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1   /*
2    * $Id: BasicRendererFactory.java 1306435 2012-03-28 15:39:11Z nlebas $
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   * http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  package org.apache.tiles.request.render;
22  
23  import java.util.HashMap;
24  import java.util.Map;
25  
26  
27  /**
28   * Basic renderer factory implementation.
29   *
30   * @version $Rev: 1306435 $ $Date: 2012-03-29 02:39:11 +1100 (Thu, 29 Mar 2012) $
31   */
32  public class BasicRendererFactory implements RendererFactory {
33  
34      /**
35       * The renderer name/renderer map.
36       */
37      protected Map<String, Renderer> renderers;
38  
39      /**
40       * The default renderer.
41       */
42      protected Renderer defaultRenderer;
43  
44      /**
45       * Constructor.
46       */
47      public BasicRendererFactory() {
48          renderers = new HashMap<String, Renderer>();
49      }
50  
51      /** {@inheritDoc} */
52      public Renderer getRenderer(String name) {
53          Renderer retValue;
54          if (name != null) {
55              retValue = renderers.get(name);
56              if (retValue == null) {
57                  throw new NoSuchRendererException("Cannot find a renderer named '" + name + "'");
58              }
59          } else {
60              retValue = defaultRenderer;
61          }
62  
63          return retValue;
64      }
65  
66      /**
67       * Sets the default renderer.
68       *
69       * @param renderer The default renderer.
70       */
71      public void setDefaultRenderer(Renderer renderer) {
72          this.defaultRenderer = renderer;
73      }
74  
75      /**
76       * Registers a renderer.
77       *
78       * @param name The name of the renderer.
79       * @param renderer The renderer to register.
80       */
81      public void registerRenderer(String name, Renderer renderer) {
82          renderers.put(name, renderer);
83      }
84  }