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1   /*
2    * $Id: BasicPreparerFactory.java 1310865 2012-04-07 21:01:22Z 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.preparer.factory;
22  
23  import java.util.HashMap;
24  import java.util.Map;
25  
26  import org.apache.tiles.preparer.ViewPreparer;
27  import org.apache.tiles.request.Request;
28  import org.apache.tiles.request.reflect.ClassUtil;
29  import org.slf4j.Logger;
30  import org.slf4j.LoggerFactory;
31  
32  /**
33   * Default implementation of the {@link PreparerFactory}.
34   * This factory provides no contextual configuration.  It
35   * simply instantiates the named preparerInstance and returns it.
36   *
37   * @since Tiles 2.0
38   * @version $Rev: 1310865 $ $Date: 2012-04-08 07:01:22 +1000 (Sun, 08 Apr 2012) $
39   */
40  public class BasicPreparerFactory implements PreparerFactory {
41  
42      /**
43       * The logging object.
44       */
45      private final Logger log = LoggerFactory
46              .getLogger(BasicPreparerFactory.class);
47  
48      /**
49       * Maps a preparer name to the instantiated preparer.
50       */
51      protected Map<String, ViewPreparer> preparers;
52  
53      /**
54       * Constructor.
55       */
56      public BasicPreparerFactory() {
57          this.preparers = new HashMap<String, ViewPreparer>();
58      }
59  
60  
61      /**
62       * Create a new instance of the named preparerInstance.  This factory
63       * expects all names to be qualified class names.
64       *
65       * @param name    the named preparerInstance
66       * @param context current context
67       * @return ViewPreparer instance
68       */
69      public ViewPreparer getPreparer(String name, Request context) {
70  
71          if (!preparers.containsKey(name)) {
72              preparers.put(name, createPreparer(name));
73          }
74  
75          return preparers.get(name);
76      }
77  
78      /**
79       * Creates a view preparer for the given name.
80       *
81       * @param name The name of the preparer.
82       * @return The created preparer.
83       */
84      protected ViewPreparer createPreparer(String name) {
85  
86          log.debug("Creating ViewPreparer '{}' . . .", name);
87  
88          Object instance = ClassUtil.instantiate(name, true);
89          log.debug("ViewPreparer created successfully");
90          return (ViewPreparer) instance;
91  
92      }
93  }