NamespacingViewRoot


1   package com.icesoft.faces.component;
2   
3   import com.icesoft.jasper.Constants;
4   import java.io.Serializable  ;
5   
6   import javax.faces.component.UIViewRoot;
7   import javax.faces.context.ExternalContext;
8   import javax.faces.context.FacesContext;
9   import java.util.Map  ;
10  
11  /**
12   * The Sun RI does not call encodeNamespace when it creates unique ID's whereas
13   * MyFaces does.  In order to support portlets, component ids must have the
14   * appropriate namespace applied.  This custom UIViewRoot class can be used by
15   * our own custom ViewHandler.  It simply overrides the createUniqueId method
16   * and, if necessary, prepends the namespace to each component id.
17   */
18  public class NamespacingViewRoot extends UIViewRoot  implements Serializable  {
19  
20      private ExternalContext extCtxt;
21      private String   namespace;
22  
23      public NamespacingViewRoot(FacesContext context) {
24          extCtxt = context.getExternalContext();
25          Map   requestMap = extCtxt.getRequestMap();
26          namespace = (String  )requestMap.get(Constants.NAMESPACE_KEY);
27      }
28  
29      /**
30       * Overrides the UIViewRoot.createUniqueId method. The parent method is
31       * called and the resulting id has the namespace pre-pended if:
32       * - a namespace has been made available (e.g. portlets)
33       * - the namespace has not already been prepended (e.g. MyFaces)
34       * 
35       * @return a unique component id, potentially with a namespace prepended
36       */
37      public String   createUniqueId() {
38          String   uniqueID = super.createUniqueId();
39  
40          if (namespace == null || uniqueID.startsWith(namespace)) {
41              return uniqueID;
42          }
43  
44          return extCtxt.encodeNamespace(uniqueID);
45      }
46  }
47
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