List2d


1   package org.apache.poi.util;
2   
3   import java.util.List  ;
4   import java.util.ArrayList  ;
5   
6   /**
7    * Provides an interface for interacting with 2d arrays of objects.  This
8    * implementation will return null for items not yet allocated and automatically
9    * increase the array size for set operations.  You never get an index out of
10   * bounds.
11   *
12   * @author Glen Stampoultzis (glens at apache.org)
13   * @version $Id: List2d.java,v 1.1 2004/04/18 13:02:48 glens Exp $
14   */
15  public class List2d
16  {
17      // Implemented using a List of List's.
18      List   rows = new ArrayList  ();
19  
20      public Object   get(int col, int row)
21      {
22          if (row >= rows.size())
23          {
24              return null;
25          }
26          else
27          {
28              List   cols = (List  ) rows.get(row);
29              if (col >= cols.size())
30                  return null;
31              else
32                  return cols.get( col );
33          }
34      }
35  
36      public void set(int col, int row, Object   value)
37      {
38          resizeRows(row);
39          resizeCols(row,col);
40          List   cols = (List  ) rows.get( row );
41          cols.set( col, value );
42      }
43  
44      private void resizeRows( int row )
45      {
46          while (rows.size() <= row)
47              rows.add( new ArrayList  () );
48      }
49  
50      private void resizeCols( int row, int col )
51      {
52          List   cols = (List  ) rows.get( row );
53          while (cols.size() <= col)
54              cols.add(null);
55      }
56  
57  
58  }
59
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