Re: get portlet instance's fragment id

[David Sean Taylor]

On Jul 30, 2008, at 10:26 PM, xiaodingxiang wrote:

How can I get a portlet instance’s fragment-id in the session, If  
fragment-id is the instance’s only mark..


(1) one approach:

ContentFragment contentFragment = (ContentFragment)  
portletRequest 
.getAttribute(PortalReservedParameters.FRAGMENT_ATTRIBUTE);
contentFragment.getId();

(2) another approach that does not use fragments:

Compile against:
portlet-bridges-common >= 1.0.2 (available at runtime from shared/lib  
classloader)

but do not put this jar in your portlet app's WEB-INF/lib directory

import  org.apache.portals.bridges.util.PortletWindowUtils

String id =   PortletWindoUtils.getPortletWindowId(session);

Note: this method uses a JSR-168 compliant "trick", JSR-286 (Portlet  
API 2.0) will provide a formal API method for it.

Here is the source in case you are interested to see how it works:

package org.apache.portals.bridges.util;

import java.util.Enumeration;

import javax.portlet.PortletSession;
import javax.portlet.PortletSessionUtil;

/**
 * PortletWindowUtils
 *
 * @author <a href="mailto:[EMAIL PROTECTED]">Ate Douma</a>
 * @version $Id: PortletWindowUtils.java 517068 2007-03-12 01:44:37Z  
ate $
 */
public class PortletWindowUtils
{
    public static String PORTLET_WINDOW_ID =  
"org.apache.portals.bridges.util.portlet_window_id";

    /**
     * Return the unique identification for the portlet window as  
assigned by the portal/portlet-container.
     * <br/>
     * This method makes use of the PortletSession to determine the  
window id as specified by the Portlet Specification 1.0, PLT.15.3,
     * as well as stores the determined value under the [EMAIL PROTECTED]  
#PORTLET_WINDOW_ID} in the portlet scope session.
     *
     * @param session the current PortletSession
     * @return the unique identification of the portlet window
     */
    public static String getPortletWindowId(PortletSession session)
    {
        String portletWindowId =  
(String)session.getAttribute(PORTLET_WINDOW_ID);
        if ( portletWindowId == null )
        {
            synchronized (session)
            {
                Double value = new Double(Math.random());
                session.setAttribute(PORTLET_WINDOW_ID, value);
                Enumeration names =  
session.getAttributeNames(PortletSession.APPLICATION_SCOPE);
                while (names.hasMoreElements())
                {
                    String name = (String)names.nextElement();
                    if  
(PortletSessionUtil 
.decodeAttributeName(name).equals(PORTLET_WINDOW_ID) &&  
value 
.equals(session.getAttribute(name,PortletSession.APPLICATION_SCOPE)) )
                    {
                        portletWindowId =  
name.substring("javax.portlet.p.".length(),name.indexOf('?'));
                        session.setAttribute(PORTLET_WINDOW_ID,  
portletWindowId);
                        break;
                    }
                }
            }
        }
        return portletWindowId;
    }

    /**
     * Returns the name an attribute is (or will be) encoded in the  
PortletSession APPLICATION_SCOPE.
     * @param session PortletSession
     * @param attributeName the attribute name to encode
     */
    public static String  
getApplicationScopeSessionAttributeName(PortletSession session, String  
attributeName)
    {
        return  
getApplicationScopeSessionAttributeName 
(getPortletWindowId(session),attributeName);
    }

    /**
     * Returns the name an attribute is (or will be) encoded in the  
PortletSession APPLICATION_SCOPE.
     *
     * @param portletWindowId the unique portlet window  
identification retrieved from [EMAIL PROTECTED]  
#getPortletWindowId(PortletSession)}.
     * @param attributeName the attribute name to encode
     */
    public static String  
getApplicationScopeSessionAttributeName(String portletWindowId, String  
attributeName)
    {
        return "javax.portlet.p."+portletWindowId+"?"+attributeName;
    }
}


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