001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.link;
016    
017    import org.apache.tapestry.INamespace;
018    import org.apache.tapestry.IRequestCycle;
019    import org.apache.tapestry.engine.IEngineService;
020    import org.apache.tapestry.engine.ILink;
021    
022    /**
023     * A component for creating a navigation link to another page, using the page service. [ <a
024     * href="../../../../../ComponentReference/PageLink.html">Component Reference </a>]
025     * 
026     * @author Howard Ship
027     */
028    
029    public abstract class PageLink extends AbstractLinkComponent
030    {
031        public abstract IEngineService getPageService();
032    
033        public ILink getLink(IRequestCycle cycle)
034        {
035            String parameter = null;
036            INamespace namespace = getTargetNamespace();
037            String targetPage = getTargetPage();
038    
039            if (namespace == null)
040                parameter = targetPage;
041            else
042                parameter = namespace.constructQualifiedName(targetPage);
043    
044            return getPageService().getLink(false, parameter);
045        }
046    
047        public abstract String getTargetPage();
048    
049        /** @since 2.2 * */
050    
051        public abstract INamespace getTargetNamespace();
052    }