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/*
* 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.jar.JarEntry;
import java.util.jar.JarFile;
/**
* Implementation of {@link Jar} that is optimised for file based JAR URLs that
* refer to a JAR file nested inside a WAR
* (e.g URLs of the form jar:file: ... .war!/ ... .jar).
*/
public class JarFileUrlNestedJar implements Jar {
private final URL jarFileURL;
private final JarFile warFile;
private final JarEntry jarEntry;
private NonClosingJarInputStream jarInputStream = null;
private JarEntry entry = null;
public JarFileUrlNestedJar(URL url) throws IOException {
jarFileURL = url;
JarURLConnection jarConn = (JarURLConnection) url.openConnection();
jarConn.setUseCaches(false);
warFile = jarConn.getJarFile();
String urlAsString = url.toString();
int pathStart = urlAsString.indexOf("!/") + 2;
String jarPath = urlAsString.substring(pathStart);
jarEntry = warFile.getJarEntry(jarPath);
}
@Override
public URL getJarFileURL() {
return jarFileURL;
}
@Override
public boolean entryExists(String name) throws IOException {
reset();
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 {
reset();
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 long getLastModified(String name) throws IOException {
reset();
JarEntry entry = jarInputStream.getNextJarEntry();
while (entry != null) {
if (name.equals(entry.getName())) {
break;
}
entry = jarInputStream.getNextJarEntry();
}
if (entry == null) {
return -1;
} else {
return entry.getTime();
}
}
@Override
public String getURL(String entry) {
StringBuilder result = new StringBuilder("jar:");
result.append(getJarFileURL().toExternalForm());
result.append("!/");
result.append(entry);
return result.toString();
}
@Override
public void close() {
closeInner();
if (warFile != null) {
try {
warFile.close();
} catch (IOException e) {
// Ignore
}
}
}
private void closeInner() {
if (jarInputStream != null) {
try {
jarInputStream.reallyClose();
} catch (IOException ioe) {
// Ignore
}
}
}
private NonClosingJarInputStream createJarInputStream() throws IOException {
return new NonClosingJarInputStream(warFile.getInputStream(jarEntry));
}
@Override
public void nextEntry() {
if (jarInputStream == null) {
try {
jarInputStream = createJarInputStream();
} catch (IOException e) {
entry = null;
return;
}
}
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 {
if (jarInputStream == null) {
createJarInputStream();
}
return jarInputStream;
}
@Override
public void reset() throws IOException {
closeInner();
jarInputStream = createJarInputStream();
}
}
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