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	/*
	* Copyright (c) 1999, 2016, 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 sun.misc;

	import java.io.*;
	import java.security.AccessController;
	import java.util.*;
	import java.util.jar.*;
	import java.util.zip.*;
	import sun.security.action.GetPropertyAction;

	/**
	* 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<String,LinkedList<String>> indexMap;

	/**
	* The hash map that maintains mappings from
	* jar file to package/class/resource lists
	*/
	private HashMap<String,LinkedList<String>> 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(AccessController.doPrivileged(
	new GetPropertyAction("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 <code>null</code> if none.
	*
	* This single parameter version of the method is retained
	* for binary compatibility with earlier releases.
	*
	* @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 {
	return getJarIndex(jar, null);
	}

	/**
	* Returns the jar index, or <code>null</code> 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, MetaIndex metaIndex) throws IOException {
	JarIndex index = null;
	/* If metaIndex is not null, check the meta index to see
	if META-INF/INDEX.LIST is contained in jar file or not.
	*/
	if (metaIndex != null &&
	!metaIndex.mayContain(INDEX_NAME)) {
	return 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<String,LinkedList<String>> t) {
	LinkedList<String> 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<String> get(String fileName) {
	LinkedList<String> 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<? extends ZipEntry> 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))
	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<String> jarlist = jarMap.get(jar);
	if (jarlist != null) {
	Iterator<String> 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<String> 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<Map.Entry<String,LinkedList<String>>> itr = indexMap.entrySet().iterator();
	while(itr.hasNext()) {
	Map.Entry<String,LinkedList<String>> e = itr.next();
	String packageName = e.getKey();
	LinkedList<String> from_list = e.getValue();
	Iterator<String> listItr = from_list.iterator();
	while(listItr.hasNext()) {
	String jarName = listItr.next();
	if (path != null) {
	jarName = path.concat(jarName);
	}
	toIndex.addMapping(packageName, jarName);
	}
	}
	}
	}

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