paramTypes = method.getNativeParameterTypes();
                    if (this.isStatic) {
                        registerStatic(callable, replace, paramTypes);
                    } else {
                        registerInstance(method, replace, paramTypes);
                    }
                }
            }
        }

        private void registerStatic(Closure callable, boolean replace, Class[] paramTypes) {
            Method foundMethod = checkIfMethodExists(theClass, propertyName, paramTypes, true);
            if (foundMethod != null && !replace)
                throw new GroovyRuntimeException("Cannot add new static method [" + propertyName + "] for arguments [" + DefaultGroovyMethods.inspect(paramTypes) + "]. It already exists!");
            registerStaticMethod(propertyName, callable, paramTypes);
        }

        private void registerInstance(MetaMethod method, boolean replace, Class[] paramTypes) {
            Method foundMethod = checkIfMethodExists(theClass, propertyName, paramTypes, false);
            if (foundMethod != null && !replace)
                throw new GroovyRuntimeException("Cannot add new method [" + propertyName + "] for arguments [" + DefaultGroovyMethods.inspect(paramTypes) + "]. It already exists!");
            registerInstanceMethod(method);
        }

        private Method checkIfMethodExists(Class methodClass, String methodName, Class[] paramTypes, boolean staticMethod) {
            Method foundMethod = null;
            Method[] methods = methodClass.getMethods();
            for (Method method : methods) {
                if (method.getName().equals(methodName) && Modifier.isStatic(method.getModifiers()) == staticMethod) {
                    if (MetaClassHelper.parametersAreCompatible(paramTypes, method.getParameterTypes())) {
                        foundMethod = method;
                        break;
                    }
                }
            }
            return foundMethod;
        }

        /* (non-Javadoc)
           * @see groovy.lang.GroovyObjectSupport#getProperty(java.lang.String)
           */

        public Object getProperty(String property) {
            this.propertyName = property;
            return this;
        }
        /* (non-Javadoc)
           * @see groovy.lang.GroovyObjectSupport#setProperty(java.lang.String, java.lang.Object)
           */

        public void setProperty(String property, Object newValue) {
            this.propertyName = property;
            registerIfClosure(newValue, true);
        }
    }

    /* (non-Javadoc)
      * @see groovy.lang.MetaClassImpl#invokeConstructor(java.lang.Object[])
      */

    public Object invokeConstructor(Object[] arguments) {

        // TODO This is the only area where this MetaClass needs to do some interception because Groovy's current
        // MetaClass uses hard coded references to the java.lang.reflect.Constructor class so you can't simply
        // inject Constructor like you can do properties, methods and fields. When Groovy's MetaClassImpl is
        // refactored we can fix this
        Class[] argClasses = MetaClassHelper.convertToTypeArray(arguments);
        MetaMethod method = pickMethod(GROOVY_CONSTRUCTOR, argClasses);
        if (method != null && method.getParameterTypes().length == arguments.length) {
            return method.invoke(theClass, arguments);
        }
        return super.invokeConstructor(arguments);
    }

    /**
     * Handles the ability to use the left shift operator to append new constructors
     *
     * @author Graeme Rocher
     */
    protected class ExpandoMetaConstructor extends GroovyObjectSupport {
        public Object leftShift(Closure c) {
            if (c != null) {
                final List<MetaMethod> list = ClosureMetaMethod.createMethodList(GROOVY_CONSTRUCTOR, theClass, c);
                for (MetaMethod method : list) {
                    Class[] paramTypes = method.getNativeParameterTypes();
                    Constructor ctor = retrieveConstructor(paramTypes);
                    if (ctor != null)
                        throw new GroovyRuntimeException("Cannot add new constructor for arguments [" + DefaultGroovyMethods.inspect(paramTypes) + "]. It already exists!");

                    registerInstanceMethod(method);
                }
            }

            return this;
        }
    }

    /* (non-Javadoc)
      * @see groovy.lang.GroovyObject#getMetaClass()
      */

    public MetaClass getMetaClass() {
        return myMetaClass;
    }

    /* (non-Javadoc)
      * @see groovy.lang.GroovyObject#getProperty(java.lang.String)
      */

    public Object getProperty(String property) {
        if (isValidExpandoProperty(property)) {
            if (property.equals(STATIC_QUALIFIER)) {
                return new ExpandoMetaProperty(property, true);
            } else if (property.equals(CONSTRUCTOR)) {
                return new ExpandoMetaConstructor();
            } else {
                if (myMetaClass.hasProperty(this, property) == null)
                    return new ExpandoMetaProperty(property);
                else
                    return myMetaClass.getProperty(this, property);
            }
        } else {
            return myMetaClass.getProperty(this, property);
        }
    }

    public static boolean isValidExpandoProperty(String property) {
        return !(property.equals(META_CLASS) || property.equals(CLASS) || property.equals(META_METHODS) || property.equals(METHODS) || property.equals(PROPERTIES));
    }

    /* (non-Javadoc)
      * @see groovy.lang.GroovyObject#invokeMethod(java.lang.String, java.lang.Object)
      */

    public Object invokeMethod(String name, Object args) {
        final Object[] argsArr = args instanceof Object[] ? (Object[]) args : new Object[]{args};
        MetaMethod metaMethod = myMetaClass.getMetaMethod(name, argsArr);
        if (metaMethod != null) {
            // we have to use doMethodInvoke here instead of simply invoke,
            // because getMetaMethod may provide a method that can not be called
            // without further argument transformation, which is done only in 
            // doMethodInvoke
            return metaMethod.doMethodInvoke(this, argsArr);
        }

        if (argsArr.length == 2 && argsArr[0] instanceof Class && argsArr[1] instanceof Closure) {
            if (argsArr[0] == theClass)
                registerInstanceMethod(name, (Closure) argsArr[1]);
            else {
                registerSubclassInstanceMethod(name, (Class) argsArr[0], (Closure) argsArr[1]);
            }
            return null;
        }

        if (argsArr.length == 1 && argsArr[0] instanceof Closure) {
            registerInstanceMethod(name, (Closure) argsArr[0]);
            return null;
        }

        throw new MissingMethodException(name, getClass(), argsArr);
    }

    /* (non-Javadoc)
      * @see groovy.lang.GroovyObject#setMetaClass(groovy.lang.MetaClass)
      */

    public void setMetaClass(MetaClass metaClass) {
        this.myMetaClass = metaClass;
    }

    /* (non-Javadoc)
      * @see groovy.lang.GroovyObject#setProperty(java.lang.String, java.lang.Object)
      */

    public void setProperty(String property, Object newValue) {
        if (newValue instanceof Closure) {
            if (property.equals(CONSTRUCTOR)) {
                property = GROOVY_CONSTRUCTOR;
            }
            Closure callable = (Closure) newValue;
            final List<MetaMethod> list = ClosureMetaMethod.createMethodList(property, theClass, callable);
            for (MetaMethod method : list) {
                // here we don't care if the method exists or not we assume the
                // developer is responsible and wants to override methods where necessary
                registerInstanceMethod(method);
            }
        } else {
            registerBeanProperty(property, newValue);
        }
    }

    public ExpandoMetaClass define(Closure closure) {
        final DefiningClosure definer = new DefiningClosure();
        Object delegate = closure.getDelegate();
        closure.setDelegate(definer);
        closure.setResolveStrategy(Closure.DELEGATE_ONLY);
        closure.call((Object)null);
        closure.setDelegate(delegate);
        closure.setResolveStrategy(Closure.DELEGATE_FIRST);
        definer.definition = false;
        return this;
    }

    protected synchronized void performOperationOnMetaClass(Callable c) {
        try {
            if (allowChangesAfterInit) {
                setInitialized(false);
            }
            c.call();
        }
        finally {
            if (initCalled) {
                setInitialized(true);
            }
        }
    }

    /**
     * Registers a new bean property
     *
     * @param property The property name
     * @param newValue The properties initial value
     */
    public void registerBeanProperty(final String property, final Object newValue) {
        performOperationOnMetaClass(new Callable() {
            public void call() {
                Class type = newValue == null ? Object.class : newValue.getClass();

                MetaBeanProperty mbp = newValue instanceof MetaBeanProperty ? (MetaBeanProperty) newValue : new ThreadManagedMetaBeanProperty(theClass, property, type, newValue);

                final MetaMethod getter = mbp.getGetter();
                final MethodKey getterKey = new DefaultCachedMethodKey(theClass, getter.getName(), CachedClass.EMPTY_ARRAY, false);
                final MetaMethod setter = mbp.getSetter();
                final MethodKey setterKey = new DefaultCachedMethodKey(theClass, setter.getName(), setter.getParameterTypes(), false);
                addMetaMethod(getter);
                addMetaMethod(setter);

                expandoMethods.put(setterKey, setter);
                expandoMethods.put(getterKey, getter);
                expandoProperties.put(mbp.getName(), mbp);

                addMetaBeanProperty(mbp);
                performRegistryCallbacks();
            }

        });
    }

    /**
     * Registers a new instance method for the given method name and closure on this MetaClass
     *
     * @param metaMethod
     */
    public void registerInstanceMethod(final MetaMethod metaMethod) {
        final boolean inited = this.initCalled;
        performOperationOnMetaClass(new Callable() {
            public void call() {
                String methodName = metaMethod.getName();
                checkIfGroovyObjectMethod(metaMethod);
                MethodKey key = new DefaultCachedMethodKey(theClass, methodName, metaMethod.getParameterTypes(), false);

                if (isInitialized()) {
                    throw new RuntimeException("Already initialized, cannot add new method: " + metaMethod);
                }
                // we always adds meta methods to class itself
                addMetaMethodToIndex(metaMethod, metaMethodIndex.getHeader(theClass));

                dropMethodCache(methodName);
                expandoMethods.put(key, metaMethod);

                if (inited && isGetter(methodName, metaMethod.getParameterTypes())) {
                    String propertyName = getPropertyForGetter(methodName);
                    registerBeanPropertyForMethod(metaMethod, propertyName, true, false);

                } else if (inited && isSetter(methodName, metaMethod.getParameterTypes())) {
                    String propertyName = getPropertyForSetter(methodName);
                    registerBeanPropertyForMethod(metaMethod, propertyName, false, false);
                }
                performRegistryCallbacks();
            }

        });
    }

    public void registerInstanceMethod(String name, Closure closure) {
        final List<MetaMethod> list = ClosureMetaMethod.createMethodList(name, theClass, closure);
        for (MetaMethod method : list) {
            registerInstanceMethod(method);
        }
    }

    /**
     * Overrides the behavior of parent getMethods() method to make MetaClass aware of added Expando methods
     *
     * @return A list of MetaMethods
     * @see MetaObjectProtocol#getMethods()
     */
    public List<MetaMethod> getMethods() {
        List<MetaMethod> methodList = new ArrayList();
        methodList.addAll(this.expandoMethods.values());
        methodList.addAll(super.getMethods());
        return methodList;
    }

    public List<MetaProperty> getProperties() {
        List<MetaProperty> propertyList = new ArrayList();
        propertyList.addAll(super.getProperties());
        return propertyList;
    }


    private void performRegistryCallbacks() {
        MetaClassRegistry registry = GroovySystem.getMetaClassRegistry();
        incVersion();
        if (!modified) {
            modified = true;
            // Implementation note: By default Groovy uses soft references to store MetaClass
            // this insures the registry doesn't grow and get out of hand. By doing this we're
            // saying this this EMC will be a hard reference in the registry. As we're only
            // going have a small number of classes that have modified EMC this is ok
            if (inRegistry) {
                MetaClass currMetaClass = registry.getMetaClass(theClass);
                if (!(currMetaClass instanceof ExpandoMetaClass) && currMetaClass instanceof AdaptingMetaClass) {
                    ((AdaptingMetaClass) currMetaClass).setAdaptee(this);
                } else {
                    registry.setMetaClass(theClass, this);
                }
            }

        }
    }

    private void registerBeanPropertyForMethod(MetaMethod metaMethod, String propertyName, boolean getter, boolean isStatic) {
        Map<String, MetaProperty> propertyCache = isStatic ? staticBeanPropertyCache : beanPropertyCache;
        MetaBeanProperty beanProperty = (MetaBeanProperty) propertyCache.get(propertyName);
        if (beanProperty == null) {
            if (getter)
                beanProperty = new MetaBeanProperty(propertyName, Object.class, metaMethod, null);
            else
                beanProperty = new MetaBeanProperty(propertyName, Object.class, null, metaMethod);

            propertyCache.put(propertyName, beanProperty);
        } else {
            if (getter) {
                MetaMethod setterMethod = beanProperty.getSetter();
                Class type = setterMethod != null ? setterMethod.getParameterTypes()[0].getTheClass() : Object.class;
                beanProperty = new MetaBeanProperty(propertyName, type, metaMethod, setterMethod);
                propertyCache.put(propertyName, beanProperty);
            } else {
                MetaMethod getterMethod = beanProperty.getGetter();
                beanProperty = new MetaBeanProperty(propertyName, metaMethod.getParameterTypes()[0].getTheClass(), getterMethod, metaMethod);
                propertyCache.put(propertyName, beanProperty);
            }
        }
        expandoProperties.put(beanProperty.getName(), beanProperty);
        addMetaBeanProperty(beanProperty);
    }

    protected void registerStaticMethod(final String name, final Closure callable) {
        registerStaticMethod(name, callable, null);
    }

    /**
     * Registers a new static method for the given method name and closure on this MetaClass
     *
     * @param name     The method name
     * @param callable The callable Closure
     */
    protected void registerStaticMethod(final String name, final Closure callable, final Class[] paramTypes) {
        performOperationOnMetaClass(new Callable() {
            public void call() {
                String methodName;
                if (name.equals(METHOD_MISSING))
                    methodName = STATIC_METHOD_MISSING;
                else if (name.equals(PROPERTY_MISSING))
                    methodName = STATIC_PROPERTY_MISSING;
                else
                    methodName = name;

                ClosureStaticMetaMethod metaMethod = null;

                if (paramTypes != null) {
                    metaMethod = new ClosureStaticMetaMethod(methodName, theClass, callable, paramTypes);
                } else {
                    metaMethod = new ClosureStaticMetaMethod(methodName, theClass, callable);
                }

                if (methodName.equals(INVOKE_METHOD_METHOD) && callable.getParameterTypes().length == 2) {
                    invokeStaticMethodMethod = metaMethod;
                } else {
                    if (methodName.equals(METHOD_MISSING)) {
                        methodName = STATIC_METHOD_MISSING;
                    }
                    MethodKey key = new DefaultCachedMethodKey(theClass, methodName, metaMethod.getParameterTypes(), false);

                    addMetaMethod(metaMethod);
                    dropStaticMethodCache(methodName);
//                    cacheStaticMethod(key,metaMethod);

                    if (isGetter(methodName, metaMethod.getParameterTypes())) {
                        String propertyName = getPropertyForGetter(methodName);
                        registerBeanPropertyForMethod(metaMethod, propertyName, true, true);

                    } else if (isSetter(methodName, metaMethod.getParameterTypes())) {
                        String propertyName = getPropertyForSetter(methodName);
                        registerBeanPropertyForMethod(metaMethod, propertyName, false, true);
                    }
                    performRegistryCallbacks();
                    expandoMethods.put(key, metaMethod);
                }
            }

        });
    }

    protected Object getSubclassMetaMethods(String methodName) {
        if (!isModified())
            return null;

        return expandoSubclassMethods.get(methodName);
    }

    /**
     * @return The Java class enhanced by this MetaClass
     */
    public Class getJavaClass() {
        return theClass;
    }

    /**
     * Called from ExpandoMetaClassCreationHandle in the registry if it exists to
     * set up inheritance handling
     *
     * @param modifiedSuperExpandos A list of modified super ExpandoMetaClass
     */
    public void refreshInheritedMethods(Set modifiedSuperExpandos) {
        for (Iterator i = modifiedSuperExpandos.iterator(); i.hasNext();) {
            ExpandoMetaClass superExpando = (ExpandoMetaClass) i.next();
            if (superExpando != this) {
                refreshInheritedMethods(superExpando);
            }
        }
    }

    private void refreshInheritedMethods(ExpandoMetaClass superExpando) {
        List<MetaMethod> metaMethods = superExpando.getExpandoMethods();
        for (MetaMethod metaMethod : metaMethods) {
            if (metaMethod.isStatic()) {
                if (superExpando.getTheClass() != getTheClass())
                    continue; // don't inherit static methods except our own
                registerStaticMethod(metaMethod.getName(), (Closure) ((ClosureStaticMetaMethod) metaMethod).getClosure().clone());
            } else
                addSuperMethodIfNotOverridden(metaMethod);
        }
        Collection<MetaProperty> metaProperties = superExpando.getExpandoProperties();
        for (Object metaProperty : metaProperties) {
            MetaBeanProperty property = (MetaBeanProperty) metaProperty;
            expandoProperties.put(property.getName(), property);
            addMetaBeanProperty(property);
        }
    }


    /**
     * Returns a list of expando MetaMethod instances added to this ExpandoMetaClass
     *
     * @return the expandoMethods
     */
    public List<MetaMethod> getExpandoMethods() {
        return Collections.unmodifiableList(DefaultGroovyMethods.toList(expandoMethods.values()));
    }


    /**
     * Returns a list of MetaBeanProperty instances added to this ExpandoMetaClass
     *
     * @return the expandoProperties
     */
    public Collection<MetaProperty> getExpandoProperties() {
        return Collections.unmodifiableCollection(expandoProperties.values());
    }

    /**
     * Overrides default implementation just in case invokeMethod has been overridden by ExpandoMetaClass
     *
     * @see groovy.lang.MetaClassImpl#invokeMethod(Class, Object, String, Object[], boolean, boolean)
     */
    public Object invokeMethod(Class sender, Object object, String methodName, Object[] originalArguments, boolean isCallToSuper, boolean fromInsideClass) {
        if (invokeMethodMethod != null) {
            return invokeMethodMethod.invoke(object, new Object[]{methodName, originalArguments});
        }
        return super.invokeMethod(sender, object, methodName, originalArguments, isCallToSuper, fromInsideClass);
    }

    /**
     * Overrides default implementation just in case a static invoke method has been set on ExpandoMetaClass
     *
     * @see MetaClassImpl#invokeStaticMethod(Object, String, Object[])
     */
    public Object invokeStaticMethod(Object object, String methodName, Object[] arguments) {
        if (invokeStaticMethodMethod != null) {
            return invokeStaticMethodMethod.invoke(object, new Object[]{methodName, arguments});
        }
        return super.invokeStaticMethod(object, methodName, arguments);
    }

    /**
     * Overrides default implementation just in case getProperty method has been overridden by ExpandoMetaClass
     *
     * @see MetaClassImpl#getProperty(Class, Object, String, boolean, boolean)
     */
    public Object getProperty(Class sender, Object object, String name, boolean useSuper, boolean fromInsideClass) {
        if (hasOverrideGetProperty(name) && getJavaClass().isInstance(object)) {
            return getPropertyMethod.invoke(object, new Object[]{name});
        }

        if ("mixedIn".equals(name)) {
            return new MixedInAccessor(object, mixinClasses);
        }

        return super.getProperty(sender, object, name, useSuper, fromInsideClass);
    }

    /**
     * Overrides default implementation just in case getProperty method has been overridden by ExpandoMetaClass
     *
     * @see MetaClassImpl#getProperty(Object, String)
     */
    public Object getProperty(Object object, String name) {
        if (hasOverrideGetProperty(name) && getJavaClass().isInstance(object)) {
            return getPropertyMethod.invoke(object, new Object[]{name});
        }
        return super.getProperty(object, name);
    }

    private boolean hasOverrideGetProperty(String name) {
        return getPropertyMethod != null && !name.equals(META_CLASS_PROPERTY) && !name.equals(CLASS_PROPERTY);
    }

    /**
     * Overrides default implementation just in case setProperty method has been overridden by ExpandoMetaClass
     *
     * @see MetaClassImpl#setProperty(Class, Object, String, Object, boolean, boolean)
     */

    public void setProperty(Class sender, Object object, String name, Object newValue, boolean useSuper, boolean fromInsideClass) {
        if (setPropertyMethod != null && !name.equals(META_CLASS_PROPERTY) && getJavaClass().isInstance(object)) {
            setPropertyMethod.invoke(object, new Object[]{name, newValue});
            return;
        }
        super.setProperty(sender, object, name, newValue, useSuper, fromInsideClass);
    }

    /**
     * Looks up an existing MetaProperty by name
     *
     * @param name The name of the MetaProperty
     * @return The MetaProperty or null if it doesn't exist
     */
    public MetaProperty getMetaProperty(String name) {
        MetaProperty mp = (MetaProperty) this.expandoProperties.get(name);
        if (mp != null) return mp;
        return super.getMetaProperty(name);
    }

    /**
     * Returns true if the MetaClass has the given property
     *
     * @param name The name of the MetaProperty
     * @return True it exists as a MetaProperty
     */
    public boolean hasMetaProperty(String name) {
        return getMetaProperty(name) != null;
    }

    /**
     * Checks whether a MetaMethod for the given name and arguments exists
     *
     * @param name The name of the MetaMethod
     * @param args The arguments to the meta method
     * @return True if the method exists otherwise null
     */
    public boolean hasMetaMethod(String name, Class[] args) {
        return super.pickMethod(name, args) != null;
    }

    /**
     * Determine if this method name suffix is a legitimate bean property name.
     * Either the first or second letter must be upperCase for that to be true.
     */
    private static boolean isPropertyName(String name) {
        return ((name.length() > 0) && Character.isUpperCase(name.charAt(0))) || ((name.length() > 1) && Character.isUpperCase(name.charAt(1)));
    }

    /**
     * Returns true if the name of the method specified and the number of arguments make it a javabean property
     *
     * @param name True if its a Javabean property
     * @param args The arguments
     * @return True if it is a javabean property method
     */
    private boolean isGetter(String name, CachedClass[] args) {
        if (name == null || name.length() == 0 || args == null) return false;
        if (args.length != 0) return false;

        if (name.startsWith("get")) {
            name = name.substring(3);
            return isPropertyName(name);
        } else if (name.startsWith("is")) {
            name = name.substring(2);
            return isPropertyName(name);
        }
        return false;
    }

    /**
     * Returns a property name equivalent for the given getter name or null if it is not a getter
     *
     * @param getterName The getter name
     * @return The property name equivalent
     */
    private String getPropertyForGetter(String getterName) {
        if (getterName == null || getterName.length() == 0) return null;

        if (getterName.startsWith("get")) {
            String prop = getterName.substring(3);
            return convertPropertyName(prop);
        } else if (getterName.startsWith("is")) {
            String prop = getterName.substring(2);
            return convertPropertyName(prop);
        }
        return null;
    }

    private String convertPropertyName(String prop) {
        if (Character.isDigit(prop.charAt(0))) {
            return prop;
        }
        return java.beans.Introspector.decapitalize(prop);
    }

    /**
     * Returns a property name equivalent for the given setter name or null if it is not a getter
     *
     * @param setterName The setter name
     * @return The property name equivalent
     */
    public String getPropertyForSetter(String setterName) {
        if (setterName == null || setterName.length() == 0) return null;

        if (setterName.startsWith("set")) {
            String prop = setterName.substring(3);
            return convertPropertyName(prop);
        }
        return null;
    }

    public boolean isSetter(String name, CachedClass[] args) {
        if (name == null || name.length() == 0 || args == null) return false;

        if (name.startsWith("set")) {
            if (args.length != 1) return false;
            name = name.substring(3);
            return isPropertyName(name);
        }

        return false;
    }

    public CallSite createPojoCallSite(CallSite site, Object receiver, Object[] args) {
        if (invokeMethodMethod != null)
            return new PojoMetaClassSite(site, this);

        return super.createPojoCallSite(site, receiver, args);
    }

    public CallSite createStaticSite(CallSite site, Object[] args) {
        if (invokeStaticMethodMethod != null)
            return new StaticMetaClassSite(site, this);

        return super.createStaticSite(site, args);
    }

    public CallSite createPogoCallSite(CallSite site, Object[] args) {
        if (invokeMethodMethod != null)
            return new PogoMetaClassSite(site, this);
        return super.createPogoCallSite(site, args);
    }

    public CallSite createPogoCallCurrentSite(CallSite site, Class sender, String name, Object[] args) {
        if (invokeMethodMethod != null)
            return new PogoMetaClassSite(site, this);
        return super.createPogoCallCurrentSite(site, sender, args);
    }

    public CallSite createConstructorSite(CallSite site, Object[] args) {
        Class[] params = MetaClassHelper.convertToTypeArray(args);
        MetaMethod method = pickMethod(GROOVY_CONSTRUCTOR, params);
        if (method != null && method.getParameterTypes().length == args.length) {
            if (method.getDeclaringClass().getTheClass().equals(getTheClass())) {
                return new ConstructorMetaMethodSite(site, this, method, params);
            }
        }

        return super.createConstructorSite(site, args);
    }

    private class SubClassDefiningClosure extends GroovyObjectSupport {
        private final Class klazz;

        public SubClassDefiningClosure(Class klazz) {
            this.klazz = klazz;
        }

        public Object invokeMethod(String name, Object obj) {
            if (obj instanceof Object[]) {
                Object args[] = (Object[]) obj;
                if (args.length == 1 && args[0] instanceof Closure) {
                    registerSubclassInstanceMethod(name, klazz, (Closure) args[0]);
                    return null;
                }
            }

            throw new MissingMethodException(name, getClass(), new Object[]{obj});
        }
    }

    private class DefiningClosure extends GroovyObjectSupport {
        boolean definition = true;

        public void mixin(Class category) {
            mixin(Collections.singletonList(category));
        }

        public void mixin(List categories) {
            DefaultGroovyMethods.mixin(ExpandoMetaClass.this, categories);
        }

        public void mixin(Class[] categories) {
            DefaultGroovyMethods.mixin(ExpandoMetaClass.this, categories);
        }

        public void define(Class subClass, Closure closure) {
            final SubClassDefiningClosure definer = new SubClassDefiningClosure(subClass);
            closure.setDelegate(definer);
            closure.setResolveStrategy(Closure.DELEGATE_FIRST);
            closure.call((Object)null);
        }

        public Object invokeMethod(String name, Object obj) {
            try {
                return getMetaClass().invokeMethod(this, name, obj);
            }
            catch (MissingMethodException mme) {
                if (obj instanceof Object[]) {
                    if (STATIC_QUALIFIER.equals(name)) {
                        final StaticDefiningClosure staticDef = new StaticDefiningClosure();
                        Closure c = (Closure) ((Object[]) obj)[0];
                        c.setDelegate(staticDef);
                        c.setResolveStrategy(Closure.DELEGATE_ONLY);
                        c.call((Object)null);
                        return null;
                    }
                    Object args[] = (Object[]) obj;
                    if (args.length == 1 && args[0] instanceof Closure) {
                        registerInstanceMethod(name, (Closure) args[0]);
                    } else if (args.length == 2 && args[0] instanceof Class && args[1] instanceof Closure)
                        registerSubclassInstanceMethod(name, (Class) args[0], (Closure) args[1]);
                    else
                        ExpandoMetaClass.this.setProperty(name, ((Object[]) obj)[0]);

                    return null;
                }

                throw mme;
            }
        }

        public void setProperty(String property, Object newValue) {
            ExpandoMetaClass.this.setProperty(property, newValue);
        }

        public Object getProperty(String property) {
            if (STATIC_QUALIFIER.equals(property))
                return new StaticDefiningClosure();

            if (definition)
                return new ExpandoMetaProperty(property);
            else
                throw new MissingPropertyException(property, getClass());
        }
    }

    private class StaticDefiningClosure extends ExpandoMetaProperty {
        protected StaticDefiningClosure() {
            super(STATIC_QUALIFIER, true);
        }

        public Object invokeMethod(String name, Object obj) {
            if (obj instanceof Object[]) {
                final Object[] args = (Object[]) obj;
                if (args.length == 1 && args[0] instanceof Closure) {
                    registerStaticMethod(name, (Closure) args[0]);
                    return null;
                }
            }

            throw new MissingMethodException(name, getClass(), obj instanceof Object[] ? (Object[]) obj : new Object[]{obj});
        }
    }

    private static class MixedInAccessor {
        private final Object object;
        private final Set<MixinInMetaClass> mixinClasses;

        public MixedInAccessor(Object object, Set<MixinInMetaClass> mixinClasses) {
            this.object = object;
            this.mixinClasses = mixinClasses;
        }

        public Object getAt(Class key) {
            if (key.isAssignableFrom(object.getClass())) {
                return new GroovyObjectSupport() {
                    {
                        final MetaClass ownMetaClass = InvokerHelper.getMetaClass(object.getClass());
                        setMetaClass(new OwnedMetaClass(ownMetaClass) {
                            protected Object getOwner() {
                                return object;
                            }

                            protected MetaClass getOwnerMetaClass(Object owner) {
                                return getAdaptee();
                            }
                        });
                    }
                };
            }

            for (final MixinInMetaClass mixin : mixinClasses) {
                if (key.isAssignableFrom(mixin.getMixinClass().getTheClass())) {
                    return new GroovyObjectSupport() {
                        {
                            final Object mixedInInstance = mixin.getMixinInstance(object);
                            setMetaClass(new OwnedMetaClass(InvokerHelper.getMetaClass(mixedInInstance)) {
                                @Override
                                protected Object getOwner() {
                                    return mixedInInstance;
                                }

                                @Override
                                protected MetaClass getOwnerMetaClass(Object owner) {
                                    return ((MixedInMetaClass) getAdaptee()).getAdaptee();
                                }
                            });
                        }
                    };
                }
            }

            throw new RuntimeException("Class " + key + " isn't mixed in " + object.getClass());
        }

        public void putAt(Class key, Object value) {
            for (MixinInMetaClass mixin : mixinClasses)
                if (mixin.getMixinClass().getTheClass() == key) {
                    mixin.setMixinInstance(object, value);
                    return;
                }

            throw new RuntimeException("Class " + key + " isn't mixed in " + object.getClass());
        }
    }
}

Other Groovy examples (source code examples)

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All Rights Reserved.