Java™ Platform
Standard Ed. 6

javax.swing.table
Class DefaultTableModel

java.lang.Object
  extended by javax.swing.table.AbstractTableModel
      extended by javax.swing.table.DefaultTableModel
All Implemented Interfaces:
Serializable, TableModel

public class DefaultTableModel
extends AbstractTableModel
implements Serializable

This is an implementation of TableModel that uses a Vector of Vectors to store the cell value objects.

Warning: DefaultTableModel returns a column class of Object. When DefaultTableModel is used with a TableRowSorter this will result in extensive use of toString, which for non-String data types is expensive. If you use DefaultTableModel with a TableRowSorter you are strongly encouraged to override getColumnClass to return the appropriate type.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeansTM has been added to the java.beans package. Please see XMLEncoder.

See Also:
TableModel, getDataVector()

Field Summary
protected  Vector columnIdentifiers
          The Vector of column identifiers.
protected  Vector dataVector
          The Vector of Vectors of Object values.
 
Fields inherited from class javax.swing.table.AbstractTableModel
listenerList
 
Constructor Summary
DefaultTableModel()
          Constructs a default DefaultTableModel which is a table of zero columns and zero rows.
DefaultTableModel(int rowCount, int columnCount)
          Constructs a DefaultTableModel with rowCount and columnCount of null object values.
DefaultTableModel(Object[][] data, Object[] columnNames)
          Constructs a DefaultTableModel and initializes the table by passing data and columnNames to the setDataVector method.
DefaultTableModel(Object[] columnNames, int rowCount)
          Constructs a DefaultTableModel with as many columns as there are elements in columnNames and rowCount of null object values.
DefaultTableModel(Vector columnNames, int rowCount)
          Constructs a DefaultTableModel with as many columns as there are elements in columnNames and rowCount of null object values.
DefaultTableModel(Vector data, Vector columnNames)
          Constructs a DefaultTableModel and initializes the table by passing data and columnNames to the setDataVector method.
 
Method Summary
 void addColumn(Object columnName)
          Adds a column to the model.
 void addColumn(Object columnName, Object[] columnData)
          Adds a column to the model.
 void addColumn(Object columnName, Vector columnData)
          Adds a column to the model.
 void addRow(Object[] rowData)
          Adds a row to the end of the model.
 void addRow(Vector rowData)
          Adds a row to the end of the model.
protected static Vector convertToVector(Object[] anArray)
          Returns a vector that contains the same objects as the array.
protected static Vector convertToVector(Object[][] anArray)
          Returns a vector of vectors that contains the same objects as the array.
 int getColumnCount()
          Returns the number of columns in this data table.
 String getColumnName(int column)
          Returns the column name.
 Vector getDataVector()
          Returns the Vector of Vectors that contains the table's data values.
 int getRowCount()
          Returns the number of rows in this data table.
 Object getValueAt(int row, int column)
          Returns an attribute value for the cell at row and column.
 void insertRow(int row, Object[] rowData)
          Inserts a row at row in the model.
 void insertRow(int row, Vector rowData)
          Inserts a row at row in the model.
 boolean isCellEditable(int row, int column)
          Returns true regardless of parameter values.
 void moveRow(int start, int end, int to)
          Moves one or more rows from the inclusive range start to end to the to position in the model.
 void newDataAvailable(TableModelEvent event)
          Equivalent to fireTableChanged.
 void newRowsAdded(TableModelEvent e)
          Ensures that the new rows have the correct number of columns.
 void removeRow(int row)
          Removes the row at row from the model.
 void rowsRemoved(TableModelEvent event)
          Equivalent to fireTableChanged.
 void setColumnCount(int columnCount)
          Sets the number of columns in the model.
 void setColumnIdentifiers(Object[] newIdentifiers)
          Replaces the column identifiers in the model.
 void setColumnIdentifiers(Vector columnIdentifiers)
          Replaces the column identifiers in the model.
 void setDataVector(Object[][] dataVector, Object[] columnIdentifiers)
          Replaces the value in the dataVector instance variable with the values in the array dataVector.
 void setDataVector(Vector dataVector, Vector columnIdentifiers)
          Replaces the current dataVector instance variable with the new Vector of rows, dataVector.
 void setNumRows(int rowCount)
          Obsolete as of Java 2 platform v1.3.
 void setRowCount(int rowCount)
          Sets the number of rows in the model.
 void setValueAt(Object aValue, int row, int column)
          Sets the object value for the cell at column and row.
 
Methods inherited from class javax.swing.table.AbstractTableModel
addTableModelListener, findColumn, fireTableCellUpdated, fireTableChanged, fireTableDataChanged, fireTableRowsDeleted, fireTableRowsInserted, fireTableRowsUpdated, fireTableStructureChanged, getColumnClass, getListeners, getTableModelListeners, removeTableModelListener
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

dataVector

protected Vector dataVector
The Vector of Vectors of Object values.


columnIdentifiers

protected Vector columnIdentifiers
The Vector of column identifiers.

Constructor Detail

DefaultTableModel

public DefaultTableModel()
Constructs a default DefaultTableModel which is a table of zero columns and zero rows.


DefaultTableModel

public DefaultTableModel(int rowCount,
                         int columnCount)
Constructs a DefaultTableModel with rowCount and columnCount of null object values.

Parameters:
rowCount - the number of rows the table holds
columnCount - the number of columns the table holds
See Also:
setValueAt(java.lang.Object, int, int)

DefaultTableModel

public DefaultTableModel(Vector columnNames,
                         int rowCount)
Constructs a DefaultTableModel with as many columns as there are elements in columnNames and rowCount of null object values. Each column's name will be taken from the columnNames vector.

Parameters:
columnNames - vector containing the names of the new columns; if this is null then the model has no columns
rowCount - the number of rows the table holds
See Also:
setDataVector(java.util.Vector, java.util.Vector), setValueAt(java.lang.Object, int, int)

DefaultTableModel

public DefaultTableModel(Object[] columnNames,
                         int rowCount)
Constructs a DefaultTableModel with as many columns as there are elements in columnNames and rowCount of null object values. Each column's name will be taken from the columnNames array.

Parameters:
columnNames - array containing the names of the new columns; if this is null then the model has no columns
rowCount - the number of rows the table holds
See Also:
setDataVector(java.util.Vector, java.util.Vector), setValueAt(java.lang.Object, int, int)

DefaultTableModel

public DefaultTableModel(Vector data,
                         Vector columnNames)
Constructs a DefaultTableModel and initializes the table by passing data and columnNames to the setDataVector method.

Parameters:
data - the data of the table, a Vector of Vectors of Object values
columnNames - vector containing the names of the new columns
See Also:
getDataVector(), setDataVector(java.util.Vector, java.util.Vector)

DefaultTableModel

public DefaultTableModel(Object[][] data,
                         Object[] columnNames)
Constructs a DefaultTableModel and initializes the table by passing data and columnNames to the setDataVector method. The first index in the Object[][] array is the row index and the second is the column index.

Parameters:
data - the data of the table
columnNames - the names of the columns
See Also:
getDataVector(), setDataVector(java.util.Vector, java.util.Vector)
Method Detail

getDataVector

public Vector getDataVector()
Returns the Vector of Vectors that contains the table's data values. The vectors contained in the outer vector are each a single row of values. In other words, to get to the cell at row 1, column 5:

((Vector)getDataVector().elementAt(1)).elementAt(5);

Returns:
the vector of vectors containing the tables data values
See Also:
newDataAvailable(javax.swing.event.TableModelEvent), newRowsAdded(javax.swing.event.TableModelEvent), setDataVector(java.util.Vector, java.util.Vector)

setDataVector

public void setDataVector(Vector dataVector,
                          Vector columnIdentifiers)
Replaces the current dataVector instance variable with the new Vector of rows, dataVector. Each row is represented in dataVector as a Vector of Object values. columnIdentifiers are the names of the new columns. The first name in columnIdentifiers is mapped to column 0 in dataVector. Each row in dataVector is adjusted to match the number of columns in columnIdentifiers either by truncating the Vector if it is too long, or adding null values if it is too short.

Note that passing in a null value for dataVector results in unspecified behavior, an possibly an exception.

Parameters:
dataVector - the new data vector
columnIdentifiers - the names of the columns
See Also:
getDataVector()

setDataVector

public void setDataVector(Object[][] dataVector,
                          Object[] columnIdentifiers)
Replaces the value in the dataVector instance variable with the values in the array dataVector. The first index in the Object[][] array is the row index and the second is the column index. columnIdentifiers are the names of the new columns.

Parameters:
dataVector - the new data vector
columnIdentifiers - the names of the columns
See Also:
setDataVector(Vector, Vector)

newDataAvailable

public void newDataAvailable(TableModelEvent event)
Equivalent to fireTableChanged.

Parameters:
event - the change event

newRowsAdded

public void newRowsAdded(TableModelEvent e)
Ensures that the new rows have the correct number of columns. This is accomplished by using the setSize method in Vector which truncates vectors which are too long, and appends nulls if they are too short. This method also sends out a tableChanged notification message to all the listeners.

Parameters:
e - this TableModelEvent describes where the rows were added. If null it assumes all the rows were newly added
See Also:
getDataVector()

rowsRemoved

public void rowsRemoved(TableModelEvent event)
Equivalent to fireTableChanged.

Parameters:
event - the change event

setNumRows

public void setNumRows(int rowCount)
Obsolete as of Java 2 platform v1.3. Please use setRowCount instead.


setRowCount

public void setRowCount(int rowCount)
Sets the number of rows in the model. If the new size is greater than the current size, new rows are added to the end of the model If the new size is less than the current size, all rows at index rowCount and greater are discarded.

Since:
1.3
See Also:
setColumnCount(int)

addRow

public void addRow(Vector rowData)
Adds a row to the end of the model. The new row will contain null values unless rowData is specified. Notification of the row being added will be generated.

Parameters:
rowData - optional data of the row being added

addRow

public void addRow(Object[] rowData)
Adds a row to the end of the model. The new row will contain null values unless rowData is specified. Notification of the row being added will be generated.

Parameters:
rowData - optional data of the row being added

insertRow

public void insertRow(int row,
                      Vector rowData)
Inserts a row at row in the model. The new row will contain null values unless rowData is specified. Notification of the row being added will be generated.

Parameters:
row - the row index of the row to be inserted
rowData - optional data of the row being added
Throws:
ArrayIndexOutOfBoundsException - if the row was invalid

insertRow

public void insertRow(int row,
                      Object[] rowData)
Inserts a row at row in the model. The new row will contain null values unless rowData is specified. Notification of the row being added will be generated.

Parameters:
row - the row index of the row to be inserted
rowData - optional data of the row being added
Throws:
ArrayIndexOutOfBoundsException - if the row was invalid

moveRow

public void moveRow(int start,
                    int end,
                    int to)
Moves one or more rows from the inclusive range start to end to the to position in the model. After the move, the row that was at index start will be at index to. This method will send a tableChanged notification message to all the listeners.

  Examples of moves:
  

1. moveRow(1,3,5); a|B|C|D|e|f|g|h|i|j|k - before a|e|f|g|h|B|C|D|i|j|k - after

2. moveRow(6,7,1); a|b|c|d|e|f|G|H|i|j|k - before a|G|H|b|c|d|e|f|i|j|k - after

Parameters:
start - the starting row index to be moved
end - the ending row index to be moved
to - the destination of the rows to be moved
Throws:
ArrayIndexOutOfBoundsException - if any of the elements would be moved out of the table's range

removeRow

public void removeRow(int row)
Removes the row at row from the model. Notification of the row being removed will be sent to all the listeners.

Parameters:
row - the row index of the row to be removed
Throws:
ArrayIndexOutOfBoundsException - if the row was invalid

setColumnIdentifiers

public void setColumnIdentifiers(Vector columnIdentifiers)
Replaces the column identifiers in the model. If the number of newIdentifiers is greater than the current number of columns, new columns are added to the end of each row in the model. If the number of newIdentifiers is less than the current number of columns, all the extra columns at the end of a row are discarded.

Parameters:
columnIdentifiers - vector of column identifiers. If null, set the model to zero columns
See Also:
setNumRows(int)

setColumnIdentifiers

public void setColumnIdentifiers(Object[] newIdentifiers)
Replaces the column identifiers in the model. If the number of newIdentifiers is greater than the current number of columns, new columns are added to the end of each row in the model. If the number of newIdentifiers is less than the current number of columns, all the extra columns at the end of a row are discarded.

Parameters:
newIdentifiers - array of column identifiers. If null, set the model to zero columns
See Also:
setNumRows(int)

setColumnCount

public void setColumnCount(int columnCount)
Sets the number of columns in the model. If the new size is greater than the current size, new columns are added to the end of the model with null cell values. If the new size is less than the current size, all columns at index columnCount and greater are discarded.

Parameters:
columnCount - the new number of columns in the model
Since:
1.3
See Also:
setColumnCount(int)

addColumn

public void addColumn(Object columnName)
Adds a column to the model. The new column will have the identifier columnName, which may be null. This method will send a tableChanged notification message to all the listeners. This method is a cover for addColumn(Object, Vector) which uses null as the data vector.

Parameters:
columnName - the identifier of the column being added

addColumn

public void addColumn(Object columnName,
                      Vector columnData)
Adds a column to the model. The new column will have the identifier columnName, which may be null. columnData is the optional vector of data for the column. If it is null the column is filled with null values. Otherwise, the new data will be added to model starting with the first element going to row 0, etc. This method will send a tableChanged notification message to all the listeners.

Parameters:
columnName - the identifier of the column being added
columnData - optional data of the column being added

addColumn

public void addColumn(Object columnName,
                      Object[] columnData)
Adds a column to the model. The new column will have the identifier columnName. columnData is the optional array of data for the column. If it is null the column is filled with null values. Otherwise, the new data will be added to model starting with the first element going to row 0, etc. This method will send a tableChanged notification message to all the listeners.

See Also:
addColumn(Object, Vector)

getRowCount

public int getRowCount()
Returns the number of rows in this data table.

Specified by:
getRowCount in interface TableModel
Returns:
the number of rows in the model
See Also:
TableModel.getColumnCount()

getColumnCount

public int getColumnCount()
Returns the number of columns in this data table.

Specified by:
getColumnCount in interface TableModel
Returns:
the number of columns in the model
See Also:
TableModel.getRowCount()

getColumnName

public String getColumnName(int column)
Returns the column name.

Specified by:
getColumnName in interface TableModel
Overrides:
getColumnName in class AbstractTableModel
Parameters:
column - the column being queried
Returns:
a name for this column using the string value of the appropriate member in columnIdentifiers. If columnIdentifiers does not have an entry for this index, returns the default name provided by the superclass.

isCellEditable

public boolean isCellEditable(int row,
                              int column)
Returns true regardless of parameter values.

Specified by:
isCellEditable in interface TableModel
Overrides:
isCellEditable in class AbstractTableModel
Parameters:
row - the row whose value is to be queried
column - the column whose value is to be queried
Returns:
true
See Also:
setValueAt(java.lang.Object, int, int)

getValueAt

public Object getValueAt(int row,
                         int column)
Returns an attribute value for the cell at row and column.

Specified by:
getValueAt in interface TableModel
Parameters:
row - the row whose value is to be queried
column - the column whose value is to be queried
Returns:
the value Object at the specified cell
Throws:
ArrayIndexOutOfBoundsException - if an invalid row or column was given

setValueAt

public void setValueAt(Object aValue,
                       int row,
                       int column)
Sets the object value for the cell at column and row. aValue is the new value. This method will generate a tableChanged notification.

Specified by:
setValueAt in interface TableModel
Overrides:
setValueAt in class AbstractTableModel
Parameters:
aValue - the new value; this can be null
row - the row whose value is to be changed
column - the column whose value is to be changed
Throws:
ArrayIndexOutOfBoundsException - if an invalid row or column was given
See Also:
TableModel.getValueAt(int, int), TableModel.isCellEditable(int, int)

convertToVector

protected static Vector convertToVector(Object[] anArray)
Returns a vector that contains the same objects as the array.

Parameters:
anArray - the array to be converted
Returns:
the new vector; if anArray is null, returns null

convertToVector

protected static Vector convertToVector(Object[][] anArray)
Returns a vector of vectors that contains the same objects as the array.

Parameters:
anArray - the double array to be converted
Returns:
the new vector of vectors; if anArray is null, returns null

Java™ Platform
Standard Ed. 6

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