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.html;
016
017import org.apache.tapestry.AbstractComponent;
018import org.apache.tapestry.IMarkupWriter;
019import org.apache.tapestry.IRequestCycle;
020import org.apache.tapestry.engine.IEngineService;
021import 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
030public 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}