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org.eclipse.ui.model
Class BaseWorkbenchContentProvider
java.lang.Object
org.eclipse.ui.model.BaseWorkbenchContentProvider
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All Implemented Interfaces:
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IContentProvider,
IStructuredContentProvider,
ITreeContentProvider
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Direct Known Subclasses:
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WorkbenchContentProvider
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public class BaseWorkbenchContentProvider
- extends
Object
- implements
ITreeContentProvider
Tree content provider for objects that can be adapted to the interface
IWorkbenchAdapter.
This class may be instantiated, or subclassed.
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Since:
- 3.0
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See Also:
-
IWorkbenchAdapter
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Method Summary
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void
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dispose
()
Disposes of this content provider. |
protected
IWorkbenchAdapter
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getAdapter
(
Object element)
Returns the implementation of IWorkbenchAdapter for the given
object. |
Object[]
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getChildren
(
Object element)
Returns the child elements of the given parent element. |
Object[]
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getElements
(
Object element)
Returns the elements to display in the viewer
when its input is set to the given element. |
Object
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getParent
(
Object element)
Returns the parent for the given element, or null
indicating that the parent can't be computed. |
boolean
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hasChildren
(
Object element)
Returns whether the given element has children. |
void
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inputChanged
(
Viewer viewer,
Object oldInput,
Object newInput)
Notifies this content provider that the given viewer's input
has been switched to a different element. |
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Methods inherited from class java.lang.
Object
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clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait
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BaseWorkbenchContentProvider
public BaseWorkbenchContentProvider()
- Creates a new workbench content provider.
dispose
public void dispose()
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Description copied from interface:
IContentProvider
- Disposes of this content provider.
This is called by the viewer when it is disposed.
The viewer should not be updated during this call, as it is in the process
of being disposed.
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Specified by:
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dispose
in interface
IContentProvider
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getAdapter
protected
IWorkbenchAdapter getAdapter(
Object element)
- Returns the implementation of IWorkbenchAdapter for the given
object. Returns null if the adapter is not defined or the
object is not adaptable.
-
-
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Parameters:
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element - the element
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Returns:
- the corresponding workbench adapter object
getChildren
public
Object[] getChildren(
Object element)
-
Description copied from interface:
ITreeContentProvider
- Returns the child elements of the given parent element.
The difference between this method and IStructuredContentProvider.getElements
is that getElements is called to obtain the
tree viewer's root elements, whereas getChildren is used
to obtain the children of a given parent element in the tree (including a root).
The result is not modified by the viewer.
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Specified by:
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getChildren
in interface
ITreeContentProvider
-
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Parameters:
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element - the parent element
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Returns:
- an array of child elements
getElements
public
Object[] getElements(
Object element)
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Description copied from interface:
IStructuredContentProvider
- Returns the elements to display in the viewer
when its input is set to the given element.
These elements can be presented as rows in a table, items in a list, etc.
The result is not modified by the viewer.
NOTE: For instances where the viewer is displaying a tree
containing a single 'root' element it is still necessary that the
'input' does not return itself from this method. This leads
to recursion issues (see bug 9262).
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Specified by:
-
getElements
in interface
IStructuredContentProvider
-
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Parameters:
-
element - the input element
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Returns:
- the array of elements to display in the viewer
getParent
public
Object getParent(
Object element)
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Description copied from interface:
ITreeContentProvider
- Returns the parent for the given element, or
null
indicating that the parent can't be computed.
In this case the tree-structured viewer can't expand
a given node correctly if requested.
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Specified by:
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getParent
in interface
ITreeContentProvider
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Parameters:
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element - the element
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Returns:
- the parent element, or
null if it
has none or if the parent cannot be computed
hasChildren
public boolean hasChildren(
Object element)
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Description copied from interface:
ITreeContentProvider
- Returns whether the given element has children.
Intended as an optimization for when the viewer does not
need the actual children. Clients may be able to implement
this more efficiently than getChildren.
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Specified by:
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hasChildren
in interface
ITreeContentProvider
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Parameters:
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element - the element
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Returns:
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true if the given element has children,
and false if it has no children
inputChanged
public void inputChanged(
Viewer viewer,
Object oldInput,
Object newInput)
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Description copied from interface:
IContentProvider
- Notifies this content provider that the given viewer's input
has been switched to a different element.
A typical use for this method is registering the content provider as a listener
to changes on the new input (using model-specific means), and deregistering the viewer
from the old input. In response to these change notifications, the content provider
should update the viewer (see the add, remove, update and refresh methods on the viewers).
The viewer should not be updated during this call, as it might be in the process
of being disposed.
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Specified by:
-
inputChanged
in interface
IContentProvider
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Parameters:
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viewer - the viewer -
oldInput - the old input element, or null if the viewer
did not previously have an input -
newInput - the new input element, or null if the viewer
does not have an input
Guidelines for using Eclipse APIs.
Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.
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