org.apache.openjpa.util.DelayedCollectionChangeTrackerImpl 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 org.apache.openjpa.util;
import java.util.ArrayList;
import java.util.Collection;
/**
* A collection change tracker used by delay loaded collections.
*
* @nojavadoc
*/
public class DelayedCollectionChangeTrackerImpl
extends CollectionChangeTrackerImpl {
public DelayedCollectionChangeTrackerImpl(Collection coll, boolean dups,
boolean order,boolean autoOff) {
super(coll, dups, order, autoOff);
}
protected void add(Object elem) {
if (rem == null || !rem.remove(elem)) {
if (add == null) {
if (_dups || _order)
add = new ArrayList();
else
add = newSet();
}
add.add(elem);
} else {
if (change == null)
change = newSet();
change.add(elem);
}
}
protected void remove(Object elem) {
if (add == null || !add.remove(elem)) {
if (rem == null)
rem = newSet();
rem.add(elem);
}
}
protected void change(Object elem) {
throw new InternalException();
}
}