Package org.eclipse.jface.viewers

Class ViewerFilter

java.lang.Object

org.eclipse.jface.viewers.ViewerFilter

Direct Known Subclasses:

PatternFilter, ResourcePatternFilter, ResourceWorkingSetFilter

public abstract class ViewerFilter
extends Object

A viewer filter is used by a structured viewer to extract a subset of elements provided by its content provider.

Subclasses must implement the select method and may implement the isFilterProperty method.

See Also:

IStructuredContentProvider, StructuredViewer

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ViewerFilter()	Creates a new viewer filter.

Method Summary

Modifier and Type	Method	Description
Object[]	filter(Viewer viewer, Object parent, Object[] elements)	Filters the given elements for the given viewer.
Object[]	filter(Viewer viewer, TreePath parentPath, Object[] elements)	Filters the given elements for the given viewer.
boolean	isFilterProperty(Object element, String property)	Returns whether this viewer filter would be affected by a change to the given property of the given element.
abstract boolean	select(Viewer viewer, Object parentElement, Object element)	Returns whether the given element makes it through this filter.

Methods inherited from class java.lang.Object

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

Constructor Detail

ViewerFilter

protected ViewerFilter()

Creates a new viewer filter.

Method Detail

filter

public Object[] filter(Viewer viewer,
                       Object parent,
                       Object[] elements)

Filters the given elements for the given viewer. The input array is not modified.

The default implementation of this method calls select on each element in the array, and returns only those elements for which select returns true.

Parameters:

viewer - the viewer

parent - the parent element

elements - the elements to filter

Returns:

the filtered elements

filter

public Object[] filter(Viewer viewer,
                       TreePath parentPath,
                       Object[] elements)

Filters the given elements for the given viewer. The input array is not modified.

The default implementation of this method calls filter(Viewer, Object, Object[]) with the parent from the path. Subclasses may override

Parameters:

viewer - the viewer

parentPath - the path of the parent element

elements - the elements to filter

Returns:

the filtered elements

Since:

3.2

isFilterProperty

public boolean isFilterProperty(Object element,
                                String property)

Returns whether this viewer filter would be affected by a change to the given property of the given element.

The default implementation of this method returns false. Subclasses should reimplement.

Parameters:

element - the element

property - the property

Returns:

true if the filtering would be affected, and false if it would be unaffected

select

public abstract boolean select(Viewer viewer,
                               Object parentElement,
                               Object element)

Returns whether the given element makes it through this filter.

Parameters:

viewer - the viewer

parentElement - the parent element

element - the element

Returns:

true if element is included in the filtered set, and false if excluded