/*
 * Copyright 2010-2012 Luca Garulli (l.garulli--at--orientechnologies.com)
 *
 * 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 com.orientechnologies.orient.core.db.record;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Container that contains information about all operations that were performed on collection starting from
 * the time when it was loaded from DB.
 *
 * @param <K> Value that uniquely identifies position of element inside collection.
 * @param <V> Value that is hold by collection.
 */
public class OMultiValueChangeTimeLine<K, V> {
	private final List<OMultiValueChangeEvent<K, V>> multiValueChangeEvents = new ArrayList<OMultiValueChangeEvent<K, V>>();

	/**
	 * @return <code>List</code> of all operations that were performed on collection starting from
	 * the time when it was loaded from DB.
	 */
	public List<OMultiValueChangeEvent<K, V>> getMultiValueChangeEvents() {
		return Collections.unmodifiableList(multiValueChangeEvents);
	}

	/**
	 * Add new operation that was performed on collection to collection history.
	 *
	 * @param changeEvent Description of operation that was performed on collection.
	 */
	public void addCollectionChangeEvent(OMultiValueChangeEvent<K, V> changeEvent) {
		multiValueChangeEvents.add(changeEvent);
	}
}
