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Groovy example source code file (ObjectArrayPutAtMetaMethod.java)

This example Groovy source code file (ObjectArrayPutAtMetaMethod.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

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

The Groovy ObjectArrayPutAtMetaMethod.java 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
 *
 *     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.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);
        else
            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 super.call(receiver, arg1, arg2);
        }
    }
}

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