ContainUtil


1   /*
2    * Copyright (c) 2002-2003 by OpenSymphony
3    * All rights reserved.
4    */
5   package com.opensymphony.webwork.util;
6   
7   import java.lang.reflect.Array  ;
8   import java.util.Collection  ;
9   import java.util.Map  ;
10  
11  
12  /**
13   * <code>ContainUtil</code> will check if object 1 contains object 2.
14   * Object 1 may be an Object, array, Collection, or a Map
15   *
16   * @author Matt Baldree (matt@smallleap.com)
17   * @version $Revision: 1.3 $
18   */
19  public class ContainUtil {
20      //~ Methods ////////////////////////////////////////////////////////////////
21  
22      public static boolean contains(Object   obj1, Object   obj2) {
23          if ((obj1 == null) || (obj2 == null)) {
24              //log.debug("obj1 or obj2 are null.");
25              return false;
26          }
27  
28          if (obj1 instanceof Map  ) {
29              if (((Map  ) obj1).containsValue(obj2)) {
30                  //log.debug("obj1 is a map and contains obj2");
31                  return true;
32              }
33          } else if (obj1 instanceof Collection  ) {
34              if (((Collection  ) obj1).contains(obj2)) {
35                  //log.debug("obj1 is a collection and contains obj2");
36                  return true;
37              }
38          } else if (obj1.getClass().isArray()) {
39              for (int i = 0; i < Array.getLength(obj1); i++) {
40                  Object   value = null;
41                  value = Array.get(obj1, i);
42  
43                  if (value.equals(obj2)) {
44                      //log.debug("obj1 is an array and contains obj2");
45                      return true;
46                  }
47              }
48          } else if (obj1.equals(obj2)) {
49              //log.debug("obj1 is an object and equals obj2");
50              return true;
51          }
52  
53          //log.debug("obj1 does not contain obj2: " + obj1 + ", " + obj2);
54          return false;
55      }
56  }
57
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