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/*
* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.internal.util.jar;
import java.io.*;
import java.util.*;
import java.util.jar.*;
import java.util.zip.*;
import static sun.security.action.GetPropertyAction.privilegedGetProperty;
/**
* This class is used to maintain mappings from packages, classes
* and resources to their enclosing JAR files. Mappings are kept
* at the package level except for class or resource files that
* are located at the root directory. URLClassLoader uses the mapping
* information to determine where to fetch an extension class or
* resource from.
*
* @author Zhenghua Li
* @since 1.3
*/
public class JarIndex {
/**
* The hash map that maintains mappings from
* package/classe/resource to jar file list(s)
*/
private HashMap> indexMap;
/**
* The hash map that maintains mappings from
* jar file to package/class/resource lists
*/
private HashMap> jarMap;
/*
* An ordered list of jar file names.
*/
private String[] jarFiles;
/**
* The index file name.
*/
public static final String INDEX_NAME = "META-INF/INDEX.LIST";
/**
* true if, and only if, sun.misc.JarIndex.metaInfFilenames is set to true.
* If true, the names of the files in META-INF, and its subdirectories, will
* be added to the index. Otherwise, just the directory names are added.
*/
private static final boolean metaInfFilenames =
"true".equals(privilegedGetProperty("sun.misc.JarIndex.metaInfFilenames"));
/**
* Constructs a new, empty jar index.
*/
public JarIndex() {
indexMap = new HashMap<>();
jarMap = new HashMap<>();
}
/**
* Constructs a new index from the specified input stream.
*
* @param is the input stream containing the index data
*/
public JarIndex(InputStream is) throws IOException {
this();
read(is);
}
/**
* Constructs a new index for the specified list of jar files.
*
* @param files the list of jar files to construct the index from.
*/
public JarIndex(String[] files) throws IOException {
this();
this.jarFiles = files;
parseJars(files);
}
/**
* Returns the jar index, or null if none.
*
* @param jar the JAR file to get the index from.
* @exception IOException if an I/O error has occurred.
*/
public static JarIndex getJarIndex(JarFile jar) throws IOException {
JarIndex index = null;
JarEntry e = jar.getJarEntry(INDEX_NAME);
// if found, then load the index
if (e != null) {
index = new JarIndex(jar.getInputStream(e));
}
return index;
}
/**
* Returns the jar files that are defined in this index.
*/
public String[] getJarFiles() {
return jarFiles;
}
/*
* Add the key, value pair to the hashmap, the value will
* be put in a linked list which is created if necessary.
*/
private void addToList(String key, String value,
HashMap> t) {
LinkedList list = t.get(key);
if (list == null) {
list = new LinkedList<>();
list.add(value);
t.put(key, list);
} else if (!list.contains(value)) {
list.add(value);
}
}
/**
* Returns the list of jar files that are mapped to the file.
*
* @param fileName the key of the mapping
*/
public LinkedList get(String fileName) {
LinkedList jarFiles = null;
if ((jarFiles = indexMap.get(fileName)) == null) {
/* try the package name again */
int pos;
if((pos = fileName.lastIndexOf('/')) != -1) {
jarFiles = indexMap.get(fileName.substring(0, pos));
}
}
return jarFiles;
}
/**
* Add the mapping from the specified file to the specified
* jar file. If there were no mapping for the package of the
* specified file before, a new linked list will be created,
* the jar file is added to the list and a new mapping from
* the package to the jar file list is added to the hashmap.
* Otherwise, the jar file will be added to the end of the
* existing list.
*
* @param fileName the file name
* @param jarName the jar file that the file is mapped to
*
*/
public void add(String fileName, String jarName) {
String packageName;
int pos;
if((pos = fileName.lastIndexOf('/')) != -1) {
packageName = fileName.substring(0, pos);
} else {
packageName = fileName;
}
addMapping(packageName, jarName);
}
/**
* Same as add(String,String) except that it doesn't strip off from the
* last index of '/'. It just adds the jarItem (filename or package)
* as it is received.
*/
private void addMapping(String jarItem, String jarName) {
// add the mapping to indexMap
addToList(jarItem, jarName, indexMap);
// add the mapping to jarMap
addToList(jarName, jarItem, jarMap);
}
/**
* Go through all the jar files and construct the
* index table.
*/
private void parseJars(String[] files) throws IOException {
if (files == null) {
return;
}
String currentJar = null;
for (int i = 0; i < files.length; i++) {
currentJar = files[i];
ZipFile zrf = new ZipFile(currentJar.replace
('/', File.separatorChar));
Enumeration entries = zrf.entries();
while(entries.hasMoreElements()) {
ZipEntry entry = entries.nextElement();
String fileName = entry.getName();
// Skip the META-INF directory, the index, and manifest.
// Any files in META-INF/ will be indexed explicitly
if (fileName.equals("META-INF/") ||
fileName.equals(INDEX_NAME) ||
fileName.equals(JarFile.MANIFEST_NAME) ||
fileName.startsWith("META-INF/versions/"))
continue;
if (!metaInfFilenames || !fileName.startsWith("META-INF/")) {
add(fileName, currentJar);
} else if (!entry.isDirectory()) {
// Add files under META-INF explicitly so that certain
// services, like ServiceLoader, etc, can be located
// with greater accuracy. Directories can be skipped
// since each file will be added explicitly.
addMapping(fileName, currentJar);
}
}
zrf.close();
}
}
/**
* Writes the index to the specified OutputStream
*
* @param out the output stream
* @exception IOException if an I/O error has occurred
*/
public void write(OutputStream out) throws IOException {
BufferedWriter bw = new BufferedWriter
(new OutputStreamWriter(out, "UTF8"));
bw.write("JarIndex-Version: 1.0\n\n");
if (jarFiles != null) {
for (int i = 0; i < jarFiles.length; i++) {
/* print out the jar file name */
String jar = jarFiles[i];
bw.write(jar + "\n");
LinkedList jarlist = jarMap.get(jar);
if (jarlist != null) {
Iterator listitr = jarlist.iterator();
while(listitr.hasNext()) {
bw.write(listitr.next() + "\n");
}
}
bw.write("\n");
}
bw.flush();
}
}
/**
* Reads the index from the specified InputStream.
*
* @param is the input stream
* @exception IOException if an I/O error has occurred
*/
public void read(InputStream is) throws IOException {
BufferedReader br = new BufferedReader
(new InputStreamReader(is, "UTF8"));
String line = null;
String currentJar = null;
/* an ordered list of jar file names */
Vector jars = new Vector<>();
/* read until we see a .jar line */
while((line = br.readLine()) != null && !line.endsWith(".jar"));
for(;line != null; line = br.readLine()) {
if (line.length() == 0)
continue;
if (line.endsWith(".jar")) {
currentJar = line;
jars.add(currentJar);
} else {
String name = line;
addMapping(name, currentJar);
}
}
jarFiles = jars.toArray(new String[jars.size()]);
}
/**
* Merges the current index into another index, taking into account
* the relative path of the current index.
*
* @param toIndex The destination index which the current index will
* merge into.
* @param path The relative path of the this index to the destination
* index.
*
*/
public void merge(JarIndex toIndex, String path) {
Iterator>> itr = indexMap.entrySet().iterator();
while(itr.hasNext()) {
Map.Entry> e = itr.next();
String packageName = e.getKey();
LinkedList from_list = e.getValue();
Iterator listItr = from_list.iterator();
while(listItr.hasNext()) {
String jarName = listItr.next();
if (path != null) {
jarName = path.concat(jarName);
}
toIndex.addMapping(packageName, jarName);
}
}
}
}