ColumnNameCache


1   // $Id: ColumnNameCache.java,v 1.6 2005/02/20 23:02:30 oneovthafew Exp $
2   package org.hibernate.jdbc;
3   
4   import java.sql.SQLException  ;
5   import java.util.HashMap  ;
6   import java.util.Map  ;
7   
8   /**
9    * Implementation of ColumnNameCache.
10   *
11   * @author Steve Ebersole
12   */
13  public class ColumnNameCache {
14  
15      private final Map   columnNameToIndexCache;
16  
17      public ColumnNameCache(int columnCount) {
18          // should *not* need to grow beyond the size of the total number of columns in the rs
19          this.columnNameToIndexCache = new HashMap  ( columnCount );
20      }
21  
22      public int getIndexForColumnName(String   columnName, ResultSetWrapper rs)throws SQLException   {
23          Integer   cached = ( Integer   ) columnNameToIndexCache.get( columnName );
24          if ( cached != null ) {
25              return cached.intValue();
26          }
27          else {
28              int index = rs.getTarget().findColumn( columnName );
29              columnNameToIndexCache.put( columnName, new Integer  (index) );
30              return index;
31          }
32      }
33  }
34

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