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Eclipse Platform
Release 3.5
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org.eclipse.jface.viewers
Class StructuredSelection


java.lang.Object
  extended by 
org.eclipse.jface.viewers.StructuredSelection
All Implemented Interfaces:
ISelection, IStructuredSelection
Direct Known Subclasses:
TreeSelection 
public class StructuredSelection

extends 
Object

implements 
IStructuredSelection

A concrete implementation of the IStructuredSelection interface, suitable for instantiating.

This class is not intended to be subclassed.

Restriction:
This class is not intended to be subclassed by clients.

Field Summary
static  StructuredSelection EMPTY
          The canonical empty selection.
 
Constructor Summary
StructuredSelection ()
          Creates a new empty selection.
StructuredSelection ( List elements)
          Creates a structured selection from the given List.
StructuredSelection ( List elements, IElementComparer comparer)
          Creates a structured selection from the given List and element comparer.
StructuredSelection ( Object element)
          Creates a structured selection containing a single object.
StructuredSelection ( Object[] elements)
          Creates a structured selection from the given elements.
 
Method Summary
 boolean equals ( Object o)
          Returns whether this structured selection is equal to the given object.
  Object getFirstElement ()
          Returns the first element in this selection, or null if the selection is empty.
 boolean isEmpty ()
          Returns whether this selection is empty.
  Iterator iterator ()
          Returns an iterator over the elements of this selection.
 int size ()
          Returns the number of elements selected in this selection.
  Object[] toArray ()
          Returns the elements in this selection as an array.
  List toList ()
          Returns the elements in this selection as a List.
  String toString ()
          Internal method which returns a string representation of this selection suitable for debug purposes only.
 
Methods inherited from class java.lang. Object
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

EMPTY

public static final 
StructuredSelection EMPTY
The canonical empty selection. This selection should be used instead of null.

Constructor Detail

StructuredSelection

public StructuredSelection()
Creates a new empty selection. See also the static field EMPTY which contains an empty selection singleton.

See Also:
EMPTY

StructuredSelection

public StructuredSelection(
Object[] elements)
Creates a structured selection from the given elements. The given element array must not be null.

Parameters:
elements - an array of elements

StructuredSelection

public StructuredSelection(
Object element)
Creates a structured selection containing a single object. The object must not be null.

Parameters:
element - the element

StructuredSelection

public StructuredSelection(
List elements)
Creates a structured selection from the given List.

Parameters:
elements - list of selected elements

StructuredSelection

public StructuredSelection(
List elements,
                           
IElementComparer comparer)
Creates a structured selection from the given List and element comparer. If an element comparer is provided, it will be used to determine equality between structured selection objects provided that they both are based on the same (identical) comparer. See bug

Parameters:
elements - list of selected elements
comparer - the comparer, or null
Since:
3.4
Method Detail

equals

public boolean equals(
Object o)
Returns whether this structured selection is equal to the given object. Two structured selections are equal if they contain the same elements in the same order.

Overrides:
equals in class Object
Parameters:
o - the other object
Returns:
true if they are equal, and false otherwise

getFirstElement

public 
Object getFirstElement()
Description copied from interface: IStructuredSelection
Returns the first element in this selection, or null if the selection is empty.

Specified by:
getFirstElement in interface IStructuredSelection
Returns:
an element, or null if none

isEmpty

public boolean isEmpty()
Description copied from interface: ISelection
Returns whether this selection is empty.

Specified by:
isEmpty in interface ISelection
Returns:
true if this selection is empty, and false otherwise

iterator

public 
Iterator iterator()
Description copied from interface: IStructuredSelection
Returns an iterator over the elements of this selection.

Specified by:
iterator in interface IStructuredSelection
Returns:
an iterator over the selected elements

size

public int size()
Description copied from interface: IStructuredSelection
Returns the number of elements selected in this selection.

Specified by:
size in interface IStructuredSelection
Returns:
the number of elements selected

toArray

public 
Object[] toArray()
Description copied from interface: IStructuredSelection
Returns the elements in this selection as an array.

Specified by:
toArray in interface IStructuredSelection
Returns:
the selected elements as an array

toList

public 
List toList()
Description copied from interface: IStructuredSelection
Returns the elements in this selection as a List. Note In the default implementation of IStructuredSelection.toList() in StructuredSelection the returned list is not a copy of the elements of the receiver and modifying it will modify the contents of the selection.

Specified by:
toList in interface IStructuredSelection
Returns:
the selected elements as a list

toString

public 
String toString()
Internal method which returns a string representation of this selection suitable for debug purposes only.

Overrides:
toString in class Object
Returns:
debug string
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