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/*
* 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);
}
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