001    /*
002     * Copyright 2006 Stephen J. McConnell.
003     *
004     * Licensed  under the  Apache License,  Version 2.0  (the "License");
005     * you may not use  this file  except in  compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     *   http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed  under the  License is distributed on an "AS IS" BASIS,
012     * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
013     * implied.
014     *
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    
019    package net.dpml.lang;
020    
021    import dpml.util.ElementHelper;
022    
023    import java.io.IOException;
024    
025    import net.dpml.util.Resolver;
026    
027    import org.w3c.dom.Element;
028    
029    /**
030     * Antlib strategy handler implementation.
031     *
032     * @author <a href="http://www.dpml.net">Digital Product Management Laboratory</a>
033     * @version 2.0.2
034     */
035    public class AntlibStrategyHandler implements StrategyHandler
036    {
037       /**
038        * Antlib strategy namespace constant.
039        */
040        public static final String NAMESPACE = "dpml:antlib";
041        
042       /**
043        * Creation of a new antlib strategy.
044        * @param c the target class
045        * @return the strategy instance
046        * @exception IOException if an IO error occurs
047        */
048        public Strategy newStrategy( Class<?> c ) throws IOException
049        {
050            return newStrategy( c, null );
051        }
052        
053       /**
054        * Creation of a new antlib strategy.
055        * @param c the target class
056        * @param name the name to assign to the strategy
057        * @return the strategy instance
058        * @exception IOException if an IO error occurs
059        */
060        public Strategy newStrategy( Class<?> c, String name ) throws IOException
061        {
062            throw new UnsupportedOperationException( "newStrategy" );
063        }
064        
065       /**
066        * Construct a strategy definition using a supplied element and value resolver.
067        * @param classloader the classloader
068        * @param element the DOM element definining the deployment strategy
069        * @param resolver symbolic property resolver
070        * @param partition the enclosing partition
071        * @param query the query fragment (ignored)
072        * @param validate the validation policy
073        * @return the strategy definition
074        * @exception IOException if an I/O error occurs
075        */
076        public Strategy build( 
077          ClassLoader classloader, Element element, Resolver resolver, String partition, 
078          String query, boolean validate ) throws IOException
079        {
080            String urn = ElementHelper.getAttribute( element, "urn", null, resolver );
081            String path = ElementHelper.getAttribute( element, "path", null, resolver );
082            return new AntlibStrategy( classloader, urn, path );
083        }
084    }