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.security.cert.Certificate;
021import java.util.HashMap;
022import java.util.Map;
023import java.util.Map.Entry;
024import java.util.jar.Attributes;
025import java.util.jar.JarEntry;
026import java.util.jar.JarFile;
027import java.util.jar.Manifest;
028import java.util.zip.ZipEntry;
029
030import org.apache.commons.vfs2.FileSystemException;
031import org.apache.commons.vfs2.provider.AbstractFileName;
032import org.apache.commons.vfs2.provider.zip.ZipFileObject;
033
034/**
035 * A file in a Jar file system.
036 */
037public class JarFileObject extends ZipFileObject {
038    private final JarFileSystem fs;
039
040    private Attributes attributes;
041
042    protected JarFileObject(final AbstractFileName name, final ZipEntry entry, final JarFileSystem fs,
043            final boolean zipExists) throws FileSystemException {
044        super(name, entry, fs, zipExists);
045        this.fs = fs;
046
047        try {
048            getAttributes(); // early get the attributes as the zip file might be closed
049        } catch (final IOException e) {
050            throw new FileSystemException(e);
051        }
052    }
053
054    /**
055     * Returns the Jar manifest.
056     */
057    Manifest getManifest() throws IOException {
058        if (fs.getZipFile() == null) {
059            return null;
060        }
061
062        return ((JarFile) fs.getZipFile()).getManifest();
063    }
064
065    /**
066     * Returns the attributes of this file.
067     */
068    Attributes getAttributes() throws IOException {
069        if (attributes == null) {
070            if (entry == null) {
071                attributes = new Attributes(1);
072            } else {
073                attributes = ((JarEntry) entry).getAttributes();
074                if (attributes == null) {
075                    attributes = new Attributes(1);
076                }
077            }
078        }
079
080        return attributes;
081    }
082
083    /**
084     * Returns the value of an attribute.
085     */
086    @Override
087    protected Map<String, Object> doGetAttributes() throws Exception {
088        final Map<String, Object> attrs = new HashMap<>();
089
090        // Add the file system's attributes first
091        final JarFileSystem fs = (JarFileSystem) getFileSystem();
092        addAll(fs.getAttributes(), attrs);
093
094        // Add this file's attributes
095        addAll(getAttributes(), attrs);
096
097        return attrs;
098    }
099
100    /**
101     * Adds the source attributes to the destination map.
102     */
103    private void addAll(final Attributes src, final Map<String, Object> dest) {
104        for (final Entry<Object, Object> entry : src.entrySet()) {
105            // final String name = entry.getKey().toString().toLowerCase();
106            final String name = entry.getKey().toString();
107            dest.put(name, entry.getValue());
108        }
109    }
110
111    /**
112     * Return the certificates of this JarEntry.
113     */
114    @Override
115    protected Certificate[] doGetCertificates() {
116        if (entry == null) {
117            return null;
118        }
119
120        return ((JarEntry) entry).getCertificates();
121    }
122}