org.apache.xbean.finder.archive.JarArchive Maven / Gradle / Ivy
/**
* 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.xbean.finder.archive;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import java.util.zip.ZipEntry;
/**
* @version $Rev$ $Date$
*/
public class JarArchive implements Archive, AutoCloseable {
private final ClassLoader loader;
private final URL url;
private final JarFile jar;
private final MJarSupport mjar = new MJarSupport();
/*
* Supports only 'file:/...' or 'jar:file:/...!/' URLs
*/
public JarArchive(ClassLoader loader, URL url){
// if (!"jar".equals(url.getProtocol())) throw new IllegalArgumentException("not a jar url: " + url);
this.loader = loader;
this.url = url;
File jarFile = null;
String jarPath;
int idx;
// Wipe out 'jar:' prefix AND '!/{...}' suffix(if any)
if("jar".equalsIgnoreCase(url.getProtocol())){
try{
jarPath = url.getPath();
url = new URL(jarPath.endsWith("!/") ?
jarPath.substring(0, jarPath.lastIndexOf("!/"))
: jarPath);
}catch(MalformedURLException ex){
throw new IllegalArgumentException(
"Please provide 'file:/...' or 'jar:file:/...!/' URL"
+ " instead of '" + FileArchive.decode(String.valueOf(url)) + "'");
}
}
try{
// handle 'file:/...' URL
if("file".equalsIgnoreCase(url.getProtocol())){
// Testing if file DOEN't exists AND trying
// substrings up to every '!/{...}' as path
idx = 0;
jarPath = FileArchive.decode(url.getPath());
for(String jp = jarPath; !(jarFile = new File(jp)).exists()
&& (idx = jarPath.indexOf("!/", idx + 1)) > 0;
jp = jarPath.substring(0, idx)){}
// All substrings attempted, but referenced file wasn't discovered
if(!jarFile.exists()){
// To be caught later and wrapped into IllegalStateEx - default behavior
throw new FileNotFoundException(FileArchive.decode(String.valueOf(url)));
}
}else{
throw new IllegalArgumentException(
"Please provide 'file:/...' or 'jar:file:/...!/' URL"
+ " instead of '" + FileArchive.decode(String.valueOf(url)) + "'");
}
jar = new JarFile(jarFile);
}catch(IOException e){
throw new IllegalStateException("Cannot open jar(zip) '"
+ jarFile != null ? // why can it be null? but since compiler thinks so...
jarFile.getAbsolutePath()
: FileArchive.decode(String.valueOf(url)) + "'", e);
}
}
public URL getUrl() {
return url;
}
public InputStream getBytecode(String className) throws IOException, ClassNotFoundException {
int pos = className.indexOf("<");
if (pos > -1) {
className = className.substring(0, pos);
}
pos = className.indexOf(">");
if (pos > -1) {
className = className.substring(0, pos);
}
if (!className.endsWith(".class")) {
className = className.replace('.', '/') + ".class";
}
ZipEntry entry = jar.getEntry(className);
if (entry == null) throw new ClassNotFoundException(className);
return jar.getInputStream(entry);
}
public Class loadClass(String className) throws ClassNotFoundException {
// assume the loader knows how to handle mjar release if activated
return loader.loadClass(className);
}
public Iterator iterator() {
return new JarIterator();
}
@Override
public void close() throws Exception {
jar.close();
}
private class JarIterator implements Iterator {
private final Iterator stream;
private Entry next;
private JarIterator() {
final Enumeration entries = jar.entries();
try {
final Manifest manifest = jar.getManifest();
if (manifest != null) {
mjar.load(manifest);
}
} catch (IOException e) {
// no-op
}
if (mjar.isMjar()) { // sort it to ensure we browse META-INF/versions first
final List list = new ArrayList(Collections.list(entries));
Collections.sort(list, new Comparator() {
public int compare(JarEntry o1, JarEntry o2) {
final String n2 = o2.getName();
final String n1 = o1.getName();
final boolean n1v = n1.startsWith("META-INF/versions/");
final boolean n2v = n2.startsWith("META-INF/versions/");
if (n1v && n2v) {
return n1.compareTo(n2);
}
if (n1v) {
return -1;
}
if (n2v) {
return 1;
}
try {
return Integer.parseInt(n2) - Integer.parseInt(n1);
} catch (final NumberFormatException nfe) {
return n2.compareTo(n1);
}
}
});
stream = list.iterator();
} else {
stream = Collections.list(entries).iterator();
}
}
private boolean advance() {
if (next != null) {
return true;
}
while (stream.hasNext()) {
final JarEntry entry = stream.next();
final String entryName = entry.getName();
if (entry.isDirectory() || !entryName.endsWith(".class") || entryName.endsWith("module-info.class")) {
continue;
}
String className = entryName;
if (entryName.endsWith(".class")) {
className = className.substring(0, className.length() - 6);
}
if (className.contains(".")) {
continue;
}
if (entryName.startsWith("META-INF/versions/")) { // JarFile will handle it for us
continue;
}
next = new ClassEntry(entry, className.replace('/', '.'));
return true;
}
return false;
}
public boolean hasNext() {
return advance();
}
public Entry next() {
if (!hasNext()) throw new NoSuchElementException();
Entry entry = next;
next = null;
return entry;
}
public void remove() {
throw new UnsupportedOperationException("remove");
}
private class ClassEntry implements Entry {
private final String name;
private final JarEntry entry;
private ClassEntry(JarEntry entry, String name) {
this.name = name;
this.entry = entry;
}
public String getName() {
return name;
}
public InputStream getBytecode() throws IOException {
try {
if (mjar.isMjar()) {
// JarFile handles it for us :)
final ZipEntry entry = jar.getJarEntry(this.entry.getName());
if (entry != null) {
return jar.getInputStream(entry);
}
}
return jar.getInputStream(entry);
} catch (RuntimeException e) {
throw new RuntimeException("Cannot read '" + name + " from " + jar.getName() + "'", e);
} catch (IOException e) {
throw new IOException("Cannot read '" + name + " from " + jar.getName() + "'", e);
}
}
}
}
}