Java Resource File unpackDeps(final String resource, final ClassLoader cl)

Description

unpack Deps

License

Open Source License

Declaration

public static File unpackDeps(final String resource,
            final ClassLoader cl) throws ZipException, IOException,
            URISyntaxException 

Method Source Code

//package com.java2s;
/**/*from  w ww .  j a  va  2s  .com*/
 * Copyright (C) 2010 STMicroelectronics
 *
 * This file is part of "Mind Compiler" is free software: you can redistribute 
 * it and/or modify it under the terms of the GNU Lesser General Public License 
 * as published by the Free Software Foundation, either version 3 of the 
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Contact: mind@ow2.org
 *
 * Authors: Matthieu Leclercq
 * Contributors: 
 */

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;

public class Main {
    private static final String TEST_DEPS_DIR = "target/test-deps";
    private static final String JAR_PROTOCOL = "jar";
    private static final String FILE_PROTOCOL = "file";
    private static Map<File, File> unpackedJars = new HashMap<File, File>();

    public static File unpackDeps(final String resource,
            final ClassLoader cl) throws ZipException, IOException,
            URISyntaxException {
        final URL url = cl.getResource(resource);
        if (url == null)
            throw new IllegalArgumentException("Can't find " + resource
                    + " in classpath.");
        final String protocol = url.getProtocol();
        if (protocol.equals(JAR_PROTOCOL)) {
            String path = url.getPath();
            final int i = path.indexOf('!');
            if (i <= 0) {
                throw new IllegalArgumentException("Illegal URL " + url
                        + " Can't find jar file URL section.");
            }
            path = path.substring(0, i);
            final URL jarURL = new URL(path);
            if (!jarURL.getProtocol().equals(FILE_PROTOCOL)) {
                throw new IllegalArgumentException("Illegal URL " + url
                        + " Invalid URL protocol for jar file");
            }
            final File jarFile = new File(jarURL.toURI().getPath());
            if (!jarFile.exists())
                throw new IllegalArgumentException("Illegal URL path "
                        + jarFile);
            File unpackedJar = unpackedJars.get(jarFile);
            if (unpackedJar == null) {
                unpackedJar = unpackJar(jarFile);
                unpackedJars.put(jarFile, unpackedJar);
            }
            return unpackedJar;
        } else if (protocol.equals(FILE_PROTOCOL)) {
            File f = new File(url.toURI());
            String s = resource;
            int i = s.lastIndexOf('/');
            while (i > 0) {
                f = f.getParentFile();
                s = s.substring(0, i);
                i = s.lastIndexOf('/');
            }
            if (s.length() > 0) {
                f = f.getParentFile();
            }
            return f;
        } else {
            throw new IllegalArgumentException("Invalid URL protocol "
                    + url);
        }
    }

    private static File unpackJar(final File jarFile) throws ZipException,
            IOException {
        String jarName = jarFile.getName();
        final int i = jarName.lastIndexOf('.');
        if (i > 0)
            jarName = jarName.substring(0, i);
        final File toDir = new File(TEST_DEPS_DIR, jarName);
        if (toDir.lastModified() > jarFile.lastModified()) {
            System.out.println("Package " + jarFile + " is uptodate in "
                    + toDir);
            return toDir;
        }

        if (toDir.exists()) {
            delete(toDir);
        }
        System.out.println("Unpacking " + jarFile + " to " + toDir);
        final ZipFile f = new ZipFile(jarFile);
        final Enumeration<? extends ZipEntry> entries = f.entries();
        final byte[] b = new byte[1024];
        while (entries.hasMoreElements()) {
            final ZipEntry entry = entries.nextElement();
            final File of = new File(toDir, entry.getName());
            if (entry.isDirectory()) {
                of.mkdirs();
            } else {
                final InputStream is = new BufferedInputStream(
                        f.getInputStream(entry));
                of.getParentFile().mkdirs();
                final OutputStream os = new BufferedOutputStream(
                        new FileOutputStream(of));
                while (true) {
                    final int nbBytes = is.read(b);
                    if (nbBytes == -1)
                        break;
                    os.write(b, 0, nbBytes);
                }
                os.flush();
                os.close();
                is.close();
            }
        }
        return toDir;
    }

    public static void delete(final File f) {
        if (f.isDirectory()) {
            for (final File subFile : f.listFiles())
                delete(subFile);
        }
        f.delete();
    }
}

Related

1. resourceExists(String s)
2. runtimeResourceLocation(String src)
3. sanitizeResource(String inputResource)
4. toFile(Class c, String resource)
5. toStream(String resource)