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Java > Open Source Codes > org > apache > tapestry > link > ExternalLink


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.IRequestCycle;
18 import org.apache.tapestry.engine.ExternalServiceParameter;
19 import org.apache.tapestry.engine.IEngineService;
20 import org.apache.tapestry.engine.ILink;
21
22 /**
23  * A component for creating a link to {@link org.apache.tapestry.IExternalPage}using the
24  * {@link org.apache.tapestry.engine.ExternalService}. [ <a
25  * HREF="../../../../../ComponentReference/ExternalLink.html">Component Reference </a>]
26  *
27  * @see org.apache.tapestry.IExternalPage
28  * @see org.apache.tapestry.engine.ExternalService
29  * @author Malcolm Edgar
30  */
31
32 public abstract class ExternalLink extends AbstractLinkComponent
33 {
34     public abstract IEngineService getExternalService();
35
36     public ILink getLink(IRequestCycle cycle)
37     {
38         Object JavaDoc[] serviceParameters = DirectLink.constructServiceParameters(getParameters());
39
40         ExternalServiceParameter esp = new ExternalServiceParameter(getTargetPage(),
41                 serviceParameters);
42
43         return getExternalService().getLink(cycle, esp);
44     }
45
46     public abstract Object JavaDoc getParameters();
47
48     public abstract String JavaDoc getTargetPage();
49 }
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