/*
 * Copyright 2004-2007 the original author or authors.
 *
 * 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.springframework.webflow.conversation;

import java.io.Serializable;

/**
 * An id that uniquely identifies a conversation managed by a {@link ConversationManager}.
 * 
 * @author Ben Hale
 * @author Keith Donald
 */
public abstract class ConversationId implements Serializable {

	/**
	 * Subclasses should override toString to return a parseable string form of the key.
	 * @see java.lang.Object#toString()
	 * @see ConversationManager#parseConversationId(String)
	 */
	public abstract String toString();
}