Collect


1   package org.incava.util;
2   
3   import java.util.*;
4   
5   
6   /**
7    * Collects a collections into a collection.
8    */
9   public abstract class Collect extends ArrayList
10  {
11      /**
12       * Creates a new collection, where the condition passes the condition.
13       *
14       * @param c The collection from which to build the new collection.
15       */
16      public Collect(Collection c) 
17      {
18          Iterator it = c.iterator();
19          while (it.hasNext()) {
20              Object   obj = it.next();
21              if (where(obj)) {
22                  add(block(obj));
23              }
24          }
25      }
26  
27      /**
28       * Ditto, but for real arrays.
29       */
30      public Collect(Object  [] ary) 
31      {
32          for (int i = 0; i < ary.length; ++i) {
33              Object   obj = ary[i];
34              if (where(obj)) {
35                  add(block(obj));
36              }
37          }
38      }
39  
40      /**
41       * Must be defined to return where the given object satisfies the condition.
42       *
43       * @param obj An object from the collection passed to the constructor.
44       */
45      public abstract boolean where(Object   obj);
46      
47      /**
48       * Returns the object to add to the collection.
49       *
50       * @param obj An object from the collection passed to the constructor.
51       */
52      public Object   block(Object   obj) 
53      {
54          return obj;
55      }
56  }
57
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