PageLink


1   // Copyright 2004, 2005 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.tapestry.link;
16  
17  import org.apache.tapestry.INamespace;
18  import org.apache.tapestry.IRequestCycle;
19  import org.apache.tapestry.engine.IEngineService;
20  import org.apache.tapestry.engine.ILink;
21  
22  /**
23   * A component for creating a navigation link to another page, using the page service. [ <a
24   * HREF="../../../../../ComponentReference/PageLink.html">Component Reference </a>]
25   * 
26   * @author Howard Ship
27   */
28  
29  public abstract class PageLink extends AbstractLinkComponent
30  {
31      public abstract IEngineService getPageService();
32  
33      public ILink getLink(IRequestCycle cycle)
34      {
35          String   parameter = null;
36          INamespace namespace = getTargetNamespace();
37          String   targetPage = getTargetPage();
38  
39          if (namespace == null)
40              parameter = targetPage;
41          else
42              parameter = namespace.constructQualifiedName(targetPage);
43  
44          return getPageService().getLink(cycle, parameter);
45      }
46  
47      public abstract String   getTargetPage();
48  
49      /** @since 2.2 * */
50  
51      public abstract INamespace getTargetNamespace();
52  }
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