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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* 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.apache.tuscany.model.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* A list that invokes added or removed methods when elements are added or removed.
*
*/
public abstract class NotifyingList<E> extends ArrayList<E> {
private boolean frozen;
public NotifyingList() {
}
public void freeze() {
frozen=true;
}
protected void checkNotFrozen() {
if (frozen)
throw new IllegalStateException("Attempt to modify a frozen list");
}
public boolean add(E element) {
checkNotFrozen();
boolean result=super.add(element);
added(element);
return result;
}
public void add(int index, E element) {
checkNotFrozen();
super.add(index, element);
added(element);
}
public boolean addAll(Collection<? extends E> c) {
checkNotFrozen();
boolean result=super.addAll(c);
for (E element : c)
added(element);
return result;
}
public boolean addAll(int index, Collection<? extends E> c) {
checkNotFrozen();
boolean result=super.addAll(index, c);
for (E element : c)
added(element);
return result;
}
public void clear() {
checkNotFrozen();
List<E> l=new ArrayList<E>(this);
super.clear();
for (E element : l)
removed(element);
}
public E remove(int index) {
checkNotFrozen();
E element=super.remove(index);
removed(element);
return element;
}
@SuppressWarnings("unchecked")
public boolean remove(Object element) {
checkNotFrozen();
boolean result=super.remove(element);
removed((E)element);
return result;
}
@SuppressWarnings("unchecked")
public boolean removeAll(Collection<?> c) {
checkNotFrozen();
boolean result=super.removeAll(c);
for (E element : (Collection<? extends E>)c)
removed(element);
return result;
}
protected abstract void added(E element);
protected abstract void removed(E element);
}
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