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1   /*
2    * Copyright 2007-2008 the original author or authors.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.gwe.drivers;
18  
19  import java.util.EnumMap;
20  import java.util.Map;
21  
22  import org.apache.commons.logging.Log;
23  import org.apache.commons.logging.LogFactory;
24  import org.gwe.utils.security.ProtocolScheme;
25  import org.gwe.utils.security.ResourceLink;
26  
27  /**
28   * @author Marco Ruiz
29   * @since Dec 6, 2008
30   */
31  public class ResourceHandleFactory extends EnumMap<ProtocolScheme, Class> {
32  
33  	private static Log log = LogFactory.getLog(ResourceHandleFactory.class);
34  
35  	public ResourceHandleFactory(Map<ProtocolScheme, Class> values) {
36  		this();
37  		this.putAll(values);
38      }
39  
40  	public ResourceHandleFactory() {
41  	    super(ProtocolScheme.class);
42      }
43  	
44  	public <HANDLE_TYPE extends ResourceHandle> HANDLE_TYPE createHandle(ResourceLink<HANDLE_TYPE> link) throws HandleCreationException {
45  		try {
46  			return (HANDLE_TYPE) getHandleClass(link).getConstructor(ResourceLink.class).newInstance(link);
47  	    } catch (Exception e) {
48  	    	String msg = "Problems creating handle for resource '" + link.getURI() + "' using reflection";
49  	    	log.warn(msg, e);
50  			throw new HandleCreationException(msg, e);
51  	    }
52  	}
53  
54  	public <HANDLE_TYPE extends ResourceHandle> Class<HANDLE_TYPE> getHandleClass(ResourceLink<HANDLE_TYPE> link) {
55  		return get(link.getURI().getProtocolScheme());
56  	}
57  }