| /* |
| * 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.tools.ant.types.selectors.modifiedselector; |
| |
| import java.io.File; |
| |
| /** |
| * Computes a 'timestamp' of file based on the lastModified time of that file. |
| * |
| * @version 2018-07-25 |
| * @since Ant 1.10.6 and 1.9.14 |
| */ |
| public class LastModifiedAlgorithm implements Algorithm { |
| |
| /** |
| * This algorithm doesn't need any configuration. |
| * Therefore it's always valid. |
| * @return always true |
| */ |
| public boolean isValid() { |
| return true; |
| } |
| |
| /** |
| * Computes a 'timestamp' for a file based on the lastModified time. |
| * @param file The file for which the value should be computed |
| * @return the timestamp or <i>null</i> if the timestamp couldn't be computed |
| */ |
| public String getValue(File file) { |
| long lastModified = file.lastModified(); |
| if (lastModified == 0L) { |
| return null; |
| } |
| |
| return Long.toString(lastModified); |
| } |
| } |