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	/*
	* Copyright (c) 1994, 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 sun.tools.java;

	import java.util.Enumeration;
	import java.util.Hashtable;
	import java.io.File;
	import java.io.IOException;
	import java.util.zip.*;

	/**
	* This class is used to represent a class path, which can contain both
	* directories and zip files.
	*
	* WARNING: The contents of this source file are not part of any
	* supported API. Code that depends on them does so at its own risk:
	* they are subject to change or removal without notice.
	*/
	public
	class ClassPath {
	static final char dirSeparator = File.pathSeparatorChar;

	/**
	* The original class path string
	*/
	String pathstr;

	/**
	* List of class path entries
	*/
	private ClassPathEntry[] path;

	/**
	* Build a class path from the specified path string
	*/
	public ClassPath(String pathstr) {
	init(pathstr);
	}

	/**
	* Build a class path from the specified array of class path
	* element strings. This constructor, and the corresponding
	* "init" method, were added as part of the fix for 6473331, which
	* adds support for Class-Path manifest entries in JAR files to
	* rmic. It is conceivable that the value of a Class-Path
	* manifest entry will contain a path separator, which would cause
	* incorrect behavior if the expanded path were passed to the
	* previous constructor as a single path-separator-delimited
	* string; use of this constructor avoids that problem.
	*/
	public ClassPath(String[] patharray) {
	init(patharray);
	}

	/**
	* Build a default class path from the path strings specified by
	* the properties sun.boot.class.path and env.class.path, in that
	* order.
	*/
	public ClassPath() {
	String syscp = System.getProperty("sun.boot.class.path");
	String envcp = System.getProperty("env.class.path");
	if (envcp == null) envcp = ".";
	String cp = syscp + File.pathSeparator + envcp;
	init(cp);
	}

	private void init(String pathstr) {
	int i, j, n;
	// Save original class path string
	this.pathstr = pathstr;

	if (pathstr.length() == 0) {
	this.path = new ClassPathEntry[0];
	}

	// Count the number of path separators
	i = n = 0;
	while ((i = pathstr.indexOf(dirSeparator, i)) != -1) {
	n++; i++;
	}
	// Build the class path
	ClassPathEntry[] path = new ClassPathEntry[n+1];
	int len = pathstr.length();
	for (i = n = 0; i < len; i = j + 1) {
	if ((j = pathstr.indexOf(dirSeparator, i)) == -1) {
	j = len;
	}
	if (i == j) {
	path[n] = new ClassPathEntry();
	path[n++].dir = new File(".");
	} else {
	File file = new File(pathstr.substring(i, j));
	if (file.isFile()) {
	try {
	ZipFile zip = new ZipFile(file);
	path[n] = new ClassPathEntry();
	path[n++].zip = zip;
	} catch (ZipException e) {
	} catch (IOException e) {
	// Ignore exceptions, at least for now...
	}
	} else {
	path[n] = new ClassPathEntry();
	path[n++].dir = file;
	}
	}
	}
	// Trim class path to exact size
	this.path = new ClassPathEntry[n];
	System.arraycopy((Object)path, 0, (Object)this.path, 0, n);
	}

	private void init(String[] patharray) {
	// Save original class path string
	if (patharray.length == 0) {
	this.pathstr = "";
	} else {
	StringBuilder sb = new StringBuilder(patharray[0]);
	for (int i = 1; i < patharray.length; i++) {
	sb.append(File.pathSeparatorChar);
	sb.append(patharray[i]);
	}
	this.pathstr = sb.toString();
	}

	// Build the class path
	ClassPathEntry[] path = new ClassPathEntry[patharray.length];
	int n = 0;
	for (String name : patharray) {
	File file = new File(name);
	if (file.isFile()) {
	try {
	ZipFile zip = new ZipFile(file);
	path[n] = new ClassPathEntry();
	path[n++].zip = zip;
	} catch (ZipException e) {
	} catch (IOException e) {
	// Ignore exceptions, at least for now...
	}
	} else {
	path[n] = new ClassPathEntry();
	path[n++].dir = file;
	}
	}
	// Trim class path to exact size
	this.path = new ClassPathEntry[n];
	System.arraycopy((Object)path, 0, (Object)this.path, 0, n);
	}

	/**
	* Find the specified directory in the class path
	*/
	public ClassFile getDirectory(String name) {
	return getFile(name, true);
	}

	/**
	* Load the specified file from the class path
	*/
	public ClassFile getFile(String name) {
	return getFile(name, false);
	}

	private final String fileSeparatorChar = "" + File.separatorChar;

	private ClassFile getFile(String name, boolean isDirectory) {
	String subdir = name;
	String basename = "";
	if (!isDirectory) {
	int i = name.lastIndexOf(File.separatorChar);
	subdir = name.substring(0, i + 1);
	basename = name.substring(i + 1);
	} else if (!subdir.equals("")
	&& !subdir.endsWith(fileSeparatorChar)) {
	// zip files are picky about "foo" vs. "foo/".
	// also, the getFiles caches are keyed with a trailing /
	subdir = subdir + File.separatorChar;
	name = subdir; // Note: isDirectory==true & basename==""
	}
	for (int i = 0; i < path.length; i++) {
	if (path[i].zip != null) {
	String newname = name.replace(File.separatorChar, '/');
	ZipEntry entry = path[i].zip.getEntry(newname);
	if (entry != null) {
	return new ClassFile(path[i].zip, entry);
	}
	} else {
	File file = new File(path[i].dir.getPath(), name);
	String list[] = path[i].getFiles(subdir);
	if (isDirectory) {
	if (list.length > 0) {
	return new ClassFile(file);
	}
	} else {
	for (int j = 0; j < list.length; j++) {
	if (basename.equals(list[j])) {
	// Don't bother checking !file.isDir,
	// since we only look for names which
	// cannot already be packages (foo.java, etc).
	return new ClassFile(file);
	}
	}
	}
	}
	}
	return null;
	}

	/**
	* Returns list of files given a package name and extension.
	*/
	public Enumeration getFiles(String pkg, String ext) {
	Hashtable files = new Hashtable();
	for (int i = path.length; --i >= 0; ) {
	if (path[i].zip != null) {
	Enumeration e = path[i].zip.entries();
	while (e.hasMoreElements()) {
	ZipEntry entry = (ZipEntry)e.nextElement();
	String name = entry.getName();
	name = name.replace('/', File.separatorChar);
	if (name.startsWith(pkg) && name.endsWith(ext)) {
	files.put(name, new ClassFile(path[i].zip, entry));
	}
	}
	} else {
	String[] list = path[i].getFiles(pkg);
	for (int j = 0; j < list.length; j++) {
	String name = list[j];
	if (name.endsWith(ext)) {
	name = pkg + File.separatorChar + name;
	File file = new File(path[i].dir.getPath(), name);
	files.put(name, new ClassFile(file));
	}
	}
	}
	}
	return files.elements();
	}

	/**
	* Release resources.
	*/
	public void close() throws IOException {
	for (int i = path.length; --i >= 0; ) {
	if (path[i].zip != null) {
	path[i].zip.close();
	}
	}
	}

	/**
	* Returns original class path string
	*/
	public String toString() {
	return pathstr;
	}
	}

	/**
	* A class path entry, which can either be a directory or an open zip file.
	*/
	class ClassPathEntry {
	File dir;
	ZipFile zip;

	Hashtable subdirs = new Hashtable(29); // cache of sub-directory listings
	String[] getFiles(String subdir) {
	String files[] = (String[]) subdirs.get(subdir);
	if (files == null) {
	// search the directory, exactly once
	File sd = new File(dir.getPath(), subdir);
	if (sd.isDirectory()) {
	files = sd.list();
	if (files == null) {
	// should not happen, but just in case, fail silently
	files = new String[0];
	}
	if (files.length == 0) {
	String nonEmpty[] = { "" };
	files = nonEmpty;
	}
	} else {
	files = new String[0];
	}
	subdirs.put(subdir, files);
	}
	return files;
	}

	}

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