OgnlValueStackShadowMap


1   /*
2    * Copyright (c) 2002-2003 by OpenSymphony
3    * All rights reserved.
4    */
5   package com.opensymphony.webwork.views.jasperreports;
6   
7   import com.opensymphony.xwork.util.OgnlValueStack;
8   
9   import java.util.HashMap  ;
10  import java.util.Set  ;
11  
12  
13  /**
14   * Ported to WebWork2:
15   *
16   * @author &lt;a HREF="hermanns@aixcept.de"&gt;Rainer Hermanns&lt;/a&gt;
17   * @version $Id: OgnlValueStackShadowMap.java,v 1.3 2004/06/18 19:30:00 plightbo Exp $
18   */
19  public class OgnlValueStackShadowMap extends HashMap   {
20      //~ Instance fields ////////////////////////////////////////////////////////
21  
22      /**
23       * valueStack reference
24       */
25      OgnlValueStack valueStack;
26  
27      /**
28       * entries reference
29       */
30      Set   entries;
31  
32      //~ Constructors ///////////////////////////////////////////////////////////
33  
34      /**
35       * Constructs an instance of OgnlValueStackShadowMap.
36       *
37       * @param valueStack - the underlying valuestack
38       */
39      public OgnlValueStackShadowMap(OgnlValueStack valueStack) {
40          this.valueStack = valueStack;
41      }
42  
43      //~ Methods ////////////////////////////////////////////////////////////////
44  
45      /**
46       * Implementation of containsKey(), overriding HashMap implementation.
47       *
48       * @param key - The key to check in HashMap and if not found to check on valueStack.
49       * @return <tt>true</tt>, if conatins key, <tt>false</tt> otherwise.
50       * @see java.util.HashMap#containsKey
51       */
52      public boolean containsKey(Object   key) {
53          boolean hasKey = super.containsKey(key);
54  
55          if (!hasKey) {
56              if (valueStack.findValue((String  ) key) != null) {
57                  hasKey = true;
58              }
59          }
60  
61          return hasKey;
62      }
63  
64      /**
65       * Implementation of get(), overriding HashMap implementation.
66       *
67       * @param key - The key to get in HashMap and if not found there from the valueStack.
68       * @return value - The object from HashMap or if null, from the valueStack.
69       * @see java.util.HashMap#get
70       */
71      public Object   get(Object   key) {
72          Object   value = super.get(key);
73  
74          if ((value == null) && key instanceof String  ) {
75              value = valueStack.findValue((String  ) key);
76          }
77  
78          return value;
79      }
80  }
81
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