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1   /*
2    * $Id: DefinitionRenderer.java 1215008 2011-12-16 00:31:49Z 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.renderer;
22  
23  import java.io.IOException;
24  
25  import org.apache.tiles.TilesContainer;
26  import org.apache.tiles.request.Request;
27  import org.apache.tiles.request.render.CannotRenderException;
28  import org.apache.tiles.request.render.Renderer;
29  
30  /**
31   * Renders an attribute that contains a reference to a definition.
32   *
33   * @version $Rev: 1215008 $ $Date: 2011-12-16 11:31:49 +1100 (Fri, 16 Dec 2011) $
34   * @since 3.0.0
35   */
36  public class DefinitionRenderer implements Renderer {
37  
38      /**
39       * The Tiles container.
40       */
41      private TilesContainer container;
42  
43      /**
44       * Constructor.
45       *
46       * @param container The Tiles container.
47       */
48      public DefinitionRenderer(TilesContainer container) {
49          this.container = container;
50      }
51  
52      /** {@inheritDoc} */
53      @Override
54      public void render(String path, Request request) throws IOException {
55          if (path == null) {
56              throw new CannotRenderException("Cannot dispatch a null path");
57          }
58  
59          container.render(path, request);
60      }
61  
62      /** {@inheritDoc} */
63      public boolean isRenderable(String path, Request request) {
64          return path != null && container.isValidDefinition(path, request);
65      }
66  }