org.eclipse.help.base/src/org/eclipse/help/internal/protocols/HelpURLConnection.java - platform/eclipse.platform.ua - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2014 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.help.internal.protocols;

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.net.URLConnection;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.Hashtable;
 import java.util.Locale;
 import java.util.StringTokenizer;
 import java.util.Vector;

 import org.eclipse.core.runtime.IConfigurationElement;
 import org.eclipse.core.runtime.IExtension;
 import org.eclipse.core.runtime.IExtensionPoint;
 import org.eclipse.core.runtime.IExtensionRegistry;
 import org.eclipse.core.runtime.IProduct;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.help.internal.base.remote.HttpsUtility;
 import org.eclipse.help.internal.base.remote.PreferenceFileHandler;
 import org.eclipse.help.internal.base.remote.RemoteContentLocator;
 import org.eclipse.help.internal.base.remote.RemoteHelp;
 import org.eclipse.help.internal.base.remote.RemoteHelpInputStream;
 import org.eclipse.help.internal.base.util.ProxyUtil;
 import org.eclipse.help.internal.util.ResourceLocator;
 import org.eclipse.help.internal.util.URLCoder;
 import org.osgi.framework.Bundle;

 /**
  * URLConnection to help documents in plug-ins
  */
 public class HelpURLConnection extends URLConnection {

 	private final static String PARAM_LANG = "lang"; //$NON-NLS-1$
 	private final static String PRODUCT_PLUGIN = "PRODUCT_PLUGIN"; //$NON-NLS-1$
 	public final static String PLUGINS_ROOT = "PLUGINS_ROOT/"; //$NON-NLS-1$
 	private final static String PATH_RTOPIC = "/rtopic"; //$NON-NLS-1$
 	private static final String PROTOCOL_HTTP = "http://"; //$NON-NLS-1$

 	private static Hashtable<String, String[]> templates = new Hashtable<String, String[]>();

 	// document caching - disabled if running in dev mode
 	protected static boolean cachingEnabled = true;
 	static {
 		String[] args = Platform.getCommandLineArgs();
 		for (int i = 0; i < args.length; i++) {
 			if ("-dev".equals(args[i])) { //$NON-NLS-1$
 				cachingEnabled = false;
 				break;
 			}
 		}
 	}

 	protected String pluginAndFile; // plugin/file
 	protected String query; // after ?
 	protected HashMap<String, Object> arguments;
 	protected Bundle plugin;
 	// file in a plug-in
 	protected String file;
 	protected String locale;
 	private static String appserverImplPluginId;
 	private boolean localOnly;

 	/**
 	 * Constructor for HelpURLConnection
 	 */
 	public HelpURLConnection(URL url) {
 		this(url, false);
 	}

 	public HelpURLConnection(URL url, boolean localOnly) {
 		super(url);
         this.localOnly = localOnly;
 		String urlFile = url.getFile();

 		// Strip off everything before and including the PLUGINS_ROOT
 		int index = urlFile.indexOf(PLUGINS_ROOT);
 		if (index != -1)
 			urlFile = urlFile.substring(index + PLUGINS_ROOT.length());
 		// Strip off the leading "/" and the query
 		if (urlFile.startsWith("/")) //$NON-NLS-1$
 			urlFile = urlFile.substring(1);

 		int indx = urlFile.indexOf("?"); //$NON-NLS-1$
 		if (indx != -1) {
 			query = urlFile.substring(indx + 1);
 			urlFile = urlFile.substring(0, indx);
 		}
 		this.pluginAndFile = urlFile;
 		parseQuery();

 		setDefaultUseCaches(isCacheable());
 	}

 	/**
 	 * @see URLConnection#connect()
 	 */
 	public void connect() throws IOException {
 	}

 	/**
 	 * see URLConnection#getInputStream(); Note: this method can throw IOException, but should never
 	 * return null
 	 */
 	public InputStream getInputStream() throws IOException {
 		// must override parent implementation, since it does nothing.
 		Bundle plugin = getPlugin();
 		if (plugin != null && plugin.getSymbolicName().equals(getAppserverImplPluginId())) {
 			// Do not return documents from app server implementation plug-in
 			throw new IOException("Resource not found."); //$NON-NLS-1$
 		}

 		if (getFile() == null || "".equals(getFile()) || getFile().indexOf("..\\") >= 0) { //$NON-NLS-1$ //$NON-NLS-2$
 			throw new IOException("Resource not found."); //$NON-NLS-1$
 		}

 		int helpOption=localOnly ? PreferenceFileHandler.LOCAL_HELP_ONLY
 			: PreferenceFileHandler.getEmbeddedHelpOption();
 		InputStream in = null;
 		if (plugin != null && (helpOption==PreferenceFileHandler.LOCAL_HELP_ONLY || helpOption==PreferenceFileHandler.LOCAL_HELP_PRIORITY)) {
 			in = getLocalHelp(plugin);
 		}
         if (in == null && (helpOption==PreferenceFileHandler.LOCAL_HELP_PRIORITY || helpOption==PreferenceFileHandler.REMOTE_HELP_PRIORITY)) {

         	in = openFromRemoteServer(getHref(), getLocale());
         	if( in != null ){
         		in = new RemoteHelpInputStream(in);
         	}
         	if(in==null && plugin!=null && helpOption==PreferenceFileHandler.REMOTE_HELP_PRIORITY)
         	{
         		in = getLocalHelp(plugin);
         	}
 		}
 		if (in == null) {
 			throw new IOException("Resource not found."); //$NON-NLS-1$
 		}
 		return in;
 	}

 	private InputStream getLocalHelp(Bundle plugin) {
 		InputStream in;
 		// first try using content provider, then try to find the file
 		// inside doc.zip, and finally try the file system
 		in = ResourceLocator.openFromProducer(plugin,
 				query == null ? getFile() : getFile() + "?" + query, //$NON-NLS-1$
 				getLocale());

 		if (in == null) {
 			in = ResourceLocator.openFromPlugin(plugin, getFile(), getLocale());
 		}
 		if (in == null) {
 			in = ResourceLocator.openFromZip(plugin, "doc.zip", //$NON-NLS-1$
 					getFile(), getLocale());
 		}
 		return in;
 	}

 	public long getExpiration() {
 		return isCacheable() ? new Date().getTime() + 10000 : 0;
 	}

 	public static void parseQuery(String query, HashMap<String, Object> arguments) {
 		StringTokenizer stok = new StringTokenizer(query, "&"); //$NON-NLS-1$
 		while (stok.hasMoreTokens()) {
 			String aQuery = stok.nextToken();
 			int equalsPosition = aQuery.indexOf("="); //$NON-NLS-1$
 			if (equalsPosition > -1) { // well formed name/value pair
 				String arg = aQuery.substring(0, equalsPosition);
 				String val = aQuery.substring(equalsPosition + 1);
 				Object existing = arguments.get(arg);
 				if (existing == null)
 					arguments.put(arg, val);
 				else if (existing instanceof Vector) {
 					@SuppressWarnings("unchecked")
 					Vector<String> vector = (Vector<String>) existing;
 					vector.add(val);
 					arguments.put(arg, existing);
 				} else {
 					Vector<Object> v = new Vector<Object>(2);
 					v.add(existing);
 					v.add(val);
 					arguments.put(arg, v);
 				}
 			}
 		}
 	}

 	/**
 	 * NOTE: need to add support for multi-valued parameters (like filtering) Multiple values are
 	 * added as vectors
 	 */
 	protected void parseQuery() {
 		if (query != null && !"".equals(query)) { //$NON-NLS-1$
 			if (arguments == null) {
 				arguments = new HashMap<String, Object>(5);
 			}
 			parseQuery(query, arguments);
 		}
 	}

 	public String getContentType() {
 		// Check if the file is hypertext or plain text
 		String file = pluginAndFile.toLowerCase(Locale.US);
 		if (file.endsWith(".html") || file.endsWith(".htm") //$NON-NLS-1$ //$NON-NLS-2$
 				|| file.endsWith(".xhtml")) //$NON-NLS-1$
 			return "text/html"; //$NON-NLS-1$
 		else if (file.endsWith(".css")) //$NON-NLS-1$
 			return "text/css"; //$NON-NLS-1$
 		else if (file.endsWith(".gif")) //$NON-NLS-1$
 			return "image/gif"; //$NON-NLS-1$
 		else if (file.endsWith(".jpg")) //$NON-NLS-1$
 			return "image/jpeg"; //$NON-NLS-1$
 		else if (file.endsWith(".pdf")) //$NON-NLS-1$
 			return "application/pdf"; //$NON-NLS-1$
 		else if (file.endsWith(".xml")) //$NON-NLS-1$
 			return "application/xml"; //$NON-NLS-1$
 		else if (file.endsWith(".xsl")) //$NON-NLS-1$
 			return "application/xsl"; //$NON-NLS-1$
 		return "text/plain"; //$NON-NLS-1$
 	}

 	/**
 	 *
 	 */
 	public Vector<String> getMultiValue(String name) {
 		if (arguments != null) {
 			Object value = arguments.get(name);
 			if (value instanceof Vector) {
 				@SuppressWarnings("unchecked")
 				Vector<String> vector = (Vector<String>) value;
 				return vector;
 			}
 			return null;
 		}
 		return null;
 	}

 	/**
 	 *
 	 */
 	public String getValue(String name) {
 		if (arguments == null)
 			return null;
 		Object value = arguments.get(name);
 		String stringValue = null;
 		if (value instanceof String)
 			stringValue = (String) value;
 		else if (value instanceof Vector) {
 			@SuppressWarnings("unchecked")
 			Vector<String> vector = (Vector<String>) value;
 			stringValue = vector.firstElement();
 		} else
 			return null;
 		try {
 			return URLCoder.decode(stringValue);
 		} catch (Exception e) {
 			return null;
 		}

 	}

 	/**
 	 * Returns the locale specified by client.
 	 */
 	protected String getLocale() {
 		if (locale == null) {
 			locale = getValue(PARAM_LANG);
 			if (locale == null) {
 				locale = Platform.getNL();
 			}
 		}
 		return locale;
 	}

 	protected String getFile() {
 		if (file == null) {
 			// Strip the plugin id
 			int start = pluginAndFile.indexOf("/") + 1; //$NON-NLS-1$
 			// Strip query string or anchor bookmark
 			int end = pluginAndFile.indexOf("?"); //$NON-NLS-1$
 			if (end == -1)
 				end = pluginAndFile.indexOf("#"); //$NON-NLS-1$
 			if (end == -1)
 				end = pluginAndFile.length();
 			file = pluginAndFile.substring(start, end);
 			file = URLCoder.decode(file);
 		}
 		return file;
 	}

 	protected Bundle getPlugin() {
 		if (plugin == null) {
 			// Assume the url is pluginID/path_to_topic.html
 			int i = pluginAndFile.indexOf('/');
 			String pluginId = i == -1 ? "" : pluginAndFile.substring(0, i); //$NON-NLS-1$
 			pluginId = URLCoder.decode(pluginId);
 			if (PRODUCT_PLUGIN.equals(pluginId)) {
 				IProduct product = Platform.getProduct();
 				if (product != null) {
 					plugin = product.getDefiningBundle();
 					return plugin;
 				}
 			}
 			plugin = Platform.getBundle(pluginId);
 		}
 		return plugin;
 	}

 	private String getHref() {
 		return '/' + pluginAndFile;
 	}

 	public boolean isCacheable() {
 		if (getValue("resultof") != null) //$NON-NLS-1$
 			return false;
 		return cachingEnabled;
 	}

 	public String toString() {
 		return pluginAndFile;
 	}

 	/**
 	 * Obtains ID of plugin that contributes appserver implementation. *
 	 *
 	 * @return plug-in ID or null
 	 */
 	private static String getAppserverImplPluginId() {
 		if (appserverImplPluginId == null) {

 			// This part mimics AppserverPlugin.createWebappServer()

 			// get the app server extension from the system plugin registry
 			IExtensionRegistry pluginRegistry = Platform.getExtensionRegistry();
 			IExtensionPoint point = pluginRegistry.getExtensionPoint("org.eclipse.help.appserver.server"); //$NON-NLS-1$
 			if (point != null) {
 				IExtension[] extensions = point.getExtensions();
 				if (extensions.length != 0) {
 					// We need to pick up the non-default configuration
 					IConfigurationElement[] elements = extensions[0].getConfigurationElements();
 					if (elements.length == 0)
 						return null;
 					IConfigurationElement serverElement = null;
 					for (int i = 0; i < elements.length; i++) {
 						String defaultValue = elements[i].getAttribute("default"); //$NON-NLS-1$
 						if (defaultValue == null || defaultValue.equals("false")) { //$NON-NLS-1$
 							serverElement = elements[i];
 							break;
 						}
 					}
 					// if all the servers are default, then pick the first one
 					if (serverElement == null) {
 						serverElement = elements[0];
 					}
 					//

 					appserverImplPluginId = serverElement.getContributor().getName();

 				}
 			}
 		}
 		return appserverImplPluginId;
 	}

 	/*
 	 * Opens a connection to the document on the remote help server, if one was specified. If the
 	 * document doesn't exist on the remote server, returns null.
 	 */
 	private InputStream openFromRemoteServer(String href, String locale) {
 		if (RemoteHelp.isEnabled()) {

 			String pathSuffix = PATH_RTOPIC + href + '?' + PARAM_LANG + '=' + locale;

 			/*
 			 * Get the URL that maps to the contributorID Assume the url is
 			 * pluginID/path_to_topic.html
 			 */
 			int i = pluginAndFile.indexOf('/');
 			String pluginId = i == -1 ? "" : pluginAndFile.substring(0, i); //$NON-NLS-1$
 			pluginId = URLCoder.decode(pluginId);

 			String remoteURL = RemoteContentLocator.getUrlForContent(pluginId);

 			InputStream in;
 			if (remoteURL == null) {
 				in = tryOpeningAllServers(pathSuffix);
 			} else {
 			    in = openRemoteStream(remoteURL, pathSuffix);
 			}

 			return in;
 		}
 		return null;
 	}

 	private InputStream getUnverifiedStream(String remoteURL,String pathSuffix)
 	{
 		URL url;
 		InputStream in = null;
 		try {

 			if(remoteURL.startsWith(PROTOCOL_HTTP))
 			{
 				url = new URL(remoteURL + pathSuffix);
 				HttpURLConnection connection = (HttpURLConnection) ProxyUtil.getConnection(url);
 				in = connection.getInputStream();
 			}
 			else
 			{
 				url = HttpsUtility.getHttpsURL(remoteURL + pathSuffix);
 				in = HttpsUtility.getHttpsStream(url);
 			}

 		} catch (Exception e) {
 			// File not found on this server
 		}
 		return in;
 	}


 	private InputStream openRemoteStream(String remoteURL, String pathSuffix)  {
 		InputStream in = getUnverifiedStream(remoteURL,pathSuffix);

 		String errPage[] = templates.get(remoteURL);
 		if (errPage==null)
 		{
 			String error = getPageText(getUnverifiedStream(remoteURL,"/rtopic/fakeurltogetatestpage/_ACEGIKMOQ246.html")); //$NON-NLS-1$
 			if (error!=null)
 			{
 				errPage = error.split("\n"); //$NON-NLS-1$
 				templates.put(remoteURL,errPage);
 			}
 			else
 			{
 				errPage = new String[0];
 				templates.put(remoteURL,errPage);
 			}
 		}


 		// No error page, InfoCenter is at least 3.6, so it is
 		// returning null already.
 		if (errPage.length==0)
 			return in;

 		// Check to see if the URL is the error page for the
 		// remote IC.  If so, return null.
 		if (compare(errPage,getUnverifiedStream(remoteURL,pathSuffix)))
 		{
 			try{
 				in.close();
 			}catch(Exception ex){}
 			return null;
 		}
 		return in;
 	}

 	private boolean compare(String lines[],InputStream in)
 	{
 		try{
 			if (in!=null)
 			{
 				BufferedReader br = new BufferedReader(new InputStreamReader(in));
 				String line;
 				int count = 0;

 				while ((line = br.readLine())!=null)
 				{
 					if (count>lines.length)
 						return false;

 					if (!lines[count].equals(line))
 						return false;
 					count++;
 				}
 				br.close();
 				in.close();
 				return true;
 			}
 		}catch(Exception ex)
 		{}
 		return false;
 	}

 	private String getPageText(InputStream in) {
 		try{
 			if (in!=null)
 			{
 				BufferedReader br = new BufferedReader(new InputStreamReader(in));
 				String line,result=""; //$NON-NLS-1$

 				while ((line = br.readLine())!=null)
 				{
 					result+=line+'\n';
 				}
 				br.close();
 				in.close();
 				return result;
 			}
 		}catch(Exception ex){}

 		return null;
 	}

 	private InputStream tryOpeningAllServers(String pathSuffix) {
 		PreferenceFileHandler prefHandler = new PreferenceFileHandler();
 		String host[] = prefHandler.getHostEntries();
 		String port[] = prefHandler.getPortEntries();
 		String protocol[] = prefHandler.getProtocolEntries();
 		String path[] = prefHandler.getPathEntries();
 		String isEnabled[] = prefHandler.isEnabled();

 		int numICs = host.length;

 		for (int i = 0; i < numICs; i++) {
 			if (isEnabled[i].equalsIgnoreCase("true")) { //$NON-NLS-1$
 				String urlStr = protocol[i]+"://" + host[i] + ':' + port[i] + path[i]; //$NON-NLS-1$
 				InputStream is = openRemoteStream(urlStr, pathSuffix);
 				if (is != null) {
 					return is;
 				}
 			}
 		}
 		return null;
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2000, 2014 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.help.internal.protocols;

	import java.io.BufferedReader;
	import java.io.IOException;
	import java.io.InputStream;
	import java.io.InputStreamReader;
	import java.net.HttpURLConnection;
	import java.net.URL;
	import java.net.URLConnection;
	import java.util.Date;
	import java.util.HashMap;
	import java.util.Hashtable;
	import java.util.Locale;
	import java.util.StringTokenizer;
	import java.util.Vector;

	import org.eclipse.core.runtime.IConfigurationElement;
	import org.eclipse.core.runtime.IExtension;
	import org.eclipse.core.runtime.IExtensionPoint;
	import org.eclipse.core.runtime.IExtensionRegistry;
	import org.eclipse.core.runtime.IProduct;
	import org.eclipse.core.runtime.Platform;
	import org.eclipse.help.internal.base.remote.HttpsUtility;
	import org.eclipse.help.internal.base.remote.PreferenceFileHandler;
	import org.eclipse.help.internal.base.remote.RemoteContentLocator;
	import org.eclipse.help.internal.base.remote.RemoteHelp;
	import org.eclipse.help.internal.base.remote.RemoteHelpInputStream;
	import org.eclipse.help.internal.base.util.ProxyUtil;
	import org.eclipse.help.internal.util.ResourceLocator;
	import org.eclipse.help.internal.util.URLCoder;
	import org.osgi.framework.Bundle;

	/**
	* URLConnection to help documents in plug-ins
	*/
	public class HelpURLConnection extends URLConnection {

	private final static String PARAM_LANG = "lang"; //$NON-NLS-1$
	private final static String PRODUCT_PLUGIN = "PRODUCT_PLUGIN"; //$NON-NLS-1$
	public final static String PLUGINS_ROOT = "PLUGINS_ROOT/"; //$NON-NLS-1$
	private final static String PATH_RTOPIC = "/rtopic"; //$NON-NLS-1$
	private static final String PROTOCOL_HTTP = "http://"; //$NON-NLS-1$

	private static Hashtable<String, String[]> templates = new Hashtable<String, String[]>();

	// document caching - disabled if running in dev mode
	protected static boolean cachingEnabled = true;
	static {
	String[] args = Platform.getCommandLineArgs();
	for (int i = 0; i < args.length; i++) {
	if ("-dev".equals(args[i])) { //$NON-NLS-1$
	cachingEnabled = false;
	break;
	}
	}
	}

	protected String pluginAndFile; // plugin/file
	protected String query; // after ?
	protected HashMap<String, Object> arguments;
	protected Bundle plugin;
	// file in a plug-in
	protected String file;
	protected String locale;
	private static String appserverImplPluginId;
	private boolean localOnly;

	/**
	* Constructor for HelpURLConnection
	*/
	public HelpURLConnection(URL url) {
	this(url, false);
	}

	public HelpURLConnection(URL url, boolean localOnly) {
	super(url);
	this.localOnly = localOnly;
	String urlFile = url.getFile();

	// Strip off everything before and including the PLUGINS_ROOT
	int index = urlFile.indexOf(PLUGINS_ROOT);
	if (index != -1)
	urlFile = urlFile.substring(index + PLUGINS_ROOT.length());
	// Strip off the leading "/" and the query
	if (urlFile.startsWith("/")) //$NON-NLS-1$
	urlFile = urlFile.substring(1);

	int indx = urlFile.indexOf("?"); //$NON-NLS-1$
	if (indx != -1) {
	query = urlFile.substring(indx + 1);
	urlFile = urlFile.substring(0, indx);
	}
	this.pluginAndFile = urlFile;
	parseQuery();

	setDefaultUseCaches(isCacheable());
	}

	/**
	* @see URLConnection#connect()
	*/
	public void connect() throws IOException {
	}

	/**
	* see URLConnection#getInputStream(); Note: this method can throw IOException, but should never
	* return null
	*/
	public InputStream getInputStream() throws IOException {
	// must override parent implementation, since it does nothing.
	Bundle plugin = getPlugin();
	if (plugin != null && plugin.getSymbolicName().equals(getAppserverImplPluginId())) {
	// Do not return documents from app server implementation plug-in
	throw new IOException("Resource not found."); //$NON-NLS-1$
	}

	if (getFile() == null \|\| "".equals(getFile()) \|\| getFile().indexOf("..\\") >= 0) { //$NON-NLS-1$ //$NON-NLS-2$
	throw new IOException("Resource not found."); //$NON-NLS-1$
	}

	int helpOption=localOnly ? PreferenceFileHandler.LOCAL_HELP_ONLY
	: PreferenceFileHandler.getEmbeddedHelpOption();
	InputStream in = null;
	if (plugin != null && (helpOption==PreferenceFileHandler.LOCAL_HELP_ONLY \|\| helpOption==PreferenceFileHandler.LOCAL_HELP_PRIORITY)) {
	in = getLocalHelp(plugin);
	}
	if (in == null && (helpOption==PreferenceFileHandler.LOCAL_HELP_PRIORITY \|\| helpOption==PreferenceFileHandler.REMOTE_HELP_PRIORITY)) {

	in = openFromRemoteServer(getHref(), getLocale());
	if( in != null ){
	in = new RemoteHelpInputStream(in);
	}
	if(in==null && plugin!=null && helpOption==PreferenceFileHandler.REMOTE_HELP_PRIORITY)
	{
	in = getLocalHelp(plugin);
	}
	}
	if (in == null) {
	throw new IOException("Resource not found."); //$NON-NLS-1$
	}
	return in;
	}

	private InputStream getLocalHelp(Bundle plugin) {
	InputStream in;
	// first try using content provider, then try to find the file
	// inside doc.zip, and finally try the file system
	in = ResourceLocator.openFromProducer(plugin,
	query == null ? getFile() : getFile() + "?" + query, //$NON-NLS-1$
	getLocale());

	if (in == null) {
	in = ResourceLocator.openFromPlugin(plugin, getFile(), getLocale());
	}
	if (in == null) {
	in = ResourceLocator.openFromZip(plugin, "doc.zip", //$NON-NLS-1$
	getFile(), getLocale());
	}
	return in;
	}

	public long getExpiration() {
	return isCacheable() ? new Date().getTime() + 10000 : 0;
	}

	public static void parseQuery(String query, HashMap<String, Object> arguments) {
	StringTokenizer stok = new StringTokenizer(query, "&"); //$NON-NLS-1$
	while (stok.hasMoreTokens()) {
	String aQuery = stok.nextToken();
	int equalsPosition = aQuery.indexOf("="); //$NON-NLS-1$
	if (equalsPosition > -1) { // well formed name/value pair
	String arg = aQuery.substring(0, equalsPosition);
	String val = aQuery.substring(equalsPosition + 1);
	Object existing = arguments.get(arg);
	if (existing == null)
	arguments.put(arg, val);
	else if (existing instanceof Vector) {
	@SuppressWarnings("unchecked")
	Vector<String> vector = (Vector<String>) existing;
	vector.add(val);
	arguments.put(arg, existing);
	} else {
	Vector<Object> v = new Vector<Object>(2);
	v.add(existing);
	v.add(val);
	arguments.put(arg, v);
	}
	}
	}
	}

	/**
	* NOTE: need to add support for multi-valued parameters (like filtering) Multiple values are
	* added as vectors
	*/
	protected void parseQuery() {
	if (query != null && !"".equals(query)) { //$NON-NLS-1$
	if (arguments == null) {
	arguments = new HashMap<String, Object>(5);
	}
	parseQuery(query, arguments);
	}
	}

	public String getContentType() {
	// Check if the file is hypertext or plain text
	String file = pluginAndFile.toLowerCase(Locale.US);
	if (file.endsWith(".html") \|\| file.endsWith(".htm") //$NON-NLS-1$ //$NON-NLS-2$
	\|\| file.endsWith(".xhtml")) //$NON-NLS-1$
	return "text/html"; //$NON-NLS-1$
	else if (file.endsWith(".css")) //$NON-NLS-1$
	return "text/css"; //$NON-NLS-1$
	else if (file.endsWith(".gif")) //$NON-NLS-1$
	return "image/gif"; //$NON-NLS-1$
	else if (file.endsWith(".jpg")) //$NON-NLS-1$
	return "image/jpeg"; //$NON-NLS-1$
	else if (file.endsWith(".pdf")) //$NON-NLS-1$
	return "application/pdf"; //$NON-NLS-1$
	else if (file.endsWith(".xml")) //$NON-NLS-1$
	return "application/xml"; //$NON-NLS-1$
	else if (file.endsWith(".xsl")) //$NON-NLS-1$
	return "application/xsl"; //$NON-NLS-1$
	return "text/plain"; //$NON-NLS-1$
	}

	/**
	*
	*/
	public Vector<String> getMultiValue(String name) {
	if (arguments != null) {
	Object value = arguments.get(name);
	if (value instanceof Vector) {
	@SuppressWarnings("unchecked")
	Vector<String> vector = (Vector<String>) value;
	return vector;
	}
	return null;
	}
	return null;
	}

	/**
	*
	*/
	public String getValue(String name) {
	if (arguments == null)
	return null;
	Object value = arguments.get(name);
	String stringValue = null;
	if (value instanceof String)
	stringValue = (String) value;
	else if (value instanceof Vector) {
	@SuppressWarnings("unchecked")
	Vector<String> vector = (Vector<String>) value;
	stringValue = vector.firstElement();
	} else
	return null;
	try {
	return URLCoder.decode(stringValue);
	} catch (Exception e) {
	return null;
	}

	}

	/**
	* Returns the locale specified by client.
	*/
	protected String getLocale() {
	if (locale == null) {
	locale = getValue(PARAM_LANG);
	if (locale == null) {
	locale = Platform.getNL();
	}
	}
	return locale;
	}

	protected String getFile() {
	if (file == null) {
	// Strip the plugin id
	int start = pluginAndFile.indexOf("/") + 1; //$NON-NLS-1$
	// Strip query string or anchor bookmark
	int end = pluginAndFile.indexOf("?"); //$NON-NLS-1$
	if (end == -1)
	end = pluginAndFile.indexOf("#"); //$NON-NLS-1$
	if (end == -1)
	end = pluginAndFile.length();
	file = pluginAndFile.substring(start, end);
	file = URLCoder.decode(file);
	}
	return file;
	}

	protected Bundle getPlugin() {
	if (plugin == null) {
	// Assume the url is pluginID/path_to_topic.html
	int i = pluginAndFile.indexOf('/');
	String pluginId = i == -1 ? "" : pluginAndFile.substring(0, i); //$NON-NLS-1$
	pluginId = URLCoder.decode(pluginId);
	if (PRODUCT_PLUGIN.equals(pluginId)) {
	IProduct product = Platform.getProduct();
	if (product != null) {
	plugin = product.getDefiningBundle();
	return plugin;
	}
	}
	plugin = Platform.getBundle(pluginId);
	}
	return plugin;
	}

	private String getHref() {
	return '/' + pluginAndFile;
	}

	public boolean isCacheable() {
	if (getValue("resultof") != null) //$NON-NLS-1$
	return false;
	return cachingEnabled;
	}

	public String toString() {
	return pluginAndFile;
	}

	/**
	* Obtains ID of plugin that contributes appserver implementation. *
	*
	* @return plug-in ID or null
	*/
	private static String getAppserverImplPluginId() {
	if (appserverImplPluginId == null) {

	// This part mimics AppserverPlugin.createWebappServer()

	// get the app server extension from the system plugin registry
	IExtensionRegistry pluginRegistry = Platform.getExtensionRegistry();
	IExtensionPoint point = pluginRegistry.getExtensionPoint("org.eclipse.help.appserver.server"); //$NON-NLS-1$
	if (point != null) {
	IExtension[] extensions = point.getExtensions();
	if (extensions.length != 0) {
	// We need to pick up the non-default configuration
	IConfigurationElement[] elements = extensions[0].getConfigurationElements();
	if (elements.length == 0)
	return null;
	IConfigurationElement serverElement = null;
	for (int i = 0; i < elements.length; i++) {
	String defaultValue = elements[i].getAttribute("default"); //$NON-NLS-1$
	if (defaultValue == null \|\| defaultValue.equals("false")) { //$NON-NLS-1$
	serverElement = elements[i];
	break;
	}
	}
	// if all the servers are default, then pick the first one
	if (serverElement == null) {
	serverElement = elements[0];
	}
	//

	appserverImplPluginId = serverElement.getContributor().getName();

	}
	}
	}
	return appserverImplPluginId;
	}

	/*
	* Opens a connection to the document on the remote help server, if one was specified. If the
	* document doesn't exist on the remote server, returns null.
	*/
	private InputStream openFromRemoteServer(String href, String locale) {
	if (RemoteHelp.isEnabled()) {

	String pathSuffix = PATH_RTOPIC + href + '?' + PARAM_LANG + '=' + locale;

	/*
	* Get the URL that maps to the contributorID Assume the url is
	* pluginID/path_to_topic.html
	*/
	int i = pluginAndFile.indexOf('/');
	String pluginId = i == -1 ? "" : pluginAndFile.substring(0, i); //$NON-NLS-1$
	pluginId = URLCoder.decode(pluginId);

	String remoteURL = RemoteContentLocator.getUrlForContent(pluginId);

	InputStream in;
	if (remoteURL == null) {
	in = tryOpeningAllServers(pathSuffix);
	} else {
	in = openRemoteStream(remoteURL, pathSuffix);
	}

	return in;
	}
	return null;
	}

	private InputStream getUnverifiedStream(String remoteURL,String pathSuffix)
	{
	URL url;
	InputStream in = null;
	try {

	if(remoteURL.startsWith(PROTOCOL_HTTP))
	{
	url = new URL(remoteURL + pathSuffix);
	HttpURLConnection connection = (HttpURLConnection) ProxyUtil.getConnection(url);
	in = connection.getInputStream();
	}
	else
	{
	url = HttpsUtility.getHttpsURL(remoteURL + pathSuffix);
	in = HttpsUtility.getHttpsStream(url);
	}

	} catch (Exception e) {
	// File not found on this server
	}
	return in;
	}


	private InputStream openRemoteStream(String remoteURL, String pathSuffix) {
	InputStream in = getUnverifiedStream(remoteURL,pathSuffix);

	String errPage[] = templates.get(remoteURL);
	if (errPage==null)
	{
	String error = getPageText(getUnverifiedStream(remoteURL,"/rtopic/fakeurltogetatestpage/_ACEGIKMOQ246.html")); //$NON-NLS-1$
	if (error!=null)
	{
	errPage = error.split("\n"); //$NON-NLS-1$
	templates.put(remoteURL,errPage);
	}
	else
	{
	errPage = new String[0];
	templates.put(remoteURL,errPage);
	}
	}


	// No error page, InfoCenter is at least 3.6, so it is
	// returning null already.
	if (errPage.length==0)
	return in;

	// Check to see if the URL is the error page for the
	// remote IC. If so, return null.
	if (compare(errPage,getUnverifiedStream(remoteURL,pathSuffix)))
	{
	try{
	in.close();
	}catch(Exception ex){}
	return null;
	}
	return in;
	}

	private boolean compare(String lines[],InputStream in)
	{
	try{
	if (in!=null)
	{
	BufferedReader br = new BufferedReader(new InputStreamReader(in));
	String line;
	int count = 0;

	while ((line = br.readLine())!=null)
	{
	if (count>lines.length)
	return false;

	if (!lines[count].equals(line))
	return false;
	count++;
	}
	br.close();
	in.close();
	return true;
	}
	}catch(Exception ex)
	{}
	return false;
	}

	private String getPageText(InputStream in) {
	try{
	if (in!=null)
	{
	BufferedReader br = new BufferedReader(new InputStreamReader(in));
	String line,result=""; //$NON-NLS-1$

	while ((line = br.readLine())!=null)
	{
	result+=line+'\n';
	}
	br.close();
	in.close();
	return result;
	}
	}catch(Exception ex){}

	return null;
	}

	private InputStream tryOpeningAllServers(String pathSuffix) {
	PreferenceFileHandler prefHandler = new PreferenceFileHandler();
	String host[] = prefHandler.getHostEntries();
	String port[] = prefHandler.getPortEntries();
	String protocol[] = prefHandler.getProtocolEntries();
	String path[] = prefHandler.getPathEntries();
	String isEnabled[] = prefHandler.isEnabled();

	int numICs = host.length;

	for (int i = 0; i < numICs; i++) {
	if (isEnabled[i].equalsIgnoreCase("true")) { //$NON-NLS-1$
	String urlStr = protocol[i]+"://" + host[i] + ':' + port[i] + path[i]; //$NON-NLS-1$
	InputStream is = openRemoteStream(urlStr, pathSuffix);
	if (is != null) {
	return is;
	}
	}
	}
	return null;
	}

	}