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Groovy example source code file (

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

Java - Groovy tags/keywords

cachedclass, cachedclass, character, class, class, integer, metaclassimpl, metamethod, mypojometamethodsite, mypojometamethodsite, object, object, object_arr_class, param_class_arr

The Groovy source code

 * Copyright 2003-2007 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.codehaus.groovy.runtime.dgmimpl.arrays;

import groovy.lang.GString;
import groovy.lang.MetaClassImpl;
import groovy.lang.MetaMethod;
import org.codehaus.groovy.reflection.CachedClass;
import org.codehaus.groovy.reflection.ReflectionCache;
import org.codehaus.groovy.runtime.callsite.CallSite;
import org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;

public class ObjectArrayPutAtMetaMethod extends ArrayPutAtMetaMethod {
    private static final CachedClass OBJECT_CLASS = ReflectionCache.getCachedClass(Object.class);
    private static final CachedClass OBJECT_ARR_CLASS = ReflectionCache.OBJECT_ARRAY_CLASS;
    private static final CachedClass[] PARAM_CLASS_ARR = new CachedClass[]{INTEGER_CLASS, OBJECT_CLASS};

    public ObjectArrayPutAtMetaMethod() {
        parameterTypes = PARAM_CLASS_ARR;

    public final CachedClass getDeclaringClass() {
        return OBJECT_ARR_CLASS;

    public Object invoke(Object object, Object[] arguments) {
        final Object[] objects = (Object[]) object;
        final int index = normaliseIndex((Integer) arguments[0], objects.length);
        objects[index] = adjustNewValue(objects, arguments[1]);
        return null;

    private static Object adjustNewValue(Object[] objects, Object newValue) {
        Class arrayComponentClass = objects.getClass().getComponentType();
        Object adjustedNewVal = newValue;
        if (newValue instanceof Number) {
            if (!arrayComponentClass.equals(newValue.getClass())) {
                adjustedNewVal = DefaultTypeTransformation.castToType(newValue, arrayComponentClass);
        } else if (Character.class.isAssignableFrom(arrayComponentClass)) {
            adjustedNewVal = DefaultTypeTransformation.getCharFromSizeOneString(newValue);
        } else if (Number.class.isAssignableFrom(arrayComponentClass)) {
            if (newValue instanceof Character || newValue instanceof String || newValue instanceof GString) {
                Character ch = DefaultTypeTransformation.getCharFromSizeOneString(newValue);
                adjustedNewVal = DefaultTypeTransformation.castToType(ch, arrayComponentClass);
        return adjustedNewVal;

    public CallSite createPojoCallSite(CallSite site, MetaClassImpl metaClass, MetaMethod metaMethod, Class[] params, Object receiver, Object[] args) {
        if (!(args[0] instanceof Integer))
            return PojoMetaMethodSite.createNonAwareCallSite(site, metaClass, metaMethod, params, args);
            return new MyPojoMetaMethodSite(site, metaClass, metaMethod, params);

    private static class MyPojoMetaMethodSite extends PojoMetaMethodSite {
        public MyPojoMetaMethodSite(CallSite site, MetaClassImpl metaClass, MetaMethod metaMethod, Class[] params) {
            super(site, metaClass, metaMethod, params);

        public Object call(Object receiver, Object arg1, Object arg2) throws Throwable {
            if (checkPojoMetaClass()) {
                try {
                    final Object[] objects = (Object[]) receiver;
                    objects[normaliseIndex((Integer) arg1, objects.length)] = adjustNewValue(objects, arg2);
                    return null;
                catch (ClassCastException e) {
                    if ((receiver instanceof Object[]) && (arg1 instanceof Integer))
                        throw e;
            return, arg1, arg2);

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