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1   /*
2    * $Id: StrutsVelocityContext.java 471756 2006-11-06 15:01:43Z husted $
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.struts2.views.velocity;
22  
23  import org.apache.velocity.VelocityContext;
24  
25  import com.opensymphony.xwork2.util.ValueStack;
26  
27  
28  /***
29   */
30  public class StrutsVelocityContext extends VelocityContext {
31  
32      private static final long serialVersionUID = 8497212428904436963L;
33      ValueStack stack;
34      VelocityContext[] chainedContexts;
35  
36  
37      public StrutsVelocityContext(ValueStack stack) {
38          this(null, stack);
39      }
40  
41      public StrutsVelocityContext(VelocityContext[] chainedContexts, ValueStack stack) {
42          this.chainedContexts = chainedContexts;
43          this.stack = stack;
44      }
45  
46  
47      public boolean internalContainsKey(Object key) {
48          boolean contains = super.internalContainsKey(key);
49  
50          // first let's check to see if we contain the requested key
51          if (contains) {
52              return true;
53          }
54  
55          // if not, let's search for the key in the ognl value stack
56          if (stack != null) {
57              Object o = stack.findValue(key.toString());
58  
59              if (o != null) {
60                  return true;
61              }
62  
63              o = stack.getContext().get(key.toString());
64              if (o != null) {
65                  return true;
66              }
67          }
68  
69          // if we still haven't found it, le's search through our chained contexts
70          if (chainedContexts != null) {
71              for (int index = 0; index < chainedContexts.length; index++) {
72                  if (chainedContexts[index].containsKey(key)) {
73                      return true;
74                  }
75              }
76          }
77  
78          // nope, i guess it's really not here
79          return false;
80      }
81  
82      public Object internalGet(String key) {
83          // first, let's check to see if have the requested value
84          if (super.internalContainsKey(key)) {
85              return super.internalGet(key);
86          }
87  
88          // still no luck?  let's look against the value stack
89          if (stack != null) {
90              Object object = stack.findValue(key);
91  
92              if (object != null) {
93                  return object;
94              }
95  
96              object = stack.getContext().get(key);
97              if (object != null) {
98                  return object;
99              }
100 
101         }
102 
103         // finally, if we're chained to other contexts, let's look in them
104         if (chainedContexts != null) {
105             for (int index = 0; index < chainedContexts.length; index++) {
106                 if (chainedContexts[index].containsKey(key)) {
107                     return chainedContexts[index].internalGet(key);
108                 }
109             }
110         }
111 
112         // nope, i guess it's really not here
113         return null;
114     }
115 }