org.ow2.util.archive.impl.URLArchiveImpl Maven / Gradle / Ivy

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/**
 * Copyright 2007-2012 Bull S.A.S.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.ow2.util.archive.impl;

import java.io.IOException;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.jar.JarInputStream;
import java.util.jar.Manifest;
import java.util.zip.ZipEntry;

import org.ow2.util.archive.api.IArchive;

/**
 * Implementation of an archive from an url targeting a jar.
 * @author Gael Lalire
 */
public class URLArchiveImpl extends AbsArchiveImpl implements IArchive {

    /**
     * Entries in jar.
     */
    private Map entries;

    /**
     * Jar url.
     */
    private URL url;

    /**
     * Constructor.
     * @param url the url targeting a jar
     * @throws IOException if jar could not be read
     */
    public URLArchiveImpl(final URL url) throws IOException {
        this.url = url;
        entries = new HashMap();
        JarInputStream jarInputStream = new JarInputStream(url.openStream());
        Manifest manifest = jarInputStream.getManifest();
        // Read manifest
        if (manifest != null) {
            readManifest(manifest);
        }
        ZipEntry zipEntry = jarInputStream.getNextEntry();
        while (zipEntry != null) {
            String name = zipEntry.getName();
            entries.put(name, new URL("jar:" + url + "!/" + name));
            zipEntry = jarInputStream.getNextEntry();
        }
        jarInputStream.close();
    }

    /**
     * Close the archive.
     * @return true
     */
    public boolean close() {
        return true;
    }

    /**
     * Get archive name.
     * @return the url path
     */
    public String getName() {
        return url.getPath();
    }

    /**
     * @param resourceName the resource name
     * @return a resource with resourceName
     */
    public URL getResource(final String resourceName) {
        return entries.get(resourceName);
    }

    /**
     * @return all resources in jar
     */
    public Iterator getResources() {
        return entries.values().iterator();
    }

    /**
     * @param resourceName the resource name
     * @return all resources with resourceName
     */
    public Iterator getResources(final String resourceName) {
        List urlList = new LinkedList();
        URL url = entries.get(resourceName);
        if (url != null) {
            urlList.add(url);
        }
        return urlList.iterator();
    }

    /**
     * @return the url of archive
     */
    public URL getURL() {
        return url;
    }

    /**
     * @return all resources name
     */
    public Iterator getEntries() {
        return entries.keySet().iterator();
    }

}