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.html;
016    
017    import org.apache.tapestry.AbstractComponent;
018    import org.apache.tapestry.IMarkupWriter;
019    import org.apache.tapestry.IRequestCycle;
020    import org.apache.tapestry.engine.IEngineService;
021    import org.apache.tapestry.engine.ILink;
022    
023    /**
024     * Implements a &lt;frame&gt; within a &lt;frameset&gt;. [ <a
025     * href="../../../../../ComponentReference/Frame.html">Component Reference </a>]
026     * 
027     * @author Howard Lewis Ship
028     */
029    
030    public abstract class Frame extends AbstractComponent
031    {
032        /**
033         * Injected engine service.
034         * 
035         * @since 4.0
036         */
037        public abstract IEngineService getPageService();
038    
039        protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
040        {
041            IEngineService pageService = getPageService();
042            ILink link = pageService.getLink(false, getTargetPage());
043    
044            writer.beginEmpty("frame");
045            writer.attribute("src", link.getURL());
046    
047            renderInformalParameters(writer, cycle);
048    
049            writer.closeTag();
050        }
051    
052        public abstract String getTargetPage();
053    
054        public abstract void setTargetPage(String targetPage);
055    }