OSMF SVN

/*****************************************************
*  
*  Copyright 2009 Adobe Systems Incorporated.  All Rights Reserved.
*  
*****************************************************
*  The contents of this file are subject to the Mozilla Public License
*  Version 1.1 (the "License"); you may not use this file except in
*  compliance with the License. You may obtain a copy of the License at
*  http://www.mozilla.org/MPL/
*   
*  Software distributed under the License is distributed on an "AS IS"
*  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
*  License for the specific language governing rights and limitations
*  under the License.
*   
*  
*  The Initial Developer of the Original Code is Adobe Systems Incorporated.
*  Portions created by Adobe Systems Incorporated are Copyright (C) 2009 Adobe Systems 
*  Incorporated. All Rights Reserved. 
*  
*****************************************************/
package
{
	import org.osmf.media.IMediaResource;
	import org.osmf.media.IMediaResourceHandler;
	import org.osmf.metadata.KeyValueFacet;
	import org.osmf.net.NetLoader;
	import org.osmf.utils.URL;
	
	/**
	 * Resource handler that returns true if the resource is a) a video and
	 * b) has a specific piece of metadata.
	 **/
	public class MetadataResourceHandler implements IMediaResourceHandler
	{
		public function canHandleResource(resource:IMediaResource):Boolean
		{
			var canHandle:Boolean = false;
			
			// Use a NetLoader to make sure we can handle the resource.
			var netLoader:NetLoader = new NetLoader();
			if (netLoader.canHandleResource(resource))
			{
				// Now check for the metadata.  We only want to handle the
				// resource if it has a specific piece of metadata.
				var kvFacet:KeyValueFacet = resource.metadata.getFacet(CUSTOM_NS) as KeyValueFacet;
				if (kvFacet != null)
				{
					// We could check that a specific key on the facet exists,
					// and that that key has a specific value.  But to keep
					// it simple, we return true based solely on the facet's
					// existence.
					canHandle = true; 
				}
			}
			
			return canHandle;
		}
		
		private static const CUSTOM_NS:URL = new URL("http://example.com/myCustomNS");
	}
}