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
015package org.apache.tapestry.link;
016
017import org.apache.tapestry.INamespace;
018import org.apache.tapestry.IRequestCycle;
019import org.apache.tapestry.engine.IEngineService;
020import 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
029public 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}