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Groovy example source code file (InvokerHelper.java)

This example Groovy source code file (InvokerHelper.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

arraylist, bean, class, dom, empty_args, groovyobject, groovyobject, javabean, list, map, map, math, metaclass, object, object, regex, string, string, stringbuffer, util

The Groovy InvokerHelper.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 org.codehaus.groovy.runtime;

import groovy.lang.*;
import groovy.xml.XmlUtil;
import org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl;
import org.codehaus.groovy.runtime.metaclass.MissingMethodExecutionFailed;
import org.codehaus.groovy.runtime.powerassert.PowerAssertionError;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
import org.codehaus.groovy.runtime.wrappers.PojoWrapper;
import org.codehaus.groovy.util.ReleaseInfo;
import org.w3c.dom.Element;

import java.beans.Introspector;
import java.io.*;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * A static helper class to make bytecode generation easier and act as a facade over the Invoker
 *
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 22336 $
 */
public class InvokerHelper {
    private static final Object[] EMPTY_MAIN_ARGS = new Object[]{new String[0]};

    public static final Object[] EMPTY_ARGS = {};
    protected static final Object[] EMPTY_ARGUMENTS = EMPTY_ARGS;
    protected static final Class[] EMPTY_TYPES = {};

    public static final MetaClassRegistry metaRegistry = GroovySystem.getMetaClassRegistry();

    public static void removeClass(Class clazz) {
        metaRegistry.removeMetaClass(clazz);
        Introspector.flushFromCaches(clazz);
    }

    public static Object invokeMethodSafe(Object object, String methodName, Object arguments) {
        if (object != null) {
            return invokeMethod(object, methodName, arguments);
        }
        return null;
    }

    public static Object invokeStaticMethod(String klass, String methodName, Object arguments) throws ClassNotFoundException {
        Class type = Class.forName(klass);
        return invokeStaticMethod(type, methodName, arguments);
    }


    public static Object invokeStaticNoArgumentsMethod(Class type, String methodName) {
        return invokeStaticMethod(type, methodName, EMPTY_ARGS);
    }

    public static Object invokeConstructorOf(String klass, Object arguments) throws ClassNotFoundException {
        Class type = Class.forName(klass);
        return invokeConstructorOf(type, arguments);
    }

    public static Object invokeNoArgumentsConstructorOf(Class type) {
        return invokeConstructorOf(type, EMPTY_ARGS);
    }

    public static Object invokeClosure(Object closure, Object arguments) {
        return invokeMethod(closure, "doCall", arguments);
    }

    public static List asList(Object value) {
        if (value == null) {
            return Collections.EMPTY_LIST;
        }
        if (value instanceof List) {
            return (List) value;
        }
        if (value.getClass().isArray()) {
            return Arrays.asList((Object[]) value);
        }
        if (value instanceof Enumeration) {
            List answer = new ArrayList();
            for (Enumeration e = (Enumeration) value; e.hasMoreElements();) {
                answer.add(e.nextElement());
            }
            return answer;
        }
        // lets assume its a collection of 1
        return Collections.singletonList(value);
    }

    public static String toString(Object arguments) {
        if (arguments instanceof Object[])
            return toArrayString((Object[]) arguments);
        if (arguments instanceof Collection)
            return toListString((Collection) arguments);
        if (arguments instanceof Map)
            return toMapString((Map) arguments);
        return format(arguments, false);
    }

    public static String inspect(Object self) {
        return format(self, true);
    }

    public static Object getAttribute(Object object, String attribute) {
        if (object == null) {
            object = NullObject.getNullObject();
        }

        if (object instanceof Class) {
            return metaRegistry.getMetaClass((Class) object).getAttribute(object, attribute);
        } else if (object instanceof GroovyObject) {
            return ((GroovyObject) object).getMetaClass().getAttribute(object, attribute);
        } else {
            return metaRegistry.getMetaClass(object.getClass()).getAttribute(object, attribute);
        }
    }

    public static void setAttribute(Object object, String attribute, Object newValue) {
        if (object == null) {
            object = NullObject.getNullObject();
        }

        if (object instanceof Class) {
            metaRegistry.getMetaClass((Class) object).setAttribute(object, attribute, newValue);
        } else if (object instanceof GroovyObject) {
            ((GroovyObject) object).getMetaClass().setAttribute(object, attribute, newValue);
        } else {
            metaRegistry.getMetaClass(object.getClass()).setAttribute(object, attribute, newValue);
        }
    }

    public static Object getProperty(Object object, String property) {
        if (object == null) {
            object = NullObject.getNullObject();
        }

        if (object instanceof GroovyObject) {
            GroovyObject pogo = (GroovyObject) object;
            return pogo.getProperty(property);
        } else if (object instanceof Class) {
            Class c = (Class) object;
            return metaRegistry.getMetaClass(c).getProperty(object, property);
        } else {
            return ((MetaClassRegistryImpl) metaRegistry).getMetaClass(object).getProperty(object, property);
        }
    }

    public static Object getPropertySafe(Object object, String property) {
        if (object != null) {
            return getProperty(object, property);
        }
        return null;
    }

    public static void setProperty(Object object, String property, Object newValue) {
        if (object == null) {
            object = NullObject.getNullObject();
        }

        if (object instanceof GroovyObject) {
            GroovyObject pogo = (GroovyObject) object;
            pogo.setProperty(property, newValue);
        } else if (object instanceof Class) {
            metaRegistry.getMetaClass((Class) object).setProperty((Class) object, property, newValue);
        } else {
            ((MetaClassRegistryImpl) GroovySystem.getMetaClassRegistry()).getMetaClass(object).setProperty(object, property, newValue);
        }
    }

    /**
     * This is so we don't have to reorder the stack when we call this method.
     * At some point a better name might be in order.
     */
    public static void setProperty2(Object newValue, Object object, String property) {
        setProperty(object, property, newValue);
    }


    /**
     * This is so we don't have to reorder the stack when we call this method.
     * At some point a better name might be in order.
     */
    public static void setGroovyObjectProperty(Object newValue, GroovyObject object, String property) {
        object.setProperty(property, newValue);
    }

    public static Object getGroovyObjectProperty(GroovyObject object, String property) {
        return object.getProperty(property);
    }


    /**
     * This is so we don't have to reorder the stack when we call this method.
     * At some point a better name might be in order.
     */
    public static void setPropertySafe2(Object newValue, Object object, String property) {
        if (object != null) {
            setProperty2(newValue, object, property);
        }
    }

    /**
     * Returns the method pointer for the given object name
     */
    public static Closure getMethodPointer(Object object, String methodName) {
        if (object == null) {
            throw new NullPointerException("Cannot access method pointer for '" + methodName + "' on null object");
        }
        return new MethodClosure(object, methodName);
    }

    public static Object unaryMinus(Object value) {
        if (value instanceof Integer) {
            Integer number = (Integer) value;
            return Integer.valueOf(-number.intValue());
        }
        if (value instanceof Long) {
            Long number = (Long) value;
            return -number;
        }
        if (value instanceof BigInteger) {
            return ((BigInteger) value).negate();
        }
        if (value instanceof BigDecimal) {
            return ((BigDecimal) value).negate();
        }
        if (value instanceof Double) {
            Double number = (Double) value;
            return -number;
        }
        if (value instanceof Float) {
            Float number = (Float) value;
            return -number;
        }
        if (value instanceof Short) {
        	Short number = (Short) value;
        	return Short.valueOf((short) -number.shortValue());
        }
        if (value instanceof Byte) {
        	Byte number = (Byte) value;
        	return Byte.valueOf((byte) -number.byteValue());
        }
        if (value instanceof ArrayList) {
            // value is an list.
            List newlist = new ArrayList();
            Iterator it = ((ArrayList) value).iterator();
            for (; it.hasNext();) {
                newlist.add(unaryMinus(it.next()));
            }
            return newlist;
        }
        return invokeMethod(value, "negative", EMPTY_ARGS);
    }

    public static Object unaryPlus(Object value) {
        if (value instanceof Integer ||
                value instanceof Long ||
                value instanceof BigInteger ||
                value instanceof BigDecimal ||
                value instanceof Double ||
                value instanceof Float || 
                value instanceof Short || 
                value instanceof Byte) {
            return value;
        }
        if (value instanceof ArrayList) {
            // value is a list.
            List newlist = new ArrayList();
            Iterator it = ((ArrayList) value).iterator();
            for (; it.hasNext();) {
                newlist.add(unaryPlus(it.next()));
            }
            return newlist;
        }
        return invokeMethod(value, "positive", EMPTY_ARGS);
    }

    /**
     * Find the right hand regex within the left hand string and return a matcher.
     *
     * @param left  string to compare
     * @param right regular expression to compare the string to
     */
    public static Matcher findRegex(Object left, Object right) {
        String stringToCompare;
        if (left instanceof String) {
            stringToCompare = (String) left;
        } else {
            stringToCompare = toString(left);
        }
        String regexToCompareTo;
        if (right instanceof String) {
            regexToCompareTo = (String) right;
        } else if (right instanceof Pattern) {
            Pattern pattern = (Pattern) right;
            return pattern.matcher(stringToCompare);
        } else {
            regexToCompareTo = toString(right);
        }
        return Pattern.compile(regexToCompareTo).matcher(stringToCompare);
    }

    /**
     * Find the right hand regex within the left hand string and return a matcher.
     *
     * @param left  string to compare
     * @param right regular expression to compare the string to
     */
    public static boolean matchRegex(Object left, Object right) {
        if (left == null || right == null) return false;
        Pattern pattern;
        if (right instanceof Pattern) {
            pattern = (Pattern) right;
        } else {
            pattern = Pattern.compile(toString(right));
        }
        String stringToCompare = toString(left);
        Matcher matcher = pattern.matcher(stringToCompare);
        RegexSupport.setLastMatcher(matcher);
        return matcher.matches();
    }

    public static Tuple createTuple(Object[] array) {
        return new Tuple(array);
    }

    public static SpreadMap spreadMap(Object value) {
        if (value instanceof Map) {
            Object[] values = new Object[((Map) value).keySet().size() * 2];
            int index = 0;
            Iterator it = ((Map) value).keySet().iterator();
            for (; it.hasNext();) {
                Object key = it.next();
                values[index++] = key;
                values[index++] = ((Map) value).get(key);
            }
            return new SpreadMap(values);
        }
        throw new SpreadMapEvaluatingException("Cannot spread the map " + value.getClass().getName() + ", value " + value);
    }

    public static List createList(Object[] values) {
        List answer = new ArrayList(values.length);
        answer.addAll(Arrays.asList(values));
        return answer;
    }

    public static Map createMap(Object[] values) {
        Map answer = new LinkedHashMap(values.length / 2);
        int i = 0;
        while (i < values.length - 1) {
            if ((values[i] instanceof SpreadMap) && (values[i + 1] instanceof Map)) {
                Map smap = (Map) values[i + 1];
                Iterator iter = smap.keySet().iterator();
                for (; iter.hasNext();) {
                    Object key = iter.next();
                    answer.put(key, smap.get(key));
                }
                i += 2;
            } else {
                answer.put(values[i++], values[i++]);
            }
        }
        return answer;
    }

    public static void assertFailed(Object expression, Object message) {
        if (message == null || "".equals(message)) {
            throw new PowerAssertionError(expression.toString());
        }
        throw new AssertionError(String.valueOf(message) + ". Expression: " + expression);
    }

    public static Object runScript(Class scriptClass, String[] args) {
        Binding context = new Binding(args);
        Script script = createScript(scriptClass, context);
        return invokeMethod(script, "run", EMPTY_ARGS);
    }

    public static Script createScript(Class scriptClass, Binding context) {
        Script script = null;
        // for empty scripts
        if (scriptClass == null) {
            script = new Script() {
                public Object run() {
                    return null;
                }
            };
        } else {
            try {
                final GroovyObject object = (GroovyObject) scriptClass
                        .newInstance();
                if (object instanceof Script) {
                    script = (Script) object;
                } else {
                    // it could just be a class, so lets wrap it in a Script
                    // wrapper
                    // though the bindings will be ignored
                    script = new Script() {
                        public Object run() {
                            Object args = getBinding().getVariables().get("args");
                            Object argsToPass = EMPTY_MAIN_ARGS;
                            if (args != null && args instanceof String[]) {
                                argsToPass = args;
                            }
                            object.invokeMethod("main", argsToPass);
                            return null;
                        }
                    };
                    setProperties(object, context.getVariables());
                }
            } catch (Exception e) {
                throw new GroovyRuntimeException(
                        "Failed to create Script instance for class: "
                                + scriptClass + ". Reason: " + e, e);
            }
        }
        script.setBinding(context);
        return script;
    }

    /**
     * Sets the properties on the given object
     */
    public static void setProperties(Object object, Map map) {
        MetaClass mc = getMetaClass(object);
        for (Object o : map.entrySet()) {
            Map.Entry entry = (Map.Entry) o;
            String key = entry.getKey().toString();

            Object value = entry.getValue();
            try {
                mc.setProperty(object, key, value);
            } catch (MissingPropertyException mpe) {
                // Ignore
            }
        }
    }

    /**
     * @deprecated Use GroovySystem version instead.
     */
    public static String getVersion() {
        return ReleaseInfo.getVersion();
    }

    /**
     * Writes the given object to the given stream
     */
    public static void write(Writer out, Object object) throws IOException {
        if (object instanceof String) {
            out.write((String) object);
        } else if (object instanceof Object[]) {
            out.write(toArrayString((Object[]) object));
        } else if (object instanceof Map) {
            out.write(toMapString((Map) object));
        } else if (object instanceof Collection) {
            out.write(toListString((Collection) object));
        } else if (object instanceof Writable) {
            Writable writable = (Writable) object;
            writable.writeTo(out);
        } else if (object instanceof InputStream || object instanceof Reader) {
            // Copy stream to stream
            Reader reader;
            if (object instanceof InputStream) {
                reader = new InputStreamReader((InputStream) object);
            } else {
                reader = (Reader) object;
            }
            char[] chars = new char[8192];
            int i;
            while ((i = reader.read(chars)) != -1) {
                out.write(chars, 0, i);
            }
            reader.close();
        } else {
            out.write(toString(object));
        }
    }

    @SuppressWarnings("unchecked")
    public static Iterator<Object> asIterator(Object o) {
        return (Iterator) invokeMethod(o, "iterator", EMPTY_ARGS);
    }

    protected static String format(Object arguments, boolean verbose) {
        return format(arguments, verbose, -1);
    }

    public static String format(Object arguments, boolean verbose, int maxSize) {
        if (arguments == null) {
            final NullObject nullObject = NullObject.getNullObject();
            return (String) nullObject.getMetaClass().invokeMethod(nullObject, "toString", EMPTY_ARGS);
        }
        if (arguments.getClass().isArray()) {
            if (arguments instanceof char[]) {
                return new String((char[]) arguments);
            }
            return format(DefaultTypeTransformation.asCollection(arguments), verbose, maxSize);
        }
        if (arguments instanceof Range) {
            Range range = (Range) arguments;
            if (verbose) {
                return range.inspect();
            } else {
                return range.toString();
            }
        }
        if (arguments instanceof Collection) {
            return formatList((Collection) arguments, verbose, maxSize);
        }
        if (arguments instanceof Map) {
            return formatMap((Map) arguments, verbose, maxSize);
        }
        if (arguments instanceof Element) {
            return XmlUtil.serialize((Element) arguments);
        }
        if (arguments instanceof String) {
            if (verbose) {
                String arg = ((String) arguments).replaceAll("\\n", "\\\\n");    // line feed
                arg = arg.replaceAll("\\r", "\\\\r");      // carriage return
                arg = arg.replaceAll("\\t", "\\\\t");      // tab
                arg = arg.replaceAll("\\f", "\\\\f");      // form feed
                arg = arg.replaceAll("\\\"", "\\\\\"");    // double quotation mark
                arg = arg.replaceAll("\\\\", "\\\\");      // backslash
                return "\"" + arg + "\"";
            } else {
                return (String) arguments;
            }
        }
        // TODO: For GROOVY-2599 do we need something like below but it breaks other things
//        return (String) invokeMethod(arguments, "toString", EMPTY_ARGS);
        return arguments.toString();
    }

    private static String formatMap(Map map, boolean verbose, int maxSize) {
        if (map.isEmpty()) {
            return "[:]";
        }
        StringBuffer buffer = new StringBuffer("[");
        boolean first = true;
        for (Object o : map.entrySet()) {
            if (first) {
                first = false;
            } else {
                buffer.append(", ");
            }
            if (maxSize != -1 && buffer.length() > maxSize) {
                buffer.append("...");
                break;
            }
            Map.Entry entry = (Map.Entry) o;
            buffer.append(format(entry.getKey(), verbose));
            buffer.append(":");
            if (entry.getValue() == map) {
                buffer.append("(this Map)");
            } else {
                buffer.append(format(entry.getValue(), verbose, sizeLeft(maxSize, buffer)));
            }
        }
        buffer.append("]");
        return buffer.toString();
    }

    private static int sizeLeft(int maxSize, StringBuffer buffer) {
        return maxSize == -1 ? maxSize : Math.max(0, maxSize - buffer.length());
    }

    private static String formatList(Collection collection, boolean verbose, int maxSize) {
        StringBuffer buffer = new StringBuffer("[");
        boolean first = true;
        for (Object item : collection) {
            if (first) {
                first = false;
            } else {
                buffer.append(", ");
            }
            if (maxSize != -1 && buffer.length() > maxSize) {
                buffer.append("...");
                break;
            }
            if (item == collection) {
                buffer.append("(this Collection)");
            } else {
                buffer.append(format(item, verbose, sizeLeft(maxSize, buffer)));
            }
        }
        buffer.append("]");
        return buffer.toString();
    }

    /**
     * A helper method to format the arguments types as a comma-separated list.
     *
     * @param arguments the type to process
     * @return the string representation of the type
     */
    public static String toTypeString(Object[] arguments) {
        if (arguments == null) {
            return "null";
        }
        StringBuffer argBuf = new StringBuffer();
        for (int i = 0; i < arguments.length; i++) {
            if (i > 0) {
                argBuf.append(", ");
            }
            argBuf.append(arguments[i] != null ? arguments[i].getClass().getName() : "null");
        }
        return argBuf.toString();
    }

    /**
     * A helper method to return the string representation of a map with bracket boundaries "[" and "]".
     *
     * @param arg the map to process
     * @return the string representation of the map
     */
    public static String toMapString(Map arg) {
        return toMapString(arg, -1);
    }

    /**
     * A helper method to return the string representation of a map with bracket boundaries "[" and "]".
     *
     * @param arg     the map to process
     * @param maxSize stop after approximately this many characters and append '...'
     * @return the string representation of the map
     */
    public static String toMapString(Map arg, int maxSize) {
        return formatMap(arg, false, maxSize);
    }

    /**
     * A helper method to return the string representation of a list with bracket boundaries "[" and "]".
     *
     * @param arg the collection to process
     * @return the string representation of the collection
     */
    public static String toListString(Collection arg) {
        return toListString(arg, -1);
    }

    /**
     * A helper method to return the string representation of a list with bracket boundaries "[" and "]".
     *
     * @param arg     the collection to process
     * @param maxSize stop after approximately this many characters and append '...'
     * @return the string representation of the collection
     */
    public static String toListString(Collection arg, int maxSize) {
        return formatList(arg, false, maxSize);
    }

    /**
     * A helper method to return the string representation of an array of objects
     * with brace boundaries "{" and "}".
     *
     * @param arguments the array to process
     * @return the string representation of the array
     */
    public static String toArrayString(Object[] arguments) {
        if (arguments == null) {
            return "null";
        }
        String sbdry = "[";
        String ebdry = "]";
        StringBuffer argBuf = new StringBuffer(sbdry);
        for (int i = 0; i < arguments.length; i++) {
            if (i > 0) {
                argBuf.append(", ");
            }
            argBuf.append(format(arguments[i], false));
        }
        argBuf.append(ebdry);
        return argBuf.toString();
    }

    public static List createRange(Object from, Object to, boolean inclusive) {
        try {
            return ScriptBytecodeAdapter.createRange(from, to, inclusive);
        } catch (RuntimeException re) {
            throw re;
        } catch (Error e) {
            throw e;
        } catch (Throwable t) {
            throw new RuntimeException(t);
        }
    }

    public static Object bitwiseNegate(Object value) {
        if (value instanceof Integer) {
            Integer number = (Integer) value;
            return ~number;
        }
        if (value instanceof Long) {
            Long number = (Long) value;
            return ~number;
        }
        if (value instanceof BigInteger) {
            return ((BigInteger) value).not();
        }
        if (value instanceof String) {
            // value is a regular expression.
            return DefaultGroovyMethods.bitwiseNegate(value.toString());
        }
        if (value instanceof GString) {
            // value is a regular expression.
            return DefaultGroovyMethods.bitwiseNegate(value.toString());
        }
        if (value instanceof ArrayList) {
            // value is an list.
            List newlist = new ArrayList();
            Iterator it = ((ArrayList) value).iterator();
            for (; it.hasNext();) {
                newlist.add(bitwiseNegate(it.next()));
            }
            return newlist;
        }
        return invokeMethod(value, "bitwiseNegate", EMPTY_ARGS);
    }

    public static MetaClassRegistry getMetaRegistry() {
        return metaRegistry;
    }

    public static MetaClass getMetaClass(Object object) {
        if (object instanceof GroovyObject)
            return ((GroovyObject) object).getMetaClass();
        else
            return ((MetaClassRegistryImpl) GroovySystem.getMetaClassRegistry()).getMetaClass(object);
    }

    public static MetaClass getMetaClass(Class cls) {
        return metaRegistry.getMetaClass(cls);
    }

    /**
     * Invokes the given method on the object.
     */
    public static Object invokeMethod(Object object, String methodName, Object arguments) {
        if (object == null) {
            object = NullObject.getNullObject();
            //throw new NullPointerException("Cannot invoke method " + methodName + "() on null object");
        }

        // if the object is a Class, call a static method from that class
        if (object instanceof Class) {
            Class theClass = (Class) object;
            MetaClass metaClass = metaRegistry.getMetaClass(theClass);
            return metaClass.invokeStaticMethod(object, methodName, asArray(arguments));
        }

        // it's an instance; check if it's a Java one
        if (!(object instanceof GroovyObject)) {
            return invokePojoMethod(object, methodName, arguments);
        }

        // a groovy instance (including builder, closure, ...)
        return invokePogoMethod(object, methodName, arguments);
    }

    static Object invokePojoMethod(Object object, String methodName, Object arguments) {
        MetaClass metaClass = InvokerHelper.getMetaClass(object);
        return metaClass.invokeMethod(object, methodName, asArray(arguments));
    }

    static Object invokePogoMethod(Object object, String methodName, Object arguments) {
        GroovyObject groovy = (GroovyObject) object;
        boolean intercepting = groovy instanceof GroovyInterceptable;
        try {
            // if it's a pure interceptable object (even intercepting toString(), clone(), ...)
            if (intercepting) {
                return groovy.invokeMethod(methodName, asUnwrappedArray(arguments));
            }
            //else try a statically typed method or a GDK method
            return groovy.getMetaClass().invokeMethod(object, methodName, asArray(arguments));
        } catch (MissingMethodException e) {
            if (e instanceof MissingMethodExecutionFailed) {
                throw (MissingMethodException) e.getCause();
            } else if (!intercepting && e.getMethod().equals(methodName) && object.getClass() == e.getType()) {
                // in case there's nothing else, invoke the object's own invokeMethod()
                return groovy.invokeMethod(methodName, asUnwrappedArray(arguments));
            } else {
                throw e;
            }
        }
    }

    public static Object invokeSuperMethod(Object object, String methodName, Object arguments) {
        if (object == null) {
            throw new NullPointerException("Cannot invoke method " + methodName + "() on null object");
        }

        Class theClass = object.getClass();

        MetaClass metaClass = metaRegistry.getMetaClass(theClass.getSuperclass());
        return metaClass.invokeMethod(object, methodName, asArray(arguments));
    }

    public static Object invokeStaticMethod(Class type, String method, Object arguments) {
        MetaClass metaClass = metaRegistry.getMetaClass(type);
        return metaClass.invokeStaticMethod(type, method, asArray(arguments));
    }

    public static Object invokeConstructorOf(Class type, Object arguments) {
        MetaClass metaClass = metaRegistry.getMetaClass(type);
        return metaClass.invokeConstructor(asArray(arguments));
    }

    /**
     * Converts the given object into an array; if its an array then just
     * cast otherwise wrap it in an array
     */
    public static Object[] asArray(Object arguments) {

        if (arguments == null) {
            return EMPTY_ARGUMENTS;
        }
        if (arguments instanceof Object[]) {
            return (Object[]) arguments;
        }
        return new Object[]{arguments};
    }

    public static Object[] asUnwrappedArray(Object arguments) {

        Object[] args = asArray(arguments);

        for (int i = 0; i < args.length; i++) {
            if (args[i] instanceof PojoWrapper) {
                args[i] = ((PojoWrapper) args[i]).unwrap();
            }
        }

        return args;
    }
}

Other Groovy examples (source code examples)

Here is a short list of links related to this Groovy InvokerHelper.java source code file:

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Copyright 1998-2014 Alvin Alexander, alvinalexander.com
All Rights Reserved.