/*
* 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.
*/
package org.apache.tomcat.util.scan;
import java.io.IOException;
import java.io.InputStream;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.jar.JarEntry;
/**
* Implementation of {@link Jar} that is optimised for non-file based JAR URLs
* (e.g. JNDI based URLs of the form jar:jndi:...).
*/
public class UrlJar implements Jar {
private NonClosingJarInputStream jarInputStream = null;
private URL url = null;
private JarEntry entry = null;
public UrlJar(URL url) throws IOException {
this.url = url;
this.jarInputStream = createJarInputStream();
}
@Override
public boolean entryExists(String name) throws IOException {
JarEntry entry = jarInputStream.getNextJarEntry();
while (entry != null) {
if (name.equals(entry.getName())) {
break;
}
entry = jarInputStream.getNextJarEntry();
}
return entry != null;
}
@Override
public InputStream getInputStream(String name) throws IOException {
JarEntry entry = jarInputStream.getNextJarEntry();
while (entry != null) {
if (name.equals(entry.getName())) {
break;
}
entry = jarInputStream.getNextJarEntry();
}
if (entry == null) {
return null;
} else {
return jarInputStream;
}
}
@Override
public void close() {
if (jarInputStream != null) {
try {
jarInputStream.reallyClose();
} catch (IOException ioe) {
// Ignore
}
}
}
private NonClosingJarInputStream createJarInputStream() throws IOException {
JarURLConnection jarConn = (JarURLConnection) url.openConnection();
URL resourceURL = jarConn.getJarFileURL();
URLConnection resourceConn = resourceURL.openConnection();
resourceConn.setUseCaches(false);
return new NonClosingJarInputStream(resourceConn.getInputStream());
}
@Override
public void nextEntry() {
try {
entry = jarInputStream.getNextJarEntry();
} catch (IOException ioe) {
entry = null;
}
}
@Override
public String getEntryName() {
if (entry == null) {
return null;
} else {
return entry.getName();
}
}
@Override
public InputStream getEntryInputStream() throws IOException {
return jarInputStream;
}
@Override
public void reset() throws IOException {
close();
jarInputStream = createJarInputStream();
}
}