TableModelExtAdapter


1   /*
2    * $Id: TableModelExtAdapter.java,v 1.1 2005/01/27 14:40:25 kleopatra Exp $
3    *
4    * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
5    * Santa Clara, California 95054, U.S.A. All rights reserved.
6    */
7   
8   package org.jdesktop.swing.data;
9   
10  import javax.swing.event.TableModelEvent  ;
11  import javax.swing.event.TableModelListener  ;
12  
13  /**
14   * Adapts a DefaultTableModelExt object to the DataModel interface so that
15   * user-interface components other than a table can easily be bound to
16   * columns in the model.
17   *
18   * @author Amy Fowler
19   * @version 1.0
20   */
21  public class TableModelExtAdapter extends AbstractDataModel {
22  
23      private DefaultTableModelExt model;
24      private int rowIndex = -1;
25      private boolean updatingModel = false;
26  
27      public TableModelExtAdapter(DefaultTableModelExt model) {
28          this.model = model;
29          model.addTableModelListener(new TableModelListener  () {
30              public void tableChanged(TableModelEvent   e) {
31                  if (updatingModel) {
32                      return;
33                  }
34                  if (e.getType() == TableModelEvent.UPDATE) {
35                      if (rowIndex >= e.getFirstRow() && rowIndex <= e.getLastRow()) {
36                          int columnIndex = e.getColumn();
37                          final DefaultTableModelExt model = TableModelExtAdapter.this.model;
38  // cvs version (1.3) does only fire for one column
39                          fireColumnsChanged(model, columnIndex, columnIndex);
40                      }
41                  }
42              }
43              private void fireColumnsChanged(DefaultTableModelExt model, int firstColumn, int lastColumn) {
44                if (firstColumn < 0) {
45                  firstColumn = 0;
46                  lastColumn = model.getColumnCount()-1;
47                }
48                for (int col = firstColumn; col <= lastColumn; col++) {
49                  fireValueChanged(model.getColumnMetaData(col).getName());
50                }
51                
52              }
53          });
54      }
55  
56      public String  [] getFieldNames() {
57          int columnCount = model.getColumnCount();
58          String   columnNames[] = new String  [columnCount];
59          MetaData metaData[] = model.getMetaData();
60          for(int i = 0; i < columnCount; i++) {
61              columnNames[i] = metaData[i].getName();
62          }
63          return columnNames;
64      }
65  
66      public MetaData getMetaData(String   fieldName) {
67          return model.getColumnMetaData(model.getColumnIndex(fieldName));
68      }
69  
70      public int getFieldCount() {
71          return model.getColumnCount();
72      }
73  
74      public Object   getValue(String   fieldName) {
75          return getRecordIndex() >= 0 ? 
76              model.getValueAt(getRecordIndex(), model.getColumnIndex(fieldName)) : null;
77      }
78  
79      protected void setValueImpl(String   fieldName, Object   value) {
80          if (getRecordIndex() < 0) return;
81           updatingModel = true;
82           model.setValueAt(value, getRecordIndex(), model.getColumnIndex(fieldName));
83           updatingModel = false;
84       }
85  
86      /**
87       * Sets the current record index such that the data field values
88       * in this value map represent the values contained at the specified
89       * row in the tabular data model.
90       * @param rowIndex integer representing the current row index
91       * @throws IndexOutOfBoundsException if index >= recordCount
92       */
93      public void setRecordIndex(int rowIndex) {
94          if (rowIndex >= model.getRowCount()) {
95              throw new IndexOutOfBoundsException  ("row index " + rowIndex +
96                                                  "exceeds row count " +
97                                                  model.getRowCount());
98          }
99          if (this.rowIndex != rowIndex) {
100             this.rowIndex = rowIndex;
101             String   fieldNames[] = getFieldNames();
102             for(int i = 0; i < fieldNames.length; i++) {
103                 fireValueChanged(fieldNames[i]);
104             }
105         }
106     }
107 
108     /**
109      *
110      * @return integer representing the current row index
111      */
112     public int getRecordIndex() {
113         return rowIndex;
114     }
115 
116     /**
117      *
118      * @return integer representing the number of rows currently in
119      *         the tabular data model
120      */
121     public int getRecordCount() {
122         return model.getRowCount();
123     }
124 }
125
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