001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.vfs2.provider.jar;
018
019import java.io.IOException;
020import java.io.InputStream;
021import java.io.OutputStream;
022import java.net.JarURLConnection;
023import java.net.MalformedURLException;
024import java.net.URL;
025import java.security.cert.Certificate;
026import java.util.jar.Attributes;
027import java.util.jar.JarEntry;
028import java.util.jar.JarFile;
029import java.util.jar.Manifest;
030
031import org.apache.commons.vfs2.FileContent;
032import org.apache.commons.vfs2.FileSystemException;
033
034/**
035 * A default URL connection that will work for most file systems.
036 */
037public class JarURLConnectionImpl extends JarURLConnection {
038
039    // This is because JarURLConnection SUCKS
040    private static final String HACK_URL = "jar:http://somehost/somejar.jar!/";
041
042    private final FileContent fileContent;
043    private final URL parentURL;
044    private final JarFileObject jarFileObject;
045    private final String entryName;
046
047    /**
048     * Constructs a new instance.
049     *
050     * @param jarFileObject The JAR file.
051     * @param fileContent THe JAR file contents.
052     * @throws MalformedURLException Should not happen.
053     * @throws FileSystemException if an error occurs accessing the JAR file.
054     */
055    public JarURLConnectionImpl(final JarFileObject jarFileObject, final FileContent fileContent) throws MalformedURLException, FileSystemException {
056        // This is because JarURLConnection SUCKS!!
057        super(new URL(HACK_URL));
058
059        url = jarFileObject.getURL();
060        this.fileContent = fileContent;
061        parentURL = jarFileObject.getURL();
062        entryName = jarFileObject.getName().getPath();
063        this.jarFileObject = jarFileObject;
064    }
065
066    @Override
067    public void connect() {
068        connected = true;
069    }
070
071    @Override
072    public Attributes getAttributes() throws IOException {
073        return jarFileObject.getAttributes();
074    }
075
076    @Override
077    public Certificate[] getCertificates() {
078        return jarFileObject.doGetCertificates();
079    }
080
081    @Override
082    public int getContentLength() {
083        try {
084            return (int) fileContent.getSize();
085        } catch (final FileSystemException ignored) {
086            return -1;
087        }
088    }
089
090    @Override
091    public String getEntryName() {
092        return entryName;
093    }
094
095    @Override
096    public InputStream getInputStream() throws IOException {
097        return fileContent.getInputStream();
098    }
099
100    @Override
101    public JarEntry getJarEntry() throws IOException {
102        throw new FileSystemException("vfs.provider.jar/jar-entry-no-access.error");
103    }
104
105    @Override
106    public JarFile getJarFile() throws IOException {
107        throw new FileSystemException("vfs.provider.jar/jar-file-no-access.error");
108    }
109
110    @Override
111    public URL getJarFileURL() {
112        return parentURL;
113    }
114
115    @Override
116    public Manifest getManifest() throws IOException {
117        return jarFileObject.getManifest();
118    }
119
120    @Override
121    public OutputStream getOutputStream() throws IOException {
122        return fileContent.getOutputStream();
123    }
124
125}