org.apache.cayenne.commitlog.model.MutableToManyRelationshipChange 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.cayenne.commitlog.model;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import org.apache.cayenne.ObjectId;
/**
* @since 4.0
*/
public class MutableToManyRelationshipChange implements ToManyRelationshipChange {
private Collection added;
private Collection removed;
@Override
public T accept(PropertyChangeVisitor visitor) {
return visitor.visitToManyRelationship(this);
}
@Override
public Collection getAdded() {
return added == null ? Collections. emptyList() : added;
}
@Override
public Collection getRemoved() {
return removed == null ? Collections. emptyList() : removed;
}
public void connected(ObjectId o) {
// TODO: cancel previously removed ?
if (added == null) {
added = new ArrayList<>();
}
added.add(o);
}
public void disconnected(ObjectId o) {
// TODO: cancel previously added ?
if (removed == null) {
removed = new ArrayList<>();
}
removed.add(o);
}
}