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.wml;
016    
017    import org.apache.tapestry.AbstractComponent;
018    import org.apache.tapestry.IMarkupWriter;
019    import org.apache.tapestry.IRequestCycle;
020    
021    /**
022     *  The onevent element binds a task to a particular intrinsic event for the immediately enclosing element, ie,
023     *  specifying an onevent element inside an "XYZ" element associates an intrinsic event binding with the "XYZ" element.
024     *  The user agent must ignore any onevent element specifying a type that does not correspond to a legal intrinsic event
025     *  for the immediately enclosing element.
026     *
027     *  @author David Solis
028     *  @since 3.0
029     *
030     **/
031    
032    public abstract class OnEvent extends AbstractComponent
033    {
034        /**
035         *  @see AbstractComponent#renderComponent(IMarkupWriter, IRequestCycle)
036         **/
037    
038        protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
039        {
040            boolean render = !cycle.isRewinding();
041    
042            if (render)
043            {
044                writer.begin("onevent");
045    
046                writer.attribute("type", getType());
047    
048                renderInformalParameters(writer, cycle);
049            }
050    
051            renderBody(writer, cycle);
052    
053            if (render)
054            {
055                writer.end();
056            }
057        }
058    
059        public abstract String getType();
060    
061    }