| /* |
| * 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; |
| |
| |
| /** |
| * The <i>Algorithm</i> defines how a value for a file is computed. |
| * It must be sure that multiple calls for the same file results in the |
| * same value. |
| * The implementing class should implement a useful toString() method. |
| * |
| * @version 2003-09-13 |
| * @since Ant 1.6 |
| */ |
| public interface Algorithm { |
| |
| /** |
| * Checks its prerequisites. |
| * @return <i>true</i> if all is ok, otherwise <i>false</i>. |
| */ |
| boolean isValid(); |
| |
| /** |
| * Get the value for a file. |
| * @param file File object for which the value should be evaluated. |
| * @return The value for that file |
| */ |
| String getValue(File file); |
| } |