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ScopeVariableResolverFactory xref
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1   /*
2    * $Id: ScopeVariableResolverFactory.java 1049688 2010-12-15 20:15:41Z apetrelli $
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  
22  package org.apache.tiles.mvel;
23  
24  import java.util.Map;
25  
26  import org.apache.tiles.context.TilesRequestContextHolder;
27  import org.apache.tiles.request.Request;
28  import org.mvel2.integration.VariableResolver;
29  
30  /**
31   * Resolves beans stored in request, session and application scopes.
32   *
33   * @version $Rev: 1049688 $ $Date: 2010-12-16 07:15:41 +1100 (Thu, 16 Dec 2010) $
34   * @since 2.2.0
35   */
36  public class ScopeVariableResolverFactory extends
37          ReadOnlyVariableResolverFactory {
38  
39      /**
40       * The length of the scope suffix: "Scope".
41       */
42      private static final int SCOPE_SUFFIX_LENGTH = 5;
43  
44      /**
45       * Constructor.
46       *
47       * @param requestHolder The Tiles request holder.
48       * @since 2.2.0
49       */
50      public ScopeVariableResolverFactory(TilesRequestContextHolder requestHolder) {
51          super(requestHolder);
52      }
53  
54      /** {@inheritDoc} */
55      @Override
56      public VariableResolver createVariableResolver(String name) {
57          return new ScopeVariableResolver(name);
58      }
59  
60      /** {@inheritDoc} */
61      public boolean isTarget(String name) {
62          Request request = requestHolder.getTilesRequestContext();
63          if (name.endsWith("Scope")) {
64              String scopeName = name.substring(0, name.length() - SCOPE_SUFFIX_LENGTH);
65              for (String availableScope : request.getAvailableScopes()) {
66                  if (scopeName.equals(availableScope)) {
67                      return true;
68                  }
69              }
70          }
71          return false;
72      }
73  
74      /**
75       * Resolves a single attribute stored in request, session or application scope.
76       *
77       * @version $Rev: 1049688 $ $Date: 2010-12-16 07:15:41 +1100 (Thu, 16 Dec 2010) $
78       * @since 2.2.0
79       */
80      private class ScopeVariableResolver extends ReadOnlyVariableResolver {
81  
82          /**
83           * Constructor.
84           *
85           * @param name The name of the attribute.
86           * @since 2.2.0
87           */
88          public ScopeVariableResolver(String name) {
89              super(name);
90          }
91  
92          /** {@inheritDoc} */
93          @SuppressWarnings("rawtypes")
94          public Class getType() {
95              return Map.class;
96          }
97  
98          /** {@inheritDoc} */
99          public Object getValue() {
100             Request request = requestHolder.getTilesRequestContext();
101             return request.getContext(name.substring(0, name.length() - SCOPE_SUFFIX_LENGTH));
102         }
103     }
104 }