/*
 * 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
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 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
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * 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 org.apache.tools.tar.*;
import java.io.*;
import java.util.Date;

/**
 * Untar a file.
 *
 * Heavily based on the Expand task.
 *
 * @author Stefan Bodewig <a href="mailto:stefan.bodewig@megabit.net">stefan.bodewig@megabit.net</a>
 */
public class Untar extends Task {
    private String dest; // req
    private String source; // req

    /**
     * Do the work.
     *
     * @exception BuildException Thrown in unrecoverable error.
     */
    public void execute() throws BuildException {
        try {
            if (source == null) {
                throw new BuildException("No source specified");
            }
            File srcF=project.resolveFile(source);
            if (!srcF.exists()) {
                throw new BuildException("source doesn't exist");
            }

            if (dest == null) {
                throw new BuildException("No destination specified");
            }

            File dir=project.resolveFile(dest);

            project.log("Expanding: " + srcF + " into " + dir, Project.MSG_INFO);
            // code from WarExpand
            TarInputStream tis = new TarInputStream(new FileInputStream(srcF));
            TarEntry te = null;

            while ((te = tis.getNextEntry()) != null) {
                try {
                    File f = new File(dir, project.translatePath(te.getName()));


                    project.log("expand-file " + te.getName() , "untar", Project.MSG_VERBOSE );
                    // create intermediary directories - sometimes tar don't add them
                    File dirF=new File(f.getParent());
                    dirF.mkdirs();

                    if (te.isDirectory()) {
                        f.mkdirs();
                    } else {
                        Date dt = te.getModTime();

                        byte[] buffer = new byte[1024];
                        int length = 0;
                        FileOutputStream fos = new FileOutputStream(f);

                        while ((length = tis.read(buffer)) >= 0) {
                            fos.write(buffer, 0, length);
                        }

                        fos.close();
                        boolean bo = f.setLastModified(dt.getTime());
                    }
                } catch( FileNotFoundException ex ) {
                    System.out.println("FileNotFoundException: " +  te.getName()  );
                }
            }
        } catch (IOException ioe) {
            throw new BuildException(ioe);
        }
    }

    /**
     * Set the destination directory. File will be untared into the
     * destination directory.
     *
     * @param d Path to the directory.
     */
    public void setDest(String d) {
        this.dest=d;
    }

    /**
     * Set the path to tar-file.
     *
     * @param s Path to tar-file.
     */
    public void setSrc(String s) {
        this.source = s;
    }
}