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.IAsset;
019    import org.apache.tapestry.IMarkupWriter;
020    import org.apache.tapestry.IRequestCycle;
021    
022    /**
023     * The Image component indicates that an image is to be included in the text
024     * flow. Image layout is done within the context of normal text layout.
025     * 
026     * @author David Solis
027     * @since 3.0
028     */
029    
030    public abstract class Image extends AbstractComponent
031    {
032    
033        /**
034         * @see org.apache.tapestry.AbstractComponent#renderComponent(org.apache.tapestry.IMarkupWriter,
035         *      org.apache.tapestry.IRequestCycle)
036         */
037    
038        protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
039        {
040            boolean render = !cycle.isRewinding();
041    
042            if (render)
043            {
044                writer.beginEmpty("img");
045    
046                writer.attribute("src", getImage().buildURL());
047    
048                writer.attribute("alt", getAlt());
049    
050                renderInformalParameters(writer, cycle);
051    
052                writer.closeTag();
053            }
054        }
055    
056        public abstract IAsset getImage();
057    
058        public abstract String getAlt();
059    }