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Ajax4jsf is an open source extension to the JavaServer Faces standard that adds AJAX capability to JSF applications without requiring the writing of any JavaScript.
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/**
 * Licensed under the Common Development and Distribution License,
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.sun.com/cddl/
 *   
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package org.ajax4jsf.tag;

import java.io.OutputStream;

import org.ajax4jsf.ajax.resource.UIMediaOutput;

import com.sun.facelets.FaceletContext;
import com.sun.facelets.el.LegacyMethodBinding;
import com.sun.facelets.tag.MetaRule;
import com.sun.facelets.tag.MetaRuleset;
import com.sun.facelets.tag.Metadata;
import com.sun.facelets.tag.MetadataTarget;
import com.sun.facelets.tag.TagAttribute;
import com.sun.facelets.tag.jsf.ComponentConfig;
import com.sun.facelets.tag.jsf.ComponentHandler;

/**
 * @author shura (latest modification by $Author: alexsmirnov $)
 * @version $Revision: 1.1 $ $Date: 2006/07/19 12:36:10 $
 *
 */
public class MediaOutputHandler extends ComponentHandler {

	private static final MetaRule mmediaMetaRule = new MMediaMetaRule();
	/**
	 * @param config
	 */
	public MediaOutputHandler(ComponentConfig config) {
		super(config);
		
	}

	/* (non-Javadoc)
	 * @see org.ajax4jsf.tag.AjaxComponentHandler#createMetaRuleset(java.lang.Class)
	 */
	protected MetaRuleset createMetaRuleset(Class type) {
		MetaRuleset metaRules = super.createMetaRuleset(type);
		metaRules.addRule(mmediaMetaRule);
		return metaRules;
	}

	/**
	 * @author shura (latest modification by $Author: alexsmirnov $)
	 * @version $Revision: 1.1 $ $Date: 2006/07/19 12:36:10 $
	 *
	 */
	static class MMediaMetaRule extends MetaRule{

		/**
		 * 
		 */
		public MMediaMetaRule() {
			super();
		}

		/* (non-Javadoc)
		 * @see com.sun.facelets.tag.MetaRule#applyRule(java.lang.String, com.sun.facelets.tag.TagAttribute, com.sun.facelets.tag.MetadataTarget)
		 */
		public Metadata applyRule(String name, TagAttribute attribute, MetadataTarget meta) {
	        if (meta.isTargetInstanceOf(UIMediaOutput.class)) {


	            if ("createContent".equals(name)) {
	                    return new MMediaActionMapper(attribute);
	            }
	        }
			return null;
		}

	}
	/**
	 * @author shura (latest modification by $Author: alexsmirnov $)
	 * @version $Revision: 1.1 $ $Date: 2006/07/19 12:36:10 $
	 *
	 */
	static class MMediaActionMapper extends Metadata {

		private static final Class[] MMEDIA_ACTION_SIG = new Class[] {OutputStream.class,Object.class};

		private final TagAttribute _send;
		/**
		 * @param attribute
		 */
		public MMediaActionMapper(TagAttribute attribute) {
			_send = attribute;
		}

		/* (non-Javadoc)
		 * @see com.sun.facelets.tag.Metadata#applyMetadata(com.sun.facelets.FaceletContext, java.lang.Object)
		 */
		public void applyMetadata(FaceletContext ctx, Object instance) {
            ((UIMediaOutput) instance)
            .setCreateContent(new LegacyMethodBinding(this._send
                    .getMethodExpression(ctx, null,
                            MMEDIA_ACTION_SIG)));
		}

	}

}