| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.DelegatingMetaClass; |
| import groovy.lang.ExpandoMetaClass; |
| import groovy.lang.GroovyObject; |
| import groovy.lang.MetaBeanProperty; |
| import groovy.lang.MetaClass; |
| import groovy.lang.MetaMethod; |
| |
| import java.lang.reflect.Method; |
| |
| public class HandleMetaClass extends DelegatingMetaClass { |
| private Object object; |
| private static final Object NONE = new Object(); |
| |
| public HandleMetaClass(MetaClass mc) { |
| this(mc, null); |
| } |
| |
| public HandleMetaClass(MetaClass mc, Object obj) { |
| super(mc); |
| if (obj != null) { |
| if (InvokerHelper.getMetaClass(obj.getClass()) == mc || !(mc instanceof ExpandoMetaClass)) |
| object = obj; // object has default meta class, so we need to replace it on demand |
| else |
| object = NONE; // object already has per instance meta class |
| } |
| } |
| |
| public void initialize() { |
| replaceDelegate(); |
| delegate.initialize(); |
| } |
| |
| public GroovyObject replaceDelegate() { |
| if (object == null) { |
| if (!(delegate instanceof ExpandoMetaClass)) { |
| delegate = new ExpandoMetaClass(delegate.getTheClass(), true, true); |
| delegate.initialize(); |
| } |
| DefaultGroovyMethods.setMetaClass(delegate.getTheClass(), delegate); |
| } |
| else { |
| if (object != NONE) { |
| final MetaClass metaClass = delegate; |
| delegate = new ExpandoMetaClass(delegate.getTheClass(), false, true); |
| if (metaClass instanceof ExpandoMetaClass) { |
| ExpandoMetaClass emc = (ExpandoMetaClass) metaClass; |
| for (MetaMethod method : emc.getExpandoMethods()) |
| ((ExpandoMetaClass)delegate).registerInstanceMethod(method); |
| } |
| delegate.initialize(); |
| MetaClassHelper.doSetMetaClass(object, delegate); |
| object = NONE; |
| } |
| } |
| return (GroovyObject)delegate; |
| } |
| |
| public Object invokeMethod(String name, Object args) { |
| return replaceDelegate().invokeMethod(name, args); |
| } |
| |
| // this method mimics EMC behavior |
| public Object getProperty(String property) { |
| if(ExpandoMetaClass.isValidExpandoProperty(property)) { |
| if(property.equals(ExpandoMetaClass.STATIC_QUALIFIER) || |
| property.equals(ExpandoMetaClass.CONSTRUCTOR) || |
| Holder.META_CLASS.hasProperty(this, property) == null) { |
| return replaceDelegate().getProperty(property); |
| } |
| } |
| return Holder.META_CLASS.getProperty(this, property); |
| } |
| |
| public void setProperty(String property, Object newValue) { |
| replaceDelegate().setProperty(property, newValue); |
| } |
| |
| public void addNewInstanceMethod(Method method) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void addNewStaticMethod(Method method) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void addMetaMethod(MetaMethod metaMethod) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void addMetaBeanProperty(MetaBeanProperty metaBeanProperty) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean equals(Object obj) { |
| return super.equals(obj) || getAdaptee().equals(obj) || (obj instanceof HandleMetaClass && equals(((HandleMetaClass)obj).getAdaptee())); |
| } |
| |
| // Lazily initialize the single instance of the HandleMetaClass metaClass |
| private static class Holder { |
| static final MetaClass META_CLASS = InvokerHelper.getMetaClass(HandleMetaClass.class); |
| } |
| } |