/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 *
 * 5. Products derived from this software may not be called "Apache"
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.tools.ant.taskdefs;

import org.apache.tools.ant.*;
import java.io.*;

/**
 * Will set the given property if the specified target has a timestamp greater
 * than all of the source files.
 *
 * @author William Ferguson <a href="mailto:williamf@mincom.com">williamf@mincom.com</a>
 */

public class UpToDate extends MatchingTask {

    private String _property;
    private String _targetFileName;
    private File _sourceDirectory;

    /**
     * The property to set if the target file is more up to date than each of
     * the source files.
     *
     * @param property the name of the property to set if Target is up to date.
     */
    public void setProperty(String property) {
        _property = property;
    }

    /**
     * The file which must be more up to date than each of the source files
     * if the property is to be set.
     *
     * @param filename the name of the file which we are checking against.
     */
    public void setTargetFileName(String filename) {
        _targetFileName = filename;
    }

    /**
     * Setter for the base directory of the source files. The timestamp of the
     * target file is checked against the timestamp of all the source files.
     * Source files are specified by the srcDir and a set of patterns from the
     * @link#MatchingTask
     *
     * @param inDir the directory from which the source files can be found.
     */
    public void setSrcDir(File inDir) {
        _sourceDirectory = inDir;
    }

    /**
     * Sets property to true if target file has a more recent timestamp than
     * each of the source files.
     */
    public void execute() throws BuildException {

        if (_sourceDirectory == null) {
          throw new BuildException("The srcDir attribute must be set");
        }

        // get file for target file name
        File targetFile = new File(_targetFileName);
        if (!targetFile.exists()) return; // if not there then it can't be up to date

        // get collection of source files
        DirectoryScanner ds = getDirectoryScanner(_sourceDirectory);
        ds.scan();
        String[] files = ds.getIncludedFiles();

        for (int i = 0; i < files.length; i++) {
          File sourceFile = new File(_sourceDirectory, files[i]);
          if (sourceFile.lastModified() > targetFile.lastModified()) return; // sourceFile is more recent - so target is not up to date
        }

        // if we have made it this far then the Target is up to date
        this.project.setProperty(_property, "true");
    }
}