source: AE/installer2/src/net/oni2/aeinstaller/backend/packages/unpack/Unpacker.java@ 655

package net.oni2.aeinstaller.backend.packages.unpack;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;

import org.apache.commons.io.FileUtils;

/**
 * @author Christian Illy
 */
public class Unpacker implements Runnable {
        /**
         * @author Christian Illy
         */
        public enum EState {
                /**
                 * Unpacker initialized but not started
                 */
                INIT,
                /**
                 * Unpack running
                 */
                RUNNING,
                /**
                 * Unpack interrupted
                 */
                INTERRUPTED,
                /**
                 * Unpack finished successfully
                 */
                FINISHED,
        };

        private UnpackListener listener;

        private File zip;
        private File target;

        private Thread t = null;

        private EState state = EState.INIT;

        /**
         * Initialize a new AE package unpacker
         * 
         * @param zipFile
         *            AE zip package
         * @param targetFolder
         *            Target folder
         * @param listener
         *            Listener for progress updates
         */
        public Unpacker(File zipFile, File targetFolder, UnpackListener listener) {
                this.listener = listener;
                zip = zipFile;
                target = targetFolder;
        }

        /**
         * Start the unpack process
         */
        public synchronized void start() {
                if (t == null) {
                        t = new Thread(this);
                        t.start();
                        state = EState.RUNNING;
                        updateStatus();
                }
        }

        /**
         * Stop (abort) the process
         */
        public synchronized void stop() {
                if (state != EState.FINISHED) {
                        state = EState.INTERRUPTED;
                        if (t != null) {
                                try {
                                        t.join();
                                } catch (InterruptedException e) {
                                        e.printStackTrace();
                                }
                                t = null;
                        }
                        updateStatus();
                        if (state != EState.FINISHED) {
                                if (target.exists()) {
                                        try {
                                                FileUtils.deleteDirectory(target);
                                        } catch (IOException e) {
                                                e.printStackTrace();
                                        }
                                }
                        }
                }
        }

        private synchronized void updateStatus() {
                listener.statusUpdate(this, state);
        }

        @Override
        public void run() {
                try {
                        switch (state) {
                                case INTERRUPTED:
                                        return;
                                case RUNNING:
                                        ZipFile zf = null;
                                        try {
                                                int pathStart = 0;
                                                String pathStartName = "";

                                                zf = new ZipFile(zip);
                                                
                                                if (target.exists())
                                                        FileUtils.deleteDirectory(target);
                                                target.mkdirs();

                                                for (Enumeration<? extends ZipEntry> e = zf.entries(); e
                                                                .hasMoreElements();) {
                                                        ZipEntry ze = e.nextElement();
                                                        if (ze.getName().toLowerCase()
                                                                        .endsWith("/mod_info.cfg")
                                                                        || ze.getName().toLowerCase()
                                                                                        .equals("mod_info.cfg")) {
                                                                pathStart = ze.getName().toLowerCase()
                                                                                .indexOf("mod_info.cfg");
                                                                pathStartName = ze.getName().substring(0,
                                                                                pathStart);
                                                        }
                                                }

                                                for (Enumeration<? extends ZipEntry> e = zf.entries(); e
                                                                .hasMoreElements();) {
                                                        if (state == EState.INTERRUPTED)
                                                                return;
                                                        ZipEntry ze = e.nextElement();
                                                        if (!ze.isDirectory()) {
                                                                if (ze.getName().startsWith(pathStartName)) {
                                                                        File targetFile = new File(target, ze
                                                                                        .getName().substring(pathStart));
                                                                        File parent = targetFile.getParentFile();
                                                                        parent.mkdirs();

                                                                        InputStream in = zf.getInputStream(ze);

                                                                        int read = 0;
                                                                        byte[] data = new byte[1024];
                                                                        FileOutputStream fileOut = new FileOutputStream(
                                                                                        targetFile);
                                                                        while ((read = in.read(data, 0, 1024)) != -1) {
                                                                                fileOut.write(data, 0, read);
                                                                        }
                                                                        fileOut.close();
                                                                }
                                                        }
                                                }
                                        } catch (ZipException e) {
                                                // TODO Auto-generated catch block
                                                e.printStackTrace();
                                        } catch (IOException e) {
                                                // TODO Auto-generated catch block
                                                e.printStackTrace();
                                        } finally {
                                                try {
                                                        if (zf != null)
                                                                zf.close();
                                                } catch (IOException e) {
                                                        e.printStackTrace();
                                                }
                                        }
                                        break;
                                default:
                                        break;
                        }
                } finally {
                }

                state = EState.FINISHED;
                updateStatus();
        }
}