ant/src/main/org/apache/tools/ant/taskdefs/Untar.java

/*
 * 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", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
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 * 5. Products derived from this software may not be called "Apache"
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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.*;

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

    private boolean overwrite = true;
    
    /**
     * Do the work.
     *
     * @exception BuildException Thrown in unrecoverable error.
     */
    public void execute() throws BuildException {

        Touch touch = (Touch) project.createTask("touch");
        touch.setOwningTarget(target);
        touch.setTaskName(getTaskName());
        touch.setLocation(getLocation());
                    
        File srcF = source;

        TarInputStream tis = null;
        try {
            if (source == null) {
                throw new BuildException("No source specified", location);
            }
            if (!srcF.exists()) {
                throw new BuildException("source "+srcF+" doesn't exist",
                                         location);
            }

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

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

            while ((te = tis.getNextEntry()) != null) {
                try {
                    File f = new File(dir, project.translatePath(te.getName()));
                    if (!overwrite && f.exists() 
                        && f.lastModified() >= te.getModTime().getTime()) {
                        log("Skipping " + f + " as it is up-to-date",
                            Project.MSG_DEBUG);
                        continue;
                    }
                    
                    log("expanding " + te.getName() + " to "+ f, 
                        Project.MSG_VERBOSE);
                    File dirF=new File(f.getParent());
                    dirF.mkdirs();

                    if (te.isDirectory()) {
                        f.mkdirs();
                    } else {
                        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();
                    }

                    if (project.getJavaVersion() != Project.JAVA_1_1) {
                        touch.setFile(f);
                        touch.setMillis(te.getModTime().getTime());
                        touch.touch();
                    }

                } catch(FileNotFoundException ex) {
                    log("FileNotFoundException: " + te.getName(),
                        Project.MSG_WARN);
                }
            }
        } catch (IOException ioe) {
            throw new BuildException("Error while expanding " + srcF.getPath(),
                                     ioe, location);
	} finally {
	    if (tis != null) {
	        try {
	            tis.close();
	        }
	        catch (IOException e) {}
	    }
	}
    }

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

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

    /**
     * Should we overwrite files in dest, even if they are newer than
     * the corresponding entries in the archive?
     */
    public void setOverwrite(boolean b) {
        overwrite = b;
    }

}