/*
* 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.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
/**
* Implementation of {@link Jar} that is optimised for file based JAR URLs (e.g
* URLs of the form jar:file:...).
*/
public class FileUrlJar implements Jar {
private JarFile jarFile;
private Enumeration<JarEntry> entries;
private JarEntry entry = null;
public FileUrlJar(URL url) throws IOException {
JarURLConnection jarConn = (JarURLConnection) url.openConnection();
jarFile = jarConn.getJarFile();
}
@Override
public boolean entryExists(String name) {
ZipEntry entry = jarFile.getEntry(name);
return entry != null;
}
@Override
public InputStream getInputStream(String name) throws IOException {
ZipEntry entry = jarFile.getEntry(name);
if (entry == null) {
return null;
} else {
return jarFile.getInputStream(entry);
}
}
@Override
public void close() {
if (jarFile != null) {
try {
jarFile.close();
} catch (IOException e) {
// Ignore
}
}
}
@Override
public void nextEntry() {
if (entries == null) {
entries = jarFile.entries();
}
if (entries.hasMoreElements()) {
entry = entries.nextElement();
} else {
entry = null;
}
}
@Override
public String getEntryName() {
if (entry == null) {
return null;
} else {
return entry.getName();
}
}
@Override
public InputStream getEntryInputStream() throws IOException {
if (entry == null) {
return null;
} else {
return jarFile.getInputStream(entry);
}
}
@Override
public void reset() throws IOException {
entries = null;
entry = null;
}
}