/*************************************************************************************
 * Copyright (c) 2004 Actuate 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:
 *     Actuate Corporation - Initial implementation.
 ************************************************************************************/

package org.eclipse.birt.report.viewer.utilities;

import java.awt.Toolkit;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLEncoder;
import java.text.Collator;
import java.util.LinkedHashMap;
import java.util.Locale;
import java.util.Map;
import java.util.Random;
import java.util.TreeMap;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.eclipse.birt.report.model.api.util.StringUtil;
import org.eclipse.birt.report.utility.ParameterAccessor;
import org.eclipse.birt.report.viewer.ViewerPlugin;
import org.eclipse.birt.report.viewer.browsers.BrowserAccessor;
import org.eclipse.birt.report.viewer.browsers.BrowserManager;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;

/**
 * Static accessor to display an arbitary url. It serves as an entry point to
 * integrate viewer.
 * <p>
 */
public class WebViewer
{

	private static final String UTF_8 = "utf-8"; //$NON-NLS-1$
	/**
	 * HTML format name
	 */
	public final static String HTML = "html"; //$NON-NLS-1$
	public final static String HTM = "htm"; //$NON-NLS-1$

	/**
	 * PDF format name
	 */
	public final static String PDF = "pdf"; //$NON-NLS-1$

	/**
	 * DOC format name
	 */
	public final static String DOC = "doc"; //$NON-NLS-1$

	/**
	 * POSTSCRIPT format name
	 */
	public final static String POSTSCRIPT = "postscript"; //$NON-NLS-1$

	/**
	 * Report extension
	 */
	public static final String REPORT_DOCUMENT_FILE = ".rptdocument"; //$NON-NLS-1$

	/**
	 * Birt web viewer plugin id
	 */
	public final static String WebAppPlugin = ViewerPlugin.PLUGIN_ID;

	/**
	 * Locale preference name
	 */
	public final static String USER_LOCALE = "user_locale"; //$NON-NLS-1$

	/**
	 * Time zone preference name
	 */
	public final static String USER_TIME_ZONE = "user_time_zone"; //$NON-NLS-1$

	/**
	 * Preference key for SVG chart flag.
	 */
	public final static String SVG_FLAG = "svg_flag"; //$NON-NLS-1$

	public final static String BIDI_ORIENTATION = "bidi_orientation"; //$NON-NLS-1$
	public final static String BIDI_ORIENTATION_AUTO = "auto"; //$NON-NLS-1$
	public final static String BIDI_ORIENTATION_LTR = "ltr"; //$NON-NLS-1$
	public final static String BIDI_ORIENTATION_RTL = "rtl"; //$NON-NLS-1$

	/**
	 * Preference key for master page content flag.
	 */
	public final static String MASTER_PAGE_CONTENT = "master_page_content"; //$NON-NLS-1$

	/** Preference key for max rows. */
	public final static String PREVIEW_MAXROW = "preview_maxrow"; //$NON-NLS-1$

	/** Preference key for max cube fetch levels. */
	public final static String PREVIEW_MAXCUBEROWLEVEL = "preview_maxrowlevelmember"; //$NON-NLS-1$

	public final static String PREVIEW_MAXCUBECOLUMNLEVEL = "preview_maxcolumnlevelmember"; //$NON-NLS-1$

	/** Preference key for max in-memory cube size. */
	public final static String PREVIEW_MAXINMEMORYCUBESIZE = "preview_maxinmemorycubesize"; //$NON-NLS-1$

	// preview model.
	public static final String VIEWER_PREVIEW = "preview"; //$NON-NLS-1$

	// frameset model.
	public static final String VIEWER_FRAMESET = "frameset"; //$NON-NLS-1$

	// running model.
	public static final String VIEWER_RUN = "run"; //$NON-NLS-1$

	// document model
	public static final String VIEWER_DOCUMENT = "document"; //$NON-NLS-1$

	// parameter name constants for the URL

	/**
	 * Key to indicate the format of the preview.
	 */
	public final static String FORMAT_KEY = "FORMAT_KEY"; //$NON-NLS-1$

	/**
	 * Key to indicate the emitter used for preview.
	 */
	public final static String EMITTER_ID_KEY = "EMITTER_ID_KEY"; //$NON-NLS-1$

	/**
	 * Key to indicate the emitter specific options used for preview. The value
	 * must be an instance of Map<String, String>.
	 */
	public final static String EMITTER_OPTIONS_KEY = "EMITTER_OPTIONS_KEY"; //$NON-NLS-1$

	/**
	 * Key to indicate the 'allowPage' control of the preview.
	 */
	public final static String ALLOW_PAGE_KEY = "ALLOW_PAGE_KEY"; //$NON-NLS-1$

	/**
	 * Key to indicate the output document file path.
	 */
	public final static String OUTPUT_DOCUMENT_KEY = "OUTPUT_DOCUMENT_KEY"; //$NON-NLS-1$

	/**
	 * Key to indicate the 'servletName' of the preview.
	 */
	public final static String SERVLET_NAME_KEY = "SERVLET_NAME_KEY"; //$NON-NLS-1$

	/**
	 * Key to indicate the 'documentName' of the preview.
	 */
	public final static String DOCUMENT_NAME_KEY = "DOCUMENT_NAME_KEY"; //$NON-NLS-1$

	/**
	 * Key to indicate the 'resourceFolder'.
	 */
	public final static String RESOURCE_FOLDER_KEY = "RESOURCE_FOLDER_KEY"; //$NON-NLS-1$

	/**
	 * Key to indicate whether close window after complete
	 */
	public final static String CLOSE_WINDOW_KEY = "CLOSE_WINDOW_KEY"; //$NON-NLS-1$

	/**
	 * Key to indicate which appcontext extension is loaded
	 */
	public final static String APPCONTEXT_EXTENSION_KEY = "APPCONTEXT_EXTENSION_KEY"; //$NON-NLS-1$

	/**
	 * Key to indicate the 'maxRows'
	 */
	public final static String MAX_ROWS_KEY = "MAX_ROWS_KEY"; //$NON-NLS-1$

	/**
	 * Key to indicate the 'maxLevelMember'
	 */
	public final static String MAX_CUBE_ROW_LEVELS_KEY = "MAX_CUBE_ROW_LEVELS_KEY"; //$NON-NLS-1$

	public final static String MAX_CUBE_COLUMN_LEVELS_KEY = "MAX_CUBE_COLUMN_LEVELS_KEY"; //$NON-NLS-1$

	/**
	 * Property to indicate whether it is a report debug mode
	 */
	public final static String REPORT_DEBUT_MODE = "report_debug_mode"; //$NON-NLS-1$

	/**
	 * ClassLoader to reload workspace class
	 */
	private static ReloadableClassLoader reloadableClassLoader = null;

	/**
	 * Locale mapping. Key as Locale display name, value is in format like
	 * "en_US"
	 */
	public static TreeMap<String, String> LocaleTable = null;

	static
	{
		// Initialize the locale mapping table
		LocaleTable = new TreeMap<String, String>( Collator.getInstance( ) );
		Locale[] locales = Locale.getAvailableLocales( );
		if ( locales != null )
		{
			for ( int i = 0; i < locales.length; i++ )
			{
				Locale locale = locales[i];
				if ( locale != null )
				{
					if ( locale.getCountry( ).length( ) == 0 )
					{
						LocaleTable.put( locale.getDisplayName( ),
								locale.getLanguage( ) ); //$NON-NLS-1$
					}
					else
					{
						LocaleTable.put( locale.getDisplayName( ),
								locale.getLanguage( )
										+ "_" + locale.getCountry( ) ); //$NON-NLS-1$	
					}

				}
			}
		}
	}

	private static Map<String, IWebAppInfo> apps = new LinkedHashMap<String, IWebAppInfo>( );

	static
	{
		apps.put( ViewerPlugin.WEBAPP_CONTEXT, new IWebAppInfo( ) {

			public String getID( )
			{
				return ViewerPlugin.PLUGIN_ID;
			}

			public String getName( )
			{
				return ViewerPlugin.WEBAPP_CONTEXT;
			}

			public boolean useCustomParamHandling( )
			{
				return false;
			}

		} );
	}

	private static IWebAppInfo DEFAULT_WEBAPP = apps.get( ViewerPlugin.WEBAPP_CONTEXT );

	private static boolean adapterChecked = false;

	private static void checkAdapter( )
	{
		if ( adapterChecked )
		{
			return;
		}

		Object webInfo = Platform.getAdapterManager( )
				.loadAdapter( ViewerPlugin.getDefault( ),
						IWebAppInfo.class.getName( ) );

		if ( webInfo instanceof IWebAppInfo )
		{
			apps.put( ( (IWebAppInfo) webInfo ).getName( ),
					(IWebAppInfo) webInfo );

			DEFAULT_WEBAPP = (IWebAppInfo) webInfo;
		}

		adapterChecked = true;
	}

	public static IWebAppInfo getCurrentWebApp( )
	{
		checkAdapter( );

		return DEFAULT_WEBAPP;
	}

	/**
	 * Get web viewer base url.
	 * 
	 * @return base web viewer application url
	 */
	private static String getBaseURL( String webappName )
	{
		checkAdapter( );

		IWebAppInfo app = apps.get( webappName );

		if ( app == null )
		{
			app = DEFAULT_WEBAPP;
		}

		return "http://" + WebappAccessor.getHost( ) + ":" //$NON-NLS-1$ //$NON-NLS-2$
				+ WebappAccessor.getPort( app.getName( ) )
				+ "/" + app.getName( ) + "/"; //$NON-NLS-1$ //$NON-NLS-2$
	}

	/**
	 * Create web viewer url to run the report.
	 * 
	 * @param report
	 *            report file name
	 * @param params
	 *            report parameter map
	 * @return valid web viewer url
	 */

	private static String createURL( String webappName, String report,
			Map params )
	{
		if ( params == null || params.isEmpty( ) )
			return createURL( webappName,
					null,
					report,
					null,
					null,
					null,
					null,
					null );

		String servletName = (String) params.get( SERVLET_NAME_KEY );
		String format = (String) params.get( FORMAT_KEY );
		String emitterid = (String) params.get( EMITTER_ID_KEY );
		String resourceFolder = (String) params.get( RESOURCE_FOLDER_KEY );
		Boolean allowPage = (Boolean) params.get( ALLOW_PAGE_KEY );
		Map<String, String> emitterOptions = (Map<String, String>) params.get( EMITTER_OPTIONS_KEY );
		String outputDocName = (String) params.get( OUTPUT_DOCUMENT_KEY );

		// maintain legacy support
		if ( HTM.equalsIgnoreCase( format ) )
		{
			format = HTML;
		}

		if ( StringUtil.isBlank( format ) )
		{
			format = StringUtil.isBlank( emitterid ) ? HTML : null;
		}

		if ( !HTML.equalsIgnoreCase( format ) )
		{
			servletName = VIEWER_PREVIEW;
		}
		else
		{
			if ( StringUtil.isBlank( servletName ) )
			{
				if ( allowPage == null )
				{
					servletName = VIEWER_FRAMESET;
				}
				else
				{
					servletName = allowPage.booleanValue( ) ? VIEWER_FRAMESET
							: VIEWER_PREVIEW;
				}
			}
		}

		// max rows setting
		String maxrows = (String) params.get( MAX_ROWS_KEY );

		// max level member setting
		String maxrowlevels = (String) params.get( MAX_CUBE_ROW_LEVELS_KEY );
		String maxcolumnlevels = (String) params.get( MAX_CUBE_COLUMN_LEVELS_KEY );

		// process common parameters
		Map<String, String> urlParams = prepareCommonURLParams( format,
				resourceFolder,
				maxrows,
				maxrowlevels,
				maxcolumnlevels );

		// if document mode, append document parameter in URL
		String documentName = (String) params.get( DOCUMENT_NAME_KEY );
		if ( documentName != null && VIEWER_DOCUMENT.equals( servletName ) )
		{
			// current opened report isn't document
			if ( !isReportDocument( report ) )
			{
				try
				{
					String encodedDocumentName = URLEncoder.encode( documentName,
							UTF_8 );
					urlParams.put( ParameterAccessor.PARAM_REPORT_DOCUMENT,
							encodedDocumentName );

					String isCloseWin = (String) params.get( CLOSE_WINDOW_KEY );
					if ( isCloseWin != null )
					{
						urlParams.put( ParameterAccessor.PARAM_CLOSEWIN,
								isCloseWin );
					}
				}
				catch ( UnsupportedEncodingException e )
				{
					LogUtil.logWarning( e.getLocalizedMessage( ), e );
				}
			}
		}

		// append appcontext extension name
		String appContextName = ViewerPlugin.getDefault( )
				.getPluginPreferences( )
				.getString( APPCONTEXT_EXTENSION_KEY );

		if ( !StringUtil.isBlank( appContextName ) )
		{
			try
			{
				String encodedAppContextName = URLEncoder.encode( appContextName.trim( ),
						UTF_8 );
				urlParams.put( ParameterAccessor.PARAM_APPCONTEXTNAME,
						encodedAppContextName );
			}
			catch ( UnsupportedEncodingException e )
			{
				LogUtil.logWarning( e.getLocalizedMessage( ), e );
			}
		}

		if ( !StringUtil.isBlank( emitterid ) )
		{
			urlParams.put( ParameterAccessor.PARAM_EMITTER_ID, emitterid.trim( ) );
		}

		if ( !StringUtil.isBlank( outputDocName ) )
		{
			try
			{
				String encodedOutputDocumentName = URLEncoder.encode( outputDocName,
						UTF_8 );
				urlParams.put( ParameterAccessor.PARAM_OUTPUT_DOCUMENT_NAME,
						encodedOutputDocumentName );
			}
			catch ( UnsupportedEncodingException e )
			{
				LogUtil.logWarning( e.getLocalizedMessage( ), e );
			}
		}

		if ( emitterOptions != null )
		{
			urlParams.putAll( emitterOptions );
		}

		return createURL( webappName, servletName, report, urlParams );
	}

	/**
	 * Create web viewer url to run the report.
	 * 
	 * @param servletName
	 *            servlet name to viewer report
	 * @param report
	 *            report file name
	 * @param format
	 *            report format
	 * @param resourceFolder
	 *            the resource folder
	 * @param maxrows
	 *            max rows limited
	 * @param maxlevels
	 *            max level member limited
	 * @return valid web viewer url
	 */
	private static String createURL( String webappName, String servletName,
			String report, String format, String resourceFolder,
			String maxrows, String maxrowlevels, String maxcolumnlevels )
	{
		return createURL( webappName,
				servletName,
				report,
				prepareCommonURLParams( format,
						resourceFolder,
						maxrows,
						maxrowlevels,
						maxcolumnlevels ) );
	}

	private static String createURL( String webappName, String servletName,
			String report, Map<String, String> urlParams )
	{
		String encodedReportName = null;

		try
		{
			encodedReportName = URLEncoder.encode( report, UTF_8 );
		}
		catch ( UnsupportedEncodingException e )
		{
			LogUtil.logWarning( e.getLocalizedMessage( ), e );
		}

		String reportParam = ParameterAccessor.PARAM_REPORT;
		if ( isReportDocument( encodedReportName ) )
		{
			reportParam = ParameterAccessor.PARAM_REPORT_DOCUMENT;
		}
		reportParam += "=" + encodedReportName; //$NON-NLS-1$

		// So far, only report name is encoded as utf-8 format
		return getBaseURL( webappName ) + servletName + "?" //$NON-NLS-1$
				+ reportParam
				+ convertParams( urlParams );
	}

	private static String convertParams( Map<String, String> params )
	{
		if ( params != null && !params.isEmpty( ) )
		{
			StringBuffer sb = new StringBuffer( );

			for ( Entry<String, String> entry : params.entrySet( ) )
			{
				sb.append( "&" ).append( entry.getKey( ) ); //$NON-NLS-1$

				if ( entry.getValue( ) != null )
				{
					sb.append( "=" ).append( entry.getValue( ) ); //$NON-NLS-1$
				}
			}

			return sb.toString( );
		}

		return ""; //$NON-NLS-1$
	}

	private static Map<String, String> prepareCommonURLParams( String format,
			String resourceFolder, String maxrows, String maxrowlevels,
			String maxcolumnlevels )
	{
		String timeZone = ViewerPlugin.getDefault( )
				.getPluginPreferences( )
				.getString( USER_TIME_ZONE );
		if ( timeZone != null && "".equals( timeZone ) )
		{
			timeZone = null;
		}

		String locale = ViewerPlugin.getDefault( )
				.getPluginPreferences( )
				.getString( USER_LOCALE );

		if ( LocaleTable.containsKey( locale ) )
		{
			locale = LocaleTable.get( locale );
		}
		else
		{
			if ( "".equals( locale ) ) //$NON-NLS-1$
			{
				locale = null;
			}
			else
			{
				try
				{
					locale = URLEncoder.encode( locale, UTF_8 );
				}
				catch ( UnsupportedEncodingException e )
				{
					locale = null;
					LogUtil.logWarning( e.getLocalizedMessage( ), e );
				}
			}
		}

		String svgFlag = ViewerPlugin.getDefault( )
				.getPluginPreferences( )
				.getString( SVG_FLAG );
		boolean bSVGFlag = false;

		// cube memory size
		String cubeMemorySize = ViewerPlugin.getDefault( )
				.getPluginPreferences( )
				.getString( PREVIEW_MAXINMEMORYCUBESIZE );

		// read rtl value from the preferences
		boolean rtl = false;
		String bidiOrientation = ViewerPlugin.getDefault( )
				.getPluginPreferences( )
				.getString( BIDI_ORIENTATION );
		if ( bidiOrientation == null )
		{
			bidiOrientation = BIDI_ORIENTATION_AUTO;
		}
		if ( BIDI_ORIENTATION_LTR.equals( bidiOrientation ) )
		{
			rtl = false;
		}
		else if ( BIDI_ORIENTATION_RTL.equals( bidiOrientation ) )
		{
			rtl = true;
		}
		else
		{
			// detect rtl from eclipse
			rtl = ( Window.getDefaultOrientation( ) == SWT.RIGHT_TO_LEFT );
		}

		if ( "true".equalsIgnoreCase( svgFlag ) ) //$NON-NLS-1$
		{
			bSVGFlag = true;
		}

		String masterPageContent = ViewerPlugin.getDefault( )
				.getPluginPreferences( )
				.getString( MASTER_PAGE_CONTENT );
		boolean bMasterPageContent = true;
		if ( "false".equalsIgnoreCase( masterPageContent ) ) //$NON-NLS-1$
		{
			bMasterPageContent = false;
		}

		// handle resource folder encoding
		String encodedResourceFolder = null;

		if ( resourceFolder != null )
		{
			try
			{
				encodedResourceFolder = URLEncoder.encode( resourceFolder,
						UTF_8 );
			}
			catch ( UnsupportedEncodingException e )
			{
				LogUtil.logWarning( e.getLocalizedMessage( ), e );
			}
		}

		if ( encodedResourceFolder == null )
		{
			encodedResourceFolder = ""; //$NON-NLS-1$
		}

		// workaround for postscript format, force "Content-Disposition" as
		// "attachment"
		String asattachment = null;
		if ( POSTSCRIPT.equalsIgnoreCase( format ) )
		{
			asattachment = "&__asattachment=true"; //$NON-NLS-1$
		}

		// get the local DPI setting
		int dpi = Toolkit.getDefaultToolkit( ).getScreenResolution( );

		LinkedHashMap<String, String> params = new LinkedHashMap<String, String>( );

		if ( format != null )
		{
			params.put( ParameterAccessor.PARAM_FORMAT, format );
		}
		params.put( ParameterAccessor.PARAM_SVG, String.valueOf( bSVGFlag ) );
		if ( locale != null )
		{
			params.put( ParameterAccessor.PARAM_LOCALE, locale );
		}
		if ( timeZone != null )
		{
			params.put( ParameterAccessor.PARAM_TIMEZONE, timeZone );
		}
		params.put( ParameterAccessor.PARAM_MASTERPAGE,
				String.valueOf( bMasterPageContent ) );
		params.put( ParameterAccessor.PARAM_RTL, String.valueOf( rtl ) );
		if ( !StringUtil.isBlank( maxrows ) )
		{
			params.put( ParameterAccessor.PARAM_MAXROWS, maxrows.trim( ) );
		}
		if ( !StringUtil.isBlank( maxrowlevels ) )
		{
			params.put( ParameterAccessor.PARAM_MAXCUBE_ROWLEVELS,
					maxrowlevels.trim( ) );
		}
		if ( !StringUtil.isBlank( maxcolumnlevels ) )
		{
			params.put( ParameterAccessor.PARAM_MAXCUBE_COLUMNLEVELS,
					maxcolumnlevels.trim( ) );
		}
		if ( !StringUtil.isBlank( cubeMemorySize ) )
		{
			params.put( ParameterAccessor.PARAM_CUBEMEMSIZE,
					cubeMemorySize.trim( ) );
		}
		params.put( ParameterAccessor.PARAM_RESOURCE_FOLDER,
				encodedResourceFolder );
		if ( asattachment != null )
		{
			params.put( ParameterAccessor.PARAM_AS_ATTACHMENT, "true" ); //$NON-NLS-1$
		}
		params.put( ParameterAccessor.PARAM_DPI, String.valueOf( dpi ) );

		return params;
	}

	/**
	 * Start web application.
	 */
	private synchronized static void startWebApp( String webappName )
	{
		checkAdapter( );

		try
		{
			// if don't load debug ui, viewer will handle to set workspace
			// classpath
			String debugMode = System.getProperty( REPORT_DEBUT_MODE );
			if ( debugMode == null )
			{
				// get workspace classpath
				String classpaths = ViewerClassPathHelper.getWorkspaceClassPath( );

				URL[] urls = ViewerClassPathHelper.parseURLs( classpaths );
				if ( reloadableClassLoader == null )
				{
					// create ReloadableClassLoader
					reloadableClassLoader = new ReloadableClassLoader( urls,
							WebViewer.class.getClassLoader( ) );
				}
				else
				{
					// reload class
					reloadableClassLoader.setUrls( urls );
					reloadableClassLoader.reload( );
				}
			}

			IWebAppInfo app = apps.get( webappName );

			if ( app != null )
			{
				WebappAccessor.start( app.getName( ), app.getID( ) );
			}
		}
		catch ( CoreException e )
		{
			LogUtil.logError( e.getLocalizedMessage( ), e );
		}
	}

	/**
	 * Stop web application
	 */
	private static void stopWebApp( String webappName )
	{
		try
		{
			WebappAccessor.stop( webappName );
		}
		catch ( CoreException e )
		{
			LogUtil.logError( e.getLocalizedMessage( ), e );
		}
	}

	/**
	 * Initiate the tomcat.
	 * 
	 */
	public static void startup( )
	{
		checkAdapter( );

		startup( DEFAULT_WEBAPP.getName( ) );
	}

	public static void startup( String webappName )
	{
		startWebApp( webappName );
	}

	/**
	 * Initiate the tomcat.
	 * 
	 * @param browser
	 *            SWT browser
	 * 
	 * @deprecated use {@link #startup(String)}
	 */
	public static void startup( Browser browser )
	{
		checkAdapter( );

		startup( DEFAULT_WEBAPP.getName( ) );
	}

	/**
	 * Stop the web server
	 */
	public static void stop( )
	{
		stop( DEFAULT_WEBAPP.getName( ) );
	}

	public static void stopAll( )
	{
		try
		{
			WebappAccessor.stopAll( );
		}
		catch ( CoreException e )
		{
			LogUtil.logError( e.getLocalizedMessage( ), e );
		}
	}

	public static void stop( String webappName )
	{
		stopWebApp( webappName );
	}

	/**
	 * Displays the specified url.
	 * 
	 * @param report
	 *            report report
	 * @param format
	 *            report format
	 */
	public static void display( String report, String format )
	{
		checkAdapter( );

		display( DEFAULT_WEBAPP.getName( ), report, format );
	}

	public static void display( String webappName, String report, String format )
	{
		display( webappName, report, format, true );
	}

	/**
	 * Displays the specified url.
	 * 
	 * @param report
	 * @param format
	 * @param allowPage
	 */
	public static void display( String report, String format, boolean allowPage )
	{
		checkAdapter( );

		display( DEFAULT_WEBAPP.getName( ), report, format, allowPage );
	}

	public static void display( String webappName, String report,
			String format, boolean allowPage )
	{
		if ( format == null
				|| format.trim( ).length( ) <= 0
				|| HTM.equalsIgnoreCase( format ) )
			format = HTML;

		String root = null;
		if ( !HTML.equalsIgnoreCase( format ) )
		{
			root = createURL( webappName,
					VIEWER_PREVIEW,
					report,
					format,
					null,
					null,
					null,
					null );
		}
		else
		{
			root = createURL( webappName, allowPage ? VIEWER_FRAMESET
					: VIEWER_PREVIEW, report, format, null, null, null, null )
					+ "&" + new Random( ).nextInt( ); //$NON-NLS-1$
		}

		startWebApp( webappName );

		try
		{
			boolean useExternal = ViewerPlugin.getDefault( )
					.getPluginPreferences( )
					.getBoolean( BrowserManager.ALWAYS_EXTERNAL_BROWSER_KEY );

			BrowserAccessor.getPreviewBrowser( useExternal ).displayURL( root );
		}
		catch ( Exception e )
		{
			LogUtil.logError( e.getLocalizedMessage( ), e );
		}
	}

	/**
	 * Displays the specified url useing eclipse SWT browser.
	 * 
	 * @param report
	 *            report report
	 * @param format
	 *            report format
	 * @param browser
	 *            SWT browser instance
	 * @deprecated
	 */
	public static void display( String report, String format, Browser browser )
	{
		checkAdapter( );

		startWebApp( DEFAULT_WEBAPP.getName( ) );
		browser.setUrl( createURL( DEFAULT_WEBAPP.getName( ),
				"run", report, format, null, null, null, null ) + "&" + new Random( ).nextInt( ) ); //$NON-NLS-1$ //$NON-NLS-2$

	}

	/**
	 * Displays the specified url using eclipse SWT browser.
	 * 
	 * @param report
	 *            report report
	 * @param format
	 *            report format
	 * @param browser
	 *            SWT browser instance
	 * @param servletName
	 *            servlet name to viewer report
	 * @deprecated
	 */
	public static void display( String report, String format, Browser browser,
			String servletName )
	{
		checkAdapter( );

		startWebApp( DEFAULT_WEBAPP.getName( ) );
		browser.setUrl( createURL( DEFAULT_WEBAPP.getName( ),
				servletName,
				report,
				format,
				null,
				null,
				null,
				null )
				+ "&" + new Random( ).nextInt( ) ); //$NON-NLS-1$
	}

	/**
	 * Displays the specified url using eclipse SWT browser.
	 * 
	 * @param report
	 *            report report
	 * @param browser
	 *            SWT browser instance
	 * @param params
	 *            the parameter map to set
	 */

	public static void display( String report, Browser browser, Map params )
	{
		checkAdapter( );

		display( DEFAULT_WEBAPP.getName( ), report, browser, params );
	}

	public static void display( String webappName, String report,
			Browser browser, Map params )
	{
		startWebApp( webappName );
		browser.setUrl( createURL( webappName, report, params )
				+ "&" + new Random( ).nextInt( ) ); //$NON-NLS-1$
	}

	/**
	 * Displays the specified url using eclipse SWT browser.
	 * 
	 * @param report
	 *            report report
	 * @param params
	 *            the parameter map to set
	 */

	public static void display( String report, Map params )
	{
		checkAdapter( );

		display( DEFAULT_WEBAPP.getName( ), report, params );
	}

	public static void display( String webappName, String report, Map params )
	{
		startWebApp( webappName );

		try
		{

			boolean useExternal = ViewerPlugin.getDefault( )
					.getPluginPreferences( )
					.getBoolean( BrowserManager.ALWAYS_EXTERNAL_BROWSER_KEY );

			BrowserAccessor.getPreviewBrowser( useExternal )
					.displayURL( createURL( webappName, report, params )
							+ "&" + new Random( ).nextInt( ) ); //$NON-NLS-1$
		}
		catch ( Exception e )
		{
			LogUtil.logError( e.getLocalizedMessage( ), e );
		}
	}

	/**
	 * Check whether the report is a document file.
	 * 
	 * @param reportName
	 * @return true or false
	 */
	private static boolean isReportDocument( String reportName )
	{
		if ( reportName == null )
			return false;

		Pattern p = Pattern.compile( ".[a-z]{3}document$" ); //$NON-NLS-1$
		Matcher m = p.matcher( reportName );
		if ( m.find( ) )
			return true;

		return false;
	}

	/**
	 * Cancel the process
	 * 
	 * @param browser
	 */
	public static void cancel( Browser browser )
	{
		if ( browser == null || browser.isDisposed( ) )
		{
			return;
		}

		try
		{
			browser.execute( "try { if( birtProgressBar ){ birtProgressBar.cancel(); } } catch(e){}" ); //$NON-NLS-1$
		}
		catch ( Exception e )
		{
			LogUtil.logError( e.getLocalizedMessage( ), e );
		}
	}

	/**
	 * @return Returns user specified app context name, if it's null, a default
	 *         one will be used.
	 */
	public static String getAppContextName( )
	{
		String appContextName = ViewerPlugin.getDefault( )
				.getPluginPreferences( )
				.getString( APPCONTEXT_EXTENSION_KEY );

		if ( appContextName != null && appContextName.trim( ).length( ) > 0 )
		{
			return appContextName.trim( );
		}

		return null;
	}

	/**
	 * Returns the application classloader
	 * 
	 * @return
	 */
	public static ClassLoader getAppClassLoader( )
	{
		return reloadableClassLoader;
	}
}