Package org.eclipse.compare.structuremergeviewer

Class StructureRootNode

java.lang.Object

org.eclipse.compare.structuremergeviewer.DocumentRangeNode

org.eclipse.compare.structuremergeviewer.StructureRootNode

All Implemented Interfaces:

IDocumentRange, IEditableContent, IEditableContentExtension, IEncodedStreamContentAccessor, IStreamContentAccessor, ITypedElement, IStructureComparator, IAdaptable, IDisposable

public class StructureRootNode
extends DocumentRangeNode
implements IDisposable, ITypedElement

A node that acts as the root of the tree returned from a StructureCreator. This node performs the following tasks tasks:

1. It adapts to an ISharedDocumentAdapter that provides the proper document key (@see getAdapter(Class)).
2. It invokes IStructureCreator.save(IStructureComparator, Object) when nodeChanged(DocumentRangeNode) is called.
3. It disposes of the IDisposable provided in the constructor when dispose() is called.

This class may be subclassed by clients.

Since:

3.3

Field Summary

Fields

Modifier and Type	Field	Description
static final String	ROOT_ID	The string constant (value "root") that is used as the id of the root node.
static final int	ROOT_TYPE	The integer constant (value 0) that is used as the type code of the root node.

Fields inherited from interface org.eclipse.compare.contentmergeviewer.IDocumentRange

RANGE_CATEGORY

Fields inherited from interface org.eclipse.compare.ITypedElement

FOLDER_TYPE, TEXT_TYPE, UNKNOWN_TYPE

Constructor Summary

Constructors

Constructor	Description
StructureRootNode(IDocument document, Object input, StructureCreator creator, ISharedDocumentAdapter adapter)	Create the structure root node.

Method Summary

Modifier and Type	Method	Description
void	dispose()	Disposes of this service.
<T> T	getAdapter(Class<T> adapter)	Override IAdaptable.getAdapter(Class) in order to provide an ISharedDocumentAdapter that provides the proper look up key based on the input from which this structure node was created.
Image	getImage()	Returns an image for this object.
String	getName()	Returns the name of this object.
String	getType()	Returns the type of this object.
boolean	isReadOnly()	Return whether the typed element being displayed is read-only. a read-only element will require a call to validateEdit before the element can be modified on disk.
protected void	nodeChanged(DocumentRangeNode node)	Override in order to invoke IStructureCreator.save(IStructureComparator, Object) when the contents of a node have changed.
ITypedElement	replace(ITypedElement child, ITypedElement other)	This method is called on a parent to add or remove a child, or to copy the contents of a child.
IStatus	validateEdit(Shell shell)	If the element is read-only, this method should be called to attempt to make it writable.

Methods inherited from class org.eclipse.compare.structuremergeviewer.DocumentRangeNode

addChild, equals, getAppendPosition, getCharset, getChildren, getContents, getDocument, getId, getParentNode, getRange, getTypeCode, hashCode, internalSetContents, isEditable, setAppendPosition, setContent, setId, setLength

Methods inherited from class java.lang.Object

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

Field Details

ROOT_TYPE

public static final int ROOT_TYPE

The integer constant (value 0) that is used as the type code of the root node.

See Also:

• DocumentRangeNode.getTypeCode()
• Constant Field Values

ROOT_ID

public static final String ROOT_ID

The string constant (value "root") that is used as the id of the root node.

See Also:

• DocumentRangeNode.getId()
• Constant Field Values

Constructor Details

StructureRootNode

public StructureRootNode(IDocument document,
 Object input,
 StructureCreator creator,
 ISharedDocumentAdapter adapter)

Create the structure root node.

Parameters:

document - the document

input - the input associated with the document

creator - the structure creator that is creating the node

adapter - the shared document adapter from which the document was obtained or null if the document was not obtained from an ISharedDocumentAdapter

Method Details

dispose

public void dispose()

Description copied from interface: IDisposable

Disposes of this service. All resources must be freed. All listeners must be detached. Dispose will only be called once during the life cycle of a service.

Specified by:

dispose in interface IDisposable

getAdapter

public <T> T getAdapter(Class<T> adapter)

Override IAdaptable.getAdapter(Class) in order to provide an ISharedDocumentAdapter that provides the proper look up key based on the input from which this structure node was created.

Specified by:

getAdapter in interface IAdaptable

Overrides:

getAdapter in class DocumentRangeNode

Type Parameters:

T - the class type

Parameters:

adapter - the adapter class to look up

Returns:

the object adapted to the given class or null

See Also:

• IAdaptable.getAdapter(Class)

nodeChanged

protected void nodeChanged(DocumentRangeNode node)

Override in order to invoke IStructureCreator.save(IStructureComparator, Object) when the contents of a node have changed.

Overrides:

nodeChanged in class DocumentRangeNode

Parameters:

node - the changed node

replace

public ITypedElement replace(ITypedElement child,
 ITypedElement other)

Description copied from interface: IEditableContent

This method is called on a parent to add or remove a child, or to copy the contents of a child. What to do is encoded in the two arguments as follows:

add:	dest == null	src != null
remove:	dest != null	src == null
copy:	dest != null	src != null

Specified by:

replace in interface IEditableContent

Overrides:

replace in class DocumentRangeNode

Parameters:

child - the existing child of this object to be replaced; if null a new child can be added.

other - the new child to be added or replaced; if null an existing child can be removed.

Returns:

the argument dest

getImage

public Image getImage()

Description copied from interface: ITypedElement

Returns an image for this object. This image is used when displaying this object in the UI.

Specified by:

getImage in interface ITypedElement

Returns:

the image of this object or null if this type of input has no image

getName

public String getName()

Description copied from interface: ITypedElement

Returns the name of this object. The name is used when displaying this object in the UI.

Specified by:

getName in interface ITypedElement

Returns:

the name of this object

getType

public String getType()

Description copied from interface: ITypedElement

Returns the type of this object. For objects with a file name this is typically the file extension. For folders its the constant FOLDER_TYPE. The type is used for determining a suitable viewer for this object.

Specified by:

getType in interface ITypedElement

Returns:

the type of this object

isReadOnly

public boolean isReadOnly()

Description copied from interface: IEditableContentExtension

Return whether the typed element being displayed is read-only. a read-only element will require a call to validateEdit before the element can be modified on disk.

Specified by:

isReadOnly in interface IEditableContentExtension

Overrides:

isReadOnly in class DocumentRangeNode

Returns:

whether the typed element is read-only

validateEdit

public IStatus validateEdit(Shell shell)

Description copied from interface: IEditableContentExtension

If the element is read-only, this method should be called to attempt to make it writable.

Specified by:

validateEdit in interface IEditableContentExtension

Overrides:

validateEdit in class DocumentRangeNode

Parameters:

shell - a shell used to prompt the user if required.

Returns:

a status object that is OK if things are fine, otherwise a status describing reasons why modifying the given files is not reasonable. A status with a severity of CANCEL is returned if the validation was canceled, indicating the edit should not proceed.