001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.util.watch;
018
019import java.time.Instant;
020
021/**
022 * Interface to get the last time something was modified.
023 * 
024 * @author Jonathan Locke
025 * @since 1.2.6
026 */
027public interface IModifiable
028{
029        /**
030         * Gets the last time this modifiable thing changed.
031         * 
032         * @return the last modification <code>Time</code> or 
033         * <code>null</code> if that information is not available
034         */
035        Instant lastModifiedTime();
036}