/*
* Copyright 2002-2005 The Apache Software Foundation.
*
* 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.apache.commons.vfs.provider.jar;
import org.apache.commons.vfs.FileName;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.provider.zip.ZipFileObject;
import java.io.IOException;
import java.security.cert.Certificate;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import java.util.zip.ZipEntry;
/**
* A file in a Jar file system.
*
* @author <a href="mailto:brian@mmmanager.org">Brian Olsen</a>
*/
public class JarFileObject extends ZipFileObject
{
private Attributes attributes;
final JarFileSystem fs;
protected JarFileObject(final FileName name,
final ZipEntry entry,
final JarFileSystem fs,
final boolean zipExists) throws FileSystemException
{
super(name, entry, fs, zipExists);
this.fs = fs;
try
{
getAttributes(); // early get the attributes as the zip file might be closed
}
catch (IOException e)
{
throw new FileSystemException(e);
}
}
/**
* Returns the Jar manifest.
*/
Manifest getManifest() throws IOException
{
if (fs.getZipFile() == null)
{
return null;
}
return ((JarFile) fs.getZipFile()).getManifest();
}
/**
* Returns the attributes of this file.
*/
Attributes getAttributes() throws IOException
{
if (attributes == null)
{
if (entry == null)
{
attributes = new Attributes(1);
}
else
{
attributes = ((JarEntry) entry).getAttributes();
if (attributes == null)
{
attributes = new Attributes(1);
}
}
}
return attributes;
}
/**
* Returns the value of an attribute.
*/
protected Map doGetAttributes()
throws Exception
{
final Map attrs = new HashMap();
// Add the file system's attributes first
final JarFileSystem fs = (JarFileSystem) getFileSystem();
addAll(fs.getAttributes(), attrs);
// Add this file's attributes
addAll(getAttributes(), attrs);
return attrs;
}
/**
* Adds the source attributes to the destination map.
*/
private void addAll(final Attributes src, final Map dest)
{
for (Iterator iterator = src.entrySet().iterator(); iterator.hasNext();)
{
final Map.Entry entry = (Map.Entry) iterator.next();
final String name = entry.getKey().toString().toLowerCase();
dest.put(name, entry.getValue());
}
}
/**
* Return the certificates of this JarEntry.
*/
protected Certificate[] doGetCertificates()
{
if (entry == null)
{
return null;
}
return ((JarEntry) entry).getCertificates();
}
}