/*
* 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 groovy.lang;
import groovy.lang.
MetaClassRegistry.
MetaClassCreationHandle;
import org.codehaus.groovy.reflection.
ClassInfo;
/**
* <p>A handle for the MetaClassRegistry that changes all classes loaded into the Grails VM
* to use ExpandoMetaClass instances
*
* <p>The handle should be registered with the Groovy runtime <strong>before</strong> Groovy loads, for example
* in your main method.
*
* <code>GroovySystem.metaClassRegistry.metaClassCreationHandle = new ExpandoMetaClassCreationHandle()</code>
*
* @see groovy.lang.MetaClassRegistry
* @see groovy.lang.MetaClassRegistry.MetaClassCreationHandle
* @see org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl#setMetaClassCreationHandle(groovy.lang.MetaClassRegistry.MetaClassCreationHandle)
*
* @author Graeme Rocher
* @since 1.5
*/
public class
ExpandoMetaClassCreationHandle extends
MetaClassCreationHandle {
public static final
ExpandoMetaClassCreationHandle instance = new
ExpandoMetaClassCreationHandle();
/* (non-Javadoc)
* @see groovy.lang.MetaClassRegistry.MetaClassCreationHandle#create(java.lang.Class, groovy.lang.MetaClassRegistry)
*/
protected
MetaClass createNormalMetaClass(
Class theClass,
MetaClassRegistry registry) {
if(
theClass !=
ExpandoMetaClass.class) {
return new
ExpandoMetaClass(
theClass, true, true);
}
else {
return super.createNormalMetaClass(
theClass,
registry);
}
}
/**
* Registers a modified ExpandoMetaClass with the creation handle
*
* @param emc The EMC
*/
public void
registerModifiedMetaClass(
ExpandoMetaClass emc) {
final
Class klazz =
emc.
getJavaClass();
GroovySystem.
getMetaClassRegistry().
setMetaClass(
klazz,
emc);
}
public boolean
hasModifiedMetaClass(
ExpandoMetaClass emc) {
return
emc.
getClassInfo().
getModifiedExpando() != null;
}
/**
* <p>Enables the ExpandoMetaClassCreationHandle with the registry
*
* <code>ExpandoMetaClassCreationHandle.enable();</code>
*
*/
public static void
enable() {
final
MetaClassRegistry metaClassRegistry =
GroovySystem.
getMetaClassRegistry();
synchronized (
metaClassRegistry) {
if (
metaClassRegistry.
getMetaClassCreationHandler() !=
instance) {
ClassInfo.
clearModifiedExpandos();
metaClassRegistry.
setMetaClassCreationHandle(
instance);
}
}
}
public static void
disable() {
final
MetaClassRegistry metaClassRegistry =
GroovySystem.
getMetaClassRegistry();
synchronized (
metaClassRegistry) {
if (
metaClassRegistry.
getMetaClassCreationHandler() ==
instance) {
ClassInfo.
clearModifiedExpandos();
metaClassRegistry.
setMetaClassCreationHandle(new
MetaClassCreationHandle());
}
}
}
}