Groovy example source code file (DelegatingMetaClass.java)

This example Groovy source code file (DelegatingMetaClass.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, delegatingmetaclass, groovyobject, groovyobject, list, metaclass, metamethod, missingpropertyexception, mutablemetaclass, mutablemetaclass, object, object, reflection, string, string, util

The Groovy DelegatingMetaClass.java source code

/*
 * Copyright 2003-2009 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.ast.ClassNode;
import org.codehaus.groovy.runtime.InvokerHelper;

import java.lang.reflect.Method;
import java.util.List;

/**
 * @author John Wilson
 */

public class DelegatingMetaClass implements MetaClass, MutableMetaClass, GroovyObject {
    protected MetaClass delegate;

    public DelegatingMetaClass(final MetaClass delegate) {
        this.delegate = delegate;
    }

    public DelegatingMetaClass(final Class theClass) {
        this(GroovySystem.getMetaClassRegistry().getMetaClass(theClass));
    }

    public boolean isModified() {
        return this.delegate instanceof MutableMetaClass && ((MutableMetaClass) this.delegate).isModified();
    }

    /* (non-Javadoc)
    * @see groovy.lang.MetaClass#addNewInstanceMethod(java.lang.reflect.Method)
    */
    public void addNewInstanceMethod(Method method) {
        if (delegate instanceof MutableMetaClass)
            ((MutableMetaClass) delegate).addNewInstanceMethod(method);
    }

    /* (non-Javadoc)
    * @see groovy.lang.MetaClass#addNewStaticMethod(java.lang.reflect.Method)
    */
    public void addNewStaticMethod(Method method) {
        if (delegate instanceof MutableMetaClass)
            ((MutableMetaClass) delegate).addNewStaticMethod(method);
    }

    public void addMetaMethod(MetaMethod metaMethod) {
        if (delegate instanceof MutableMetaClass)
            ((MutableMetaClass) delegate).addMetaMethod(metaMethod);
    }

    public void addMetaBeanProperty(MetaBeanProperty metaBeanProperty) {
        if (delegate instanceof MutableMetaClass)
            ((MutableMetaClass) delegate).addMetaBeanProperty(metaBeanProperty);
    }

    /* (non-Javadoc)
    * @see groovy.lang.MetaClass#initialize()
    */
    public void initialize() {
        delegate.initialize();
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#getAttribute(java.lang.Object, java.lang.String)
     */
    public Object getAttribute(Object object, String attribute) {
        return delegate.getAttribute(object, attribute);
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#getClassNode()
     */
    public ClassNode getClassNode() {
        return delegate.getClassNode();
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#getMetaMethods()
     */
    public List<MetaMethod> getMetaMethods() {
        return delegate.getMetaMethods();
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#getMethods()
     */
    public List<MetaMethod> getMethods() {
        return delegate.getMethods();
    }

    public List<MetaMethod> respondsTo(Object obj, String name, Object[] argTypes) {
        return delegate.respondsTo(obj, name, argTypes);
    }

    public List<MetaMethod> respondsTo(Object obj, String name) {
        return delegate.respondsTo(obj, name);
    }

    public MetaProperty hasProperty(Object obj, String name) {
        return delegate.hasProperty(obj, name);
    }

    /* (non-Javadoc)
    * @see groovy.lang.MetaClass#getProperties()
    */
    public List<MetaProperty> getProperties() {
        return delegate.getProperties();
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#getProperty(java.lang.Object, java.lang.String)
     */
    public Object getProperty(Object object, String property) {
        return delegate.getProperty(object, property);
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#invokeConstructor(java.lang.Object[])
     */
    public Object invokeConstructor(Object[] arguments) {
        return delegate.invokeConstructor(arguments);
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#invokeMethod(java.lang.Object, java.lang.String, java.lang.Object)
     */
    public Object invokeMethod(Object object, String methodName, Object arguments) {
        return delegate.invokeMethod(object, methodName, arguments);
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#invokeMethod(java.lang.Object, java.lang.String, java.lang.Object[])
     */
    public Object invokeMethod(Object object, String methodName, Object[] arguments) {
        return delegate.invokeMethod(object, methodName, arguments);
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#invokeStaticMethod(java.lang.Object, java.lang.String, java.lang.Object[])
     */
    public Object invokeStaticMethod(Object object, String methodName, Object[] arguments) {
        return delegate.invokeStaticMethod(object, methodName, arguments);
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#setAttribute(java.lang.Object, java.lang.String, java.lang.Object)
     */
    public void setAttribute(Object object, String attribute, Object newValue) {
        delegate.setAttribute(object, attribute, newValue);
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#setProperty(java.lang.Object, java.lang.String, java.lang.Object)
     */
    public void setProperty(Object object, String property, Object newValue) {
        delegate.setProperty(object, property, newValue);
    }

    /* (non-Javadoc)
     * @see java.lang.Object#equals(java.lang.Object)
     */
    public boolean equals(Object obj) {
        return delegate.equals(obj);
    }

    /* (non-Javadoc)
     * @see java.lang.Object#hashCode()
     */
    public int hashCode() {
        return delegate.hashCode();
    }

    public String toString() {
        return super.toString() + "[" + delegate.toString() + "]";
    }

    /**
     * @deprecated
     */
    public MetaMethod pickMethod(String methodName, Class[] arguments) {
        return delegate.pickMethod(methodName, arguments);
    }

    public Object getAttribute(Class sender, Object receiver, String messageName, boolean useSuper) {
        return this.delegate.getAttribute(sender, receiver, messageName, useSuper);
    }

    public Object getProperty(Class sender, Object receiver, String messageName, boolean useSuper, boolean fromInsideClass) {
        return this.delegate.getProperty(sender, receiver, messageName, useSuper, fromInsideClass);
    }

    public MetaProperty getMetaProperty(String name) {
        return this.delegate.getMetaProperty(name);
    }

    public MetaMethod getStaticMetaMethod(String name, Object[] args) {
        return this.delegate.getStaticMetaMethod(name, args);
    }

    public MetaMethod getStaticMetaMethod(String name, Class[] argTypes) {
        return this.delegate.getStaticMetaMethod(name, argTypes);
    }

    public MetaMethod getMetaMethod(String name, Object[] args) {
        return this.delegate.getMetaMethod(name, args);
    }

    public Class getTheClass() {
        return this.delegate.getTheClass();
    }

    public Object invokeMethod(Class sender, Object receiver, String methodName, Object[] arguments, boolean isCallToSuper, boolean fromInsideClass) {
        return this.delegate.invokeMethod(sender, receiver, methodName, arguments, isCallToSuper, fromInsideClass);
    }

    public Object invokeMissingMethod(Object instance, String methodName, Object[] arguments) {
        return this.delegate.invokeMissingMethod(instance, methodName, arguments);
    }

    public Object invokeMissingProperty(Object instance, String propertyName, Object optionalValue, boolean isGetter) {
        return this.delegate.invokeMissingProperty(instance, propertyName, optionalValue, isGetter);
    }

    public boolean isGroovyObject() {
        return GroovyObject.class.isAssignableFrom(this.delegate.getTheClass());
    }

    public void setAttribute(Class sender, Object receiver, String messageName, Object messageValue, boolean useSuper, boolean fromInsideClass) {
        this.delegate.setAttribute(sender, receiver, messageName, messageValue, useSuper, fromInsideClass);
    }

    public void setProperty(Class sender, Object receiver, String messageName, Object messageValue, boolean useSuper, boolean fromInsideClass) {
        this.delegate.setProperty(sender, receiver, messageName, messageValue, useSuper, fromInsideClass);
    }

    public int selectConstructorAndTransformArguments(int numberOfConstructors, Object[] arguments) {
        return this.delegate.selectConstructorAndTransformArguments(numberOfConstructors, arguments);
    }

    public void setAdaptee(MetaClass adaptee) {
        this.delegate = adaptee;
    }

    public MetaClass getAdaptee() {
        return this.delegate;
    }

    public Object invokeMethod(String name, Object args) {
        try {
            return getMetaClass().invokeMethod(this, name, args);
        }
        catch (MissingMethodException e) {
            if (delegate instanceof GroovyObject)
                return ((GroovyObject) delegate).invokeMethod(name, args);
            else
                throw e;
        }
    }

    public Object getProperty(String property) {
        try {
            return getMetaClass().getProperty(this, property);
        }
        catch (MissingPropertyException e) {
            if (delegate instanceof GroovyObject)
                return ((GroovyObject) delegate).getProperty(property);
            else
                throw e;
        }
    }

    public void setProperty(String property, Object newValue) {
        try {
            getMetaClass().setProperty(this, property, newValue);
        }
        catch (MissingPropertyException e) {
            if (delegate instanceof GroovyObject)
                ((GroovyObject) delegate).setProperty(property, newValue);
            else
                throw e;
        }
    }

    public MetaClass getMetaClass() {
        return InvokerHelper.getMetaClass(getClass());
    }

    public void setMetaClass(MetaClass metaClass) {
        throw new UnsupportedOperationException();
    }
}