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package org.apache.velocity.runtime.resource.loader;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.exception.VelocityException;
import org.apache.velocity.runtime.RuntimeServices;
import org.slf4j.Logger;
import java.io.IOException;
import java.io.InputStream;
import java.net.JarURLConnection;
import java.net.URL;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
/**
* A small wrapper around a Jar
*
* @author <a href="mailto:daveb@miceda-data.com">Dave Bryson</a>
* @version $Id$
*/
public class JarHolder
{
private String urlpath = null;
private JarFile theJar = null;
private JarURLConnection conn = null;
private Logger log = null;
/**
* @param rs
* @param urlpath
* @param log
*/
public JarHolder( RuntimeServices rs, String urlpath, Logger log )
{
this.log = log;
this.urlpath=urlpath;
init();
log.debug("JarHolder: initialized JAR: {}", urlpath);
}
/**
*
*/
public void init()
{
try
{
log.debug("JarHolder: attempting to connect to {}", urlpath);
URL url = new URL( urlpath );
conn = (JarURLConnection) url.openConnection();
conn.setAllowUserInteraction(false);
conn.setDoInput(true);
conn.setDoOutput(false);
conn.connect();
theJar = conn.getJarFile();
}
catch (IOException ioe)
{
String msg = "JarHolder: error establishing connection to JAR at \""
+ urlpath + "\"";
log.error(msg, ioe);
throw new VelocityException(msg, ioe);
}
}
/**
*
*/
public void close()
{
try
{
theJar.close();
}
catch ( Exception e )
{
String msg = "JarHolder: error closing the JAR file";
log.error(msg, e);
throw new VelocityException(msg, e);
}
theJar = null;
conn = null;
log.trace("JarHolder: JAR file closed");
}
/**
* @param theentry
* @return The requested resource.
* @throws ResourceNotFoundException
*/
public InputStream getResource( String theentry )
throws ResourceNotFoundException {
InputStream data = null;
try
{
JarEntry entry = theJar.getJarEntry( theentry );
if ( entry != null )
{
data = theJar.getInputStream( entry );
}
}
catch(Exception fnfe)
{
log.error("JarHolder: getResource() error", fnfe);
throw new ResourceNotFoundException(fnfe);
}
return data;
}
/**
* @return The entries of the jar as a hashtable.
*/
public Hashtable getEntries()
{
Hashtable allEntries = new Hashtable(559);
Enumeration all = theJar.entries();
while ( all.hasMoreElements() )
{
JarEntry je = (JarEntry)all.nextElement();
// We don't map plain directory entries
if ( !je.isDirectory() )
{
allEntries.put( je.getName(), this.urlpath );
}
}
return allEntries;
}
/**
* @return The URL path of this jar holder.
*/
public String getUrlPath()
{
return urlpath;
}
}
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