JarUtils.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2014-2015 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
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 * Modifications:
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 * recipient has the option to distribute your version of this file under
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 */

package org.glassfish.jersey.server;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;

/**
 * @author Michal Gajdos
 */
public final class JarUtils {

    public enum Suffix {
        jar, zip
    }

    public static File createJarFile(final String base, final String... entries) throws IOException {
        return createJarFile(Suffix.jar, base, entries);
    }

    public static File createJarFile(final Suffix s, final String base, final String... entries) throws IOException {
        final Map<String, String> entriesMap = new HashMap<String, String>();
        for (final String entry : entries) {
            entriesMap.put(entry, entry);
        }
        return createJarFile(s, base, entriesMap);
    }

    public static File createJarFile(final String name, final Suffix s, final String base, final String... entries)
            throws IOException {
        final Map<String, String> entriesMap = new HashMap<String, String>();
        for (final String entry : entries) {
            entriesMap.put(entry, entry);
        }
        return createJarFile(name, s, base, entriesMap);
    }

    public static File createJarFile(final Suffix s, final String base, final Map<String, String> entries) throws IOException {
        return createJarFile("test", s, base, entries);
    }

    public static File createJarFile(final String name, final Suffix s, final String base, final Map<String, String> entries)
            throws IOException {
        final File tempJar = File.createTempFile(name, "." + s);
        tempJar.deleteOnExit();
        final JarOutputStream jos = new JarOutputStream(
                new BufferedOutputStream(
                        new FileOutputStream(tempJar)), new Manifest());

        final Set<String> usedSegments = new HashSet<String>();
        for (final Map.Entry<String, String> entry : entries.entrySet()) {
            for (final String path : getPaths(entry.getValue())) {
                if (usedSegments.contains(path)) {
                    continue;
                }

                usedSegments.add(path);
                final JarEntry e = new JarEntry(path);
                jos.putNextEntry(e);
                jos.closeEntry();
            }

            final JarEntry e = new JarEntry(entry.getValue());
            jos.putNextEntry(e);

            final InputStream f = new BufferedInputStream(
                    new FileInputStream(base + entry.getKey()));
            final byte[] buf = new byte[1024];
            int read = 1024;
            while ((read = f.read(buf, 0, read)) != -1) {
                jos.write(buf, 0, read);
            }
            jos.closeEntry();
        }

        jos.close();
        return tempJar;
    }

    private static String[] getPaths(final String entry) {
        final String[] segments = entry.split("/");
        final String[] paths = new String[segments.length - 1];

        if (paths.length == 0) {
            return paths;
        }

        paths[0] = segments[0] + "/";
        for (int i = 1; i < paths.length; i++) {
            paths[i] = "";
            for (int j = 0; j <= i; j++) {
                paths[i] += segments[j] + "/";
            }
        }

        return paths;
    }

    /**
     * Prevent instantiation.
     */
    private JarUtils() {
    }
}