trunk/src/java/org/apache/lenya/cms/repository/Persistable.java

/*
 * 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.lenya.cms.repository;

/**
 * An object which can be persisted to a node.
 */
public interface Persistable {

    /**
     * Save the content of the persistable object to the node. This method is called by the node
     * before the session is committed.
     * @throws RepositoryException if the object couldn't be saved.
     */
    void save() throws RepositoryException;
    
    /**
     * @return if the persistable object has been modified, i.e. if it needs to be saved.
     */
    boolean isModified();

}