Stephane Bailliez wrote: %<------------------------------%<
> > I have been doing this too by I have some problems since I need to pass > quite some parameters to the 'next' or 'cancel' or whatever page. My URL is > giving me the navigation state (ie what module are you browsing, which > business object are you viewing, in which folder and which node and things > like this). > > This leads to heavy java and vm code :( so I think there is a flaw in my > solution and I'd better use the next template as template + params. (sort of > a the url encoded result of a parameter parser). I started naively and know > I feel the pain. I am including my base action class, is your approach similar? The 'doRedirect' method can be used to convert the URL. Have a look at the 'setParameterPair' method. You can specify which parameters should be removed from the URL. It also changes all the 'next' type of parameters to their 'current' equivalents. It *should* put the rest of the pathinfo and querydata parameters back the way it found it. ;). Note that I am not advocating this approach, I am simply including the source to illustrate my question. Hope this helps. - Johnny > > The problem is always 'where' to store the state though... > > Interesting interview: > http://www.theserverside.com/events/index.jsp > Inderjeet Singh, J2EE Blueprints Architect, Sun > > Stephane > > -- > To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> >
/* ****************************************************************************** * * * (c) Copyright 2001 EPI-USE Systems * * * * This program is free software; you can redistribute it and/or modify it * * under the terms of the GNU Lesser General Public License as published by * * the Free Software Foundation; either version 2.1 of the License, or * * (at your option) any later version. * * * * This program 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 Lesser General Public * * License for more details. * * * * You should have received a copy of the GNU Lesser General Public License * * along with this program; if not, write to the Free Software Foundation, * * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * * ****************************************************************************** */ /* * IcosWebAction.java * * Created on August 10, 2001, 2:15 PM */ package org.icosphere.icosweb.core.actions.base; import org.apache.turbine.services.pull.TurbinePull; import org.apache.velocity.context.Context; import org.icosphere.icosweb.core.util.IcosWebConstants; import org.icosphere.icosweb.core.util.IcosWebLink; import org.apache.turbine.services.velocity.TurbineVelocity; import java.util.Enumeration; import java.util.Vector; import java.util.Hashtable; import java.util.StringTokenizer; import java.util.HashMap; import org.apache.turbine.util.RunData; import org.apache.turbine.util.Log; import org.apache.turbine.util.ParameterParser; import org.apache.turbine.util.parser.DefaultParameterParser; import javax.servlet.http.HttpUtils; import org.icosphere.icosweb.core.tools.IcosWebRequestTool; import org.apache.turbine.modules.actions.VelocityAction; /** * Purpose: Base class for all action class implementations for icosWeb. * * <p>Description: Determines the current, next, and cancel templates as well * as the resource access mode and type each time an action is executed. Every * class inheriting from IcosWebAction must call super.doPerform() at the * beginning of each of it's action event methods so that the templates can * be determined. * * <p>Known bugs: * * <p>TODO: * * @author <a href="mailto:[EMAIL PROTECTED]";>Johnny Cass</a> * @version $Id: IcosWebAction.java,v 1.7 2001/12/04 10:22:49 jcass Exp $ */ public abstract class IcosWebAction extends VelocityAction { /** * Tries to determine the current, next, and cancel template and the * the resource access mode and type using the RunData parameters. Each * of the template names default to the currently displayed template if * no corresponding values are found in the RunData parameters. * * The keys to use for finding the different templates are obtained from * IcosWebConstants.java. * * @param data RunData object for this request. * @param context Velocity context for this request. * @throws Exception Thrown by Turbine. */ public void doPerform ( RunData data, Context context ) throws Exception { setNavigationParameters ( data ); } /** * This manages clicking the Cancel button. * * @param data RunData object for this request. * @param context Velocity context for this request. * @throws Exception Thrown by Turbine. */ public void doCancel ( RunData data, Context context ) throws Exception { setNavigationParameters ( data ); data.setScreenTemplate ( this.cancelTemplate ); data.getParameters ().add ( IcosWebConstants.RESOURCE_TYPE, this.cancelResourceType ); data.getParameters ().add ( IcosWebConstants.RESOURCE_ACCESS_MODE, this.resourceAccessMode ); } private void setNavigationParameters ( RunData data ) throws Exception { this.template = data.getParameters () .getString ( IcosWebConstants.TEMPLATE, data.getScreenTemplate () ); this.nextTemplate = data.getParameters () .getString ( IcosWebConstants.NEXT_TEMPLATE, this.template ); this.cancelTemplate = data.getParameters () .getString ( IcosWebConstants.CANCEL_TEMPLATE, this.template ); Log.debug ( "template is '" + this.template + "'" ); Log.debug ( "nextTemplate is '" + this.nextTemplate + "'" ); Log.debug ( "cancelTemplate is '" + this.cancelTemplate + "'" ); this.resourceType = data.getParameters () .getString ( IcosWebConstants.RESOURCE_TYPE, null ); this.nextResourceType = data.getParameters () .getString ( IcosWebConstants.NEXT_RESOURCE_TYPE, this.resourceType ); this.cancelResourceType = data.getParameters () .getString ( IcosWebConstants.CANCEL_RESOURCE_TYPE, this.resourceType ); Log.debug ( "resourceType is '" + this.resourceType + "'" ); Log.debug ( "nextResourceType is '" + this.nextResourceType + "'" ); Log.debug ( "cancelResourceType is '" + this.cancelResourceType + "'" ); this.resourceAccessMode = data.getParameters () .getString ( IcosWebConstants.RESOURCE_ACCESS_MODE, null ); this.nextResourceAccessMode = data.getParameters () .getString ( IcosWebConstants.NEXT_RESOURCE_ACCESS_MODE, this.resourceAccessMode ); this.cancelResourceAccessMode = data.getParameters () .getString ( IcosWebConstants.CANCEL_RESOURCE_ACCESS_MODE, this.resourceAccessMode ); Log.debug ( "resourceAccessMode is '" + this.resourceAccessMode + "'" ); Log.debug ( "nextResourceAccessMode is '" + this.nextResourceAccessMode + "'" ); Log.debug ( "cancelResourceAccessMode is '" + this.cancelResourceAccessMode + "'" ); } /** * Performs a redirect on the response. This method can be used to ensure * that the URL for the request matches the rendered page for the response. This * is a workaround for the whole 'back button' issue. The problem arises from the * fact that the action determines which page to display next after the action * has been executed (using the next- and cancel- parameters) so that the * URL for the request does not neccesarily match the output of the page * (e.g. the 'template' or 'resource type' viewed do not match the parameters * in the URL). <br><br> * * Since we should probably not execute the action again if the user * presses the 'back' button, we need to redirect to a safe URL that * does not contain the action parameter. <br><br> * * @param data The RunData for this request. * @throws Exception Thrown by Turbine. */ protected void doRedirect ( RunData data ) throws Exception { if ( data.getRequest ().getPathInfo () == null ) { return; } IcosWebLink redirectLink = new IcosWebLink (); redirectLink.init ( ( Object ) data ); redirectLink.addPathInfo ( getSafePathInfo ( data ) ); redirectLink.addQueryData ( getSafeQueryData ( data ) ); // Make sure we use the most recent resource. IcosWebRequestTool icosWebR = ( IcosWebRequestTool ) TurbinePull .getTool ( TurbineVelocity.getContext ( data ), IcosWebConstants .ICOSWEB_REQUEST_TOOL ); redirectLink.setResource ( icosWebR.getResource () ); String redirectURL = redirectLink.toString (); Log.debug ( "Redirecting from '" + data.getRequest ().getRequestURI () + "' to '" + redirectURL + "'" ); TurbinePull.releaseTools ( TurbineVelocity.getContext ( data ) ); data.getResponse ().sendRedirect ( redirectURL ); } private ParameterParser getSafePathInfo ( RunData data ) { ParameterParser parameterParser = new DefaultParameterParser (); String pathInfo = data.getRequest ().getPathInfo (); HashMap keys = new HashMap (); if ( pathInfo != null && !pathInfo.equals ( "" ) ) { StringTokenizer stringTokenizer = new StringTokenizer ( pathInfo, "/" ); while ( stringTokenizer.hasMoreTokens () ) { String key = stringTokenizer.nextToken (); if ( !keys.containsKey ( key ) ) { keys.put ( key, new Vector () ); } Vector valuesVector = ( Vector ) keys.get ( key ); valuesVector.add ( stringTokenizer.nextToken () ); String[] valuesArray = new String[valuesVector.size ()]; for ( int i=0; i<valuesArray.length; i++ ) { valuesArray[i] = ( String ) valuesVector.get ( i ); } setParameterPair ( parameterParser, key, valuesArray ); } } return parameterParser; } private ParameterParser getSafeQueryData ( RunData data ) { ParameterParser parameterParser = new DefaultParameterParser (); String queryData = data.getRequest ().getQueryString (); if ( queryData != null && !queryData.equals ( "" ) ) { Hashtable queryDataTable = HttpUtils.parseQueryString ( queryData ); Enumeration keys = queryDataTable.keys (); while ( keys.hasMoreElements () ) { String key = ( String ) keys.nextElement (); setParameterPair ( parameterParser, key, ( String [] ) queryDataTable.get ( key ) ); } } return parameterParser; } private void setParameterPair ( ParameterParser parameterParser, String key, String[] values ) { if ( key.equalsIgnoreCase ( IcosWebConstants.RESOURCE ) || key .equalsIgnoreCase ( "action" ) || key.startsWith ( "cancel" ) || key.equalsIgnoreCase ( "_session_access_counter" ) ) { // Skip these key / value pairs. return; } else if ( key.equalsIgnoreCase ( IcosWebConstants.NEXT_TEMPLATE ) ) { key = IcosWebConstants.TEMPLATE; } else if ( key.equalsIgnoreCase ( IcosWebConstants.NEXT_RESOURCE_TYPE ) ) { key = IcosWebConstants.RESOURCE_TYPE; } else if ( key.equalsIgnoreCase ( IcosWebConstants.NEXT_RESOURCE_ACCESS_MODE ) ) { key = IcosWebConstants.RESOURCE_ACCESS_MODE; } parameterParser.setStrings ( key, values ); } protected String nextTemplate = null; protected String cancelTemplate = null; protected String template = null; protected String nextResourceType = null; protected String cancelResourceType = null; protected String resourceType = null; protected String nextResourceAccessMode = null; protected String cancelResourceAccessMode = null; protected String resourceAccessMode = null; }
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