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 }