org.jdesktop.swingx.decorator
Class ComponentAdapter

java.lang.Object
  org.jdesktop.swingx.decorator.ComponentAdapter

Direct Known Subclasses:

JXList.ListAdapter, JXTable.TableAdapter, JXTree.TreeAdapter

public abstract class ComponentAdapter
extends Object

Abstract base class for all component data adapter classes. A ComponentAdapter allows a Filter, Sorter, or Highlighter to interact with a target component through a common API. It has two aspects:

• interact with the view state for a given data element. The row/cloumn fields and the parameterless methods service this aspect. The coordinates are in view coordinate system. Typical clients of this service are HighlightPredicates and Highlighters.
• interact with the data of the component. The methods for this are those taking row/column indices as parameters. The coordinates are in model coordinate system. Typical clients of this service are Filters.

Typically, application code is interested in the first aspect. An example is highlighting the background of a row in a JXTable based on the value of a cell in a specific column. The solution is to implement a custom HighlightPredicate which decides if a given cell should be highlighted and configure a ColorHighlighter with the predicate and an appropriate background color.

 HighlightPredicate feverWarning = new HighlightPredicate() {
     int temperatureColumn = 10;
 
     public boolean isHighlighted(Component component, ComponentAdapter adapter) {
         return hasFever(adapter.getValue(temperatureColumn));
     }
 
     private boolean hasFever(Object value) {
         if (!value instanceof Number)
             return false;
         return ((Number) value).intValue() > 37;
     }
 };
 
 Highlighter hl = new ColorHighlighter(feverWarning, Color.RED, null);
 

The adapter is responsible for mapping column coordinates. All input column indices are in model coordinates with exactly two exceptions:

• column in column view coordinates
• the mapping method viewToModel(int) in view coordinates

All input row indices are in model coordinates with exactly three exceptions:

• row in row view coordinates
• the getter for the filtered value getFilteredValueAt(int, int) takes the row in view coordinates.
• the getter for the filtered string representation getFilteredStringAt(int, int) takes the row in view coordinates.

PENDING JW: add model-index based access to string rep.

PENDING JW: anything to gain by generics here?

PENDING JW: formally document that row/column coordinates must be valid in all methods taking model coordinates, that is 0<= row < getRowCount().

See Also:

HighlightPredicate, Highlighter, Filter

Field Summary

int	column current column in view coordinates.
static Object	DEFAULT_COLUMN_IDENTIFIER
int	row current row in view coordinates.
protected JComponent	target

Constructor Summary

ComponentAdapter(JComponent component)
Constructs a ComponentAdapter, setting the specified component as the target component.

Method Summary

int	getColumnCount() Returns the number of columns in the target's data model.
Object	getColumnIdentifierAt(int columnIndex) Returns logical identifier of the column at columnIndex in model coordinates.
int	getColumnIndex(Object identifier) Returns the column index in model coordinates for the logical identifier.
String	getColumnName(int columnIndex) Returns the column's display name (= headerValue) of the column at columnIndex in model coordinates.
JComponent	getComponent() Returns the component which is this adapter's target.
int	getDepth() Returns the depth of this row in the hierarchy where the root is 0.
String	getFilteredStringAt(int row, int column) Returns the String representation of the filtered value of the cell identified by the row in view coordinate and the column in model coordinates.
abstract Object	getFilteredValueAt(int row, int column) Returns the filtered value of the cell identified by the row in view coordinate and the column in model coordinates.
int	getRowCount() Returns the number of rows in the target's data model.
String	getString() Returns the String representation of the value of the cell identified by this adapter.
String	getString(int modelColumnIndex) Returns the String representation of the value of the cell identified by the current adapter row and the given column index in model coordinates.
String	getStringAt(int row, int column) Returns the String representation of the value of the cell identified by the row specified row and column in model coordinates.
Object	getValue() Returns the value of the cell identified by this adapter.
Object	getValue(int modelColumnIndex) Returns the value of the cell identified by the current adapter row and the given column index in model coordinates.
abstract Object	getValueAt(int row, int column) Returns the value of the target component's cell identified by the specified row and column in model coordinates.
abstract boolean	hasFocus() Returns true if the cell identified by this adapter currently has focus.
abstract boolean	isCellEditable(int row, int column) Determines whether this cell is editable.
abstract boolean	isEditable() Returns true if the cell identified by this adapter is editable, false otherwise.
boolean	isExpanded() Returns true if the cell identified by this adapter is currently expanded.
boolean	isHierarchical() Returns true if the cell identified by this adapter displays the hierarchical node.
boolean	isLeaf() Returns true if the cell identified by this adapter is a leaf node.
abstract boolean	isSelected() Returns true if the cell identified by this adapter is currently selected.
boolean	isTestable(int column) Returns true if the column should be included in testing.
int	modelToView(int columnIndex) For target components that support multiple columns in their model, along with column reordering in the view, this method transforms the specified columnIndex from model coordinates to view coordinates.
void	refresh() Updates the target component on screen.
abstract void	setValueAt(Object aValue, int row, int column) Sets the value of the target component's cell identified by the specified row and column in model coordinates.
int	viewToModel(int columnIndex) For target components that support multiple columns in their model, along with column reordering in the view, this method transforms the specified columnIndex from view coordinates to model coordinates.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_COLUMN_IDENTIFIER

public static final Object DEFAULT_COLUMN_IDENTIFIER

row

public int row

current row in view coordinates.

column

public int column

current column in view coordinates.

target

protected final JComponent target

Constructor Detail

ComponentAdapter

public ComponentAdapter(JComponent component)

Constructs a ComponentAdapter, setting the specified component as the target component.

Parameters:

component - target component for this adapter

Method Detail

getComponent

public JComponent getComponent()

Returns the component which is this adapter's target.

Returns:

the component which is this adapter's target.

getColumnName

public String getColumnName(int columnIndex)

Returns the column's display name (= headerValue) of the column at columnIndex in model coordinates. Used f.i. in SearchPanel to fill the field with the column name.

Note: it's up to the implementation to decide for which columns it returns a name - most will do so for the subset with isTestable = true. This implementation delegates to getColumnIdentifierAt and returns it's toString or null.

Parameters:

columnIndex - in model coordinates

Returns:

column name or null if not found

getColumnIdentifierAt

public Object getColumnIdentifierAt(int columnIndex)

Returns logical identifier of the column at columnIndex in model coordinates. Note: it's up to the implementation to decide for which columns it returns an identifier - most will do so for the subset with isTestable = true.

This implementation returns DEFAULT_COLUMN_IDENTIFIER. PENDING JW: This method replaces the old getColumnIdentifier(int) which returned a String which is overly restrictive. The only way to gently replace this method was to add this with a different name - which makes this name suboptimal. Probably should rename again once the old has died out ;-)

Parameters:

columnIndex - in model coordinates, must be valid.

Returns:

the identifier of the column at columnIndex or null if it has none.

Throws:

ArrayIndexOutOfBoundsException - if columnIndex < 0 or columnIndex >= getColumnCount().

See Also:

getColumnIndex(Object)

getColumnIndex

public int getColumnIndex(Object identifier)

Returns the column index in model coordinates for the logical identifier.

This implementation returns 0 if the identifier is the same as the one known identifier returned from getColumnIdentifierAt(0), or -1 otherwise. So subclasses with one column and a customizable identifier need not override. Subclasses which support multiple columns must override this as well to keep the contract as in (assuming that the lookup succeeded):

  Object id = getColumnIdentifierAt(index);
  assertEquals(index, getColumnIndex(index);
  // and the reverse 
  int column = getColumnIndex(identifier);
  assertEquals(identifier, getColumnIdentifierAt(column));
 

Parameters:

identifier - the column's identifier, must not be null

Returns:

the index of the column identified by identifier in model coordinates or -1 if no column with the given identifier is found.

Throws:

NullPointerException - if identifier is null.

See Also:

getColumnIdentifierAt(int)

getColumnCount

public int getColumnCount()

Returns the number of columns in the target's data model.

Returns:

the number of columns in the target's data model.

getRowCount

public int getRowCount()

Returns the number of rows in the target's data model.

Returns:

the number of rows in the target's data model.

getValueAt

public abstract Object getValueAt(int row,
                                  int column)

Returns the value of the target component's cell identified by the specified row and column in model coordinates.

Parameters:

row - in model coordinates

column - in model coordinates

Returns:

the value of the target component's cell identified by the specified row and column

setValueAt

public abstract void setValueAt(Object aValue,
                                int row,
                                int column)

Sets the value of the target component's cell identified by the specified row and column in model coordinates.

Parameters:

aValue - the value to set

row - in model coordinates

column - in model coordinates

isCellEditable

public abstract boolean isCellEditable(int row,
                                       int column)

Determines whether this cell is editable.

Parameters:

row - the row to query in model coordinates

column - the column to query in model coordinates

Returns:

true if the cell is editable, false otherwise

isTestable

public boolean isTestable(int column)

Returns true if the column should be included in testing.

Here: returns true if visible (that is modelToView gives a valid view column coordinate).

Parameters:

column - the column index in model coordinates

Returns:

true if the column should be included in testing

getString

public String getString()

Returns the String representation of the value of the cell identified by this adapter. That is, for the at position (adapter.row, adapter.column) in view coordinates.

NOTE: this implementation assumes that view coordinates == model coordinates, that is simply calls getValueAt(this.row, this.column). It is up to subclasses to override appropriately is they support model/view coordinate transformation.

This implementation messages the StringValue.TO_STRING with the getValue, subclasses should re-implement and use the api appropriate for the target component type.

Returns:

the String representation of value of the cell identified by this adapter

See Also:

getValueAt(int, int), getFilteredValueAt(int, int), getValue(int)

getString

public String getString(int modelColumnIndex)

Returns the String representation of the value of the cell identified by the current adapter row and the given column index in model coordinates.

Parameters:

modelColumnIndex - the column index in model coordinates

Returns:

the String representation of the value of the cell identified by this adapter

See Also:

getFilteredStringAt(int, int), getString()

getFilteredStringAt

public String getFilteredStringAt(int row,
                                  int column)

Returns the String representation of the filtered value of the cell identified by the row in view coordinate and the column in model coordinates.

Note: the asymetry of the coordinates is intentional - clients like Highlighters are interested in view values but might need to access non-visible columns for testing. While it is possible to access row coordinates different from the current (that is this.row) it is not safe to do so for row > this.row because the adapter doesn't allow to query the count of visible rows.

This implementation messages the StringValue.TO_STRING with the filteredValue, subclasses should re-implement and use the api appropriate for the target component type.

PENDING JW: what about null cell values? StringValue has a contract to return a empty string then, would that be okay here as well?

Parameters:

row - the row of the cell in view coordinates

column - the column of the cell in model coordinates.

Returns:

the String representation of the filtered value of the cell identified by the row in view coordinate and the column in model coordiantes

getStringAt

public String getStringAt(int row,
                          int column)

Returns the String representation of the value of the cell identified by the row specified row and column in model coordinates.

This implementation messages the StringValue.TO_STRING with the valueAt, subclasses should re-implement and use the api appropriate for the target component type.

Parameters:

row - in model coordinates

column - in model coordinates

Returns:

the value of the target component's cell identified by the specified row and column

getValue

public Object getValue()

Returns the value of the cell identified by this adapter. That is, for the at position (adapter.row, adapter.column) in view coordinates.

NOTE: this implementation assumes that view coordinates == model coordinates, that is simply calls getValueAt(this.row, this.column). It is up to subclasses to override appropriately is they support model/view coordinate transformation.

Returns:

the value of the cell identified by this adapter

See Also:

getValueAt(int, int), getFilteredValueAt(int, int), getValue(int)

getValue

public Object getValue(int modelColumnIndex)

Returns the value of the cell identified by the current adapter row and the given column index in model coordinates.

Parameters:

modelColumnIndex - the column index in model coordinates

Returns:

the value of the cell identified by this adapter

See Also:

getValueAt(int, int), getFilteredValueAt(int, int), getValue(int)

getFilteredValueAt

public abstract Object getFilteredValueAt(int row,
                                          int column)

Returns the filtered value of the cell identified by the row in view coordinate and the column in model coordinates. Note: the asymetry of the coordinates is intentional - clients like Highlighters are interested in view values but might need to access non-visible columns for testing. While it is possible to access row coordinates different from the current (that is this.row) it is not safe to do so for row > this.row because the adapter doesn't allow to query the count of visible rows.

Parameters:

row - the row of the cell in view coordinates

column - the column of the cell in model coordinates.

Returns:

the filtered value of the cell identified by the row in view coordinate and the column in model coordiantes

hasFocus

public abstract boolean hasFocus()

Returns true if the cell identified by this adapter currently has focus. Otherwise, it returns false.

Returns:

true if the cell identified by this adapter currently has focus; Otherwise, return false

isSelected

public abstract boolean isSelected()

Returns true if the cell identified by this adapter is currently selected. Otherwise, it returns false.

Returns:

true if the cell identified by this adapter is currently selected; Otherwise, return false

isEditable

public abstract boolean isEditable()

Returns true if the cell identified by this adapter is editable, false otherwise.

Returns:

true if the cell is editable, false otherwise

isExpanded

public boolean isExpanded()

Returns true if the cell identified by this adapter is currently expanded. Otherwise, it returns false. For components that do not support hierarchical data, this method always returns true because the cells in such components can never be collapsed.

Returns:

true if the cell identified by this adapter is currently expanded; Otherwise, return false

isLeaf

public boolean isLeaf()

Returns true if the cell identified by this adapter is a leaf node. Otherwise, it returns false. For components that do not support hierarchical data, this method always returns true because the cells in such components can never have children.

Returns:

true if the cell identified by this adapter is a leaf node; Otherwise, return false

isHierarchical

public boolean isHierarchical()

Returns true if the cell identified by this adapter displays the hierarchical node. Otherwise, it returns false. For components that do not support hierarchical data, this method always returns false because the cells in such components can never have children.

Returns:

true if the cell identified by this adapter displays the hierarchical node; Otherwise, return false

getDepth

public int getDepth()

Returns the depth of this row in the hierarchy where the root is 0. For components that do not contain hierarchical data, this method returns 1.

Returns:

the depth for this adapter

modelToView

public int modelToView(int columnIndex)

For target components that support multiple columns in their model, along with column reordering in the view, this method transforms the specified columnIndex from model coordinates to view coordinates. For all other types of target components, this method returns the columnIndex unchanged.

Parameters:

columnIndex - index of a column in model coordinates

Returns:

index of the specified column in view coordinates

viewToModel

public int viewToModel(int columnIndex)

For target components that support multiple columns in their model, along with column reordering in the view, this method transforms the specified columnIndex from view coordinates to model coordinates. For all other types of target components, this method returns the columnIndex unchanged.

Parameters:

columnIndex - index of a column in view coordinates

Returns:

index of the specified column in model coordinates

refresh

public void refresh()

Updates the target component on screen. This implementation revalidates and repaints.