groovy.lang.MetaClassRegistryChangeEvent Maven / Gradle / Ivy
/*
* 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 java.util.EventObject;
/**
* An event used to propagate meta class updates
*
* @author Jochen Theodorou
*/
public class MetaClassRegistryChangeEvent extends EventObject {
private static final long serialVersionUID = 1647849176793457976L;
private final Class clazz;
private final Object instance;
private final MetaClass metaClass;
private final MetaClass oldMetaClass;
/**
*Constructs a new MetaClassRegistryChangeEvent Object
*
* @param source The object the the event originates at.
* @param instance Object instance the MetaClass change is on.
* @param clazz The class that is affected by the registry change
* @param oldMetaClass The old MetaClass
* @param newMetaClass The new MetaClass
*/
public MetaClassRegistryChangeEvent(Object source, Object instance, Class clazz, MetaClass oldMetaClass, MetaClass newMetaClass) {
super(source);
this.clazz = clazz;
this.metaClass = newMetaClass;
this.oldMetaClass = oldMetaClass;
this.instance = instance;
}
/**
* Get the class that is updated.
*
*@return The updated class
*/
public Class getClassToUpdate() {
return clazz;
}
/**
* Get the new MetaClass
*
* @return The new MetaClass
*/
public MetaClass getNewMetaClass() {
return metaClass;
}
/**
* Get the old MetaClass
*
* @return The old MetaClass
*/
public MetaClass getOldMetaClass() {
return oldMetaClass;
}
/**
* Determines if this event is for a change for a single instance or all instances of the Class.
*
* @return whether this event is for a single instance
*/
public boolean isPerInstanceMetaClassChange() {
return instance!=null;
}
/**
* Returns the instance this event is for.
*
* @return the instance or null if this event is for a change for all instances of a class
*/
public Object getInstance() {
return instance;
}
/**
* Get the MetaClassRegistry that originates this change
*
* @return the source MetaClassRegistry
*/
public MetaClassRegistry getRegistry() {
return (MetaClassRegistry) source;
}
}