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Eclipse Platform
Release 3.0

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org.eclipse.compare.structuremergeviewer
Class DiffNode

java.lang.Object
  org.eclipse.compare.structuremergeviewer.DiffElement
      org.eclipse.compare.structuremergeviewer.DiffContainer
          org.eclipse.compare.structuremergeviewer.DiffNode

All Implemented Interfaces:

ICompareInput, IDiffContainer, IDiffElement, ITypedElement

public class DiffNode

extends DiffContainer

implements ITypedElement, ICompareInput

Diff node are used as the compare result of the differencing engine. Since it implements the ITypedElement and ICompareInput interfaces it can be used directly to display the compare result in a DiffTreeViewer and as the input to any other compare/merge viewer.

DiffNodes are typically created as the result of performing a compare with the Differencer.

Clients typically use this class as is, but may subclass if required.

See Also:

DiffTreeViewer, Differencer

Field Summary

Fields inherited from interface org.eclipse.compare.ITypedElement

FOLDER_TYPE, TEXT_TYPE, UNKNOWN_TYPE

Constructor Summary

DiffNode(IDiffContainer parent, int kind)
Creates a new DiffNode and initializes with the given values.

DiffNode(IDiffContainer parent, int kind, ITypedElement ancestor, ITypedElement left, ITypedElement right)
Creates a new DiffNode and initializes with the given values.

DiffNode(int kind)
Creates a new DiffNode with the given diff kind.

DiffNode(int kind, ITypedElement ancestor, ITypedElement left, ITypedElement right)
Creates a new DiffNode and initializes with the given values.

DiffNode(ITypedElement left, ITypedElement right)
Creates a new DiffNode with diff kind Differencer.CHANGE and initializes with the given values.

Method Summary

void	addCompareInputChangeListener(ICompareInputChangeListener listener) Registers a listener for changes of this ICompareInput.
void	copy(boolean leftToRight) Copy one side (source) to the other side (destination) depending on the value of leftToRight.
boolean	dontExpand() Returns true if this node shouldn't automatically be expanded in a DiffTreeViewer.
boolean	equals(Object other)
protected void	fireChange() Sends out notification that a change has occured on the ICompareInput.
ITypedElement	getAncestor() Returns the ancestor side of this input.
ITypedElement	getId() Returns the first not-null input of this node.
Image	getImage() Returns an image for this object.
ITypedElement	getLeft() Returns the left side of this input.
String	getName() Returns the (non-null) name of the left or right side if they are identical.
ITypedElement	getRight() Returns the right side of this input.
String	getType() Returns the type of this object.
int	hashCode()
void	removeCompareInputChangeListener(ICompareInputChangeListener listener) Unregisters a ICompareInput listener.
void	setAncestor(ITypedElement ancestor) Sets the ancestor input to the given value.
void	setDontExpand(boolean dontExpand) Controls whether this node is not automatically expanded when displayed in a DiffTreeViewer.
void	setLeft(ITypedElement left) Sets the left input to the given value.
void	setRight(ITypedElement right) Sets the right input to the given value.

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

add, findChild, getChildren, hasChildren, remove, removeToRoot

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

getKind, getParent, setKind, setParent

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.compare.structuremergeviewer.ICompareInput

getKind

Methods inherited from interface org.eclipse.compare.structuremergeviewer.IDiffElement

getKind, getParent, setParent

Constructor Detail

DiffNode

public DiffNode(IDiffContainer parent,
                int kind,
                ITypedElement ancestor,
                ITypedElement left,
                ITypedElement right)

Creates a new DiffNode and initializes with the given values.

Parameters:

parent - under which the new container is added as a child or null

kind - of difference (defined in Differencer)

ancestor - the common ancestor input to a compare

left - the left input to a compare

right - the right input to a compare

DiffNode

public DiffNode(ITypedElement left,
                ITypedElement right)

Creates a new DiffNode with diff kind Differencer.CHANGE and initializes with the given values.

Parameters:

left - the left input to a compare

right - the right input to a compare

DiffNode

public DiffNode(int kind,
                ITypedElement ancestor,
                ITypedElement left,
                ITypedElement right)

Creates a new DiffNode and initializes with the given values.

Parameters:

kind - of difference (defined in Differencer)

ancestor - the common ancestor input to a compare

left - the left input to a compare

right - the right input to a compare

DiffNode

public DiffNode(int kind)

Creates a new DiffNode with the given diff kind.

Parameters:

kind - of difference (defined in Differencer)

DiffNode

public DiffNode(IDiffContainer parent,
                int kind)

Creates a new DiffNode and initializes with the given values.

Parameters:

parent - under which the new container is added as a child or null

kind - of difference (defined in Differencer)

Method Detail

addCompareInputChangeListener

public void addCompareInputChangeListener(ICompareInputChangeListener listener)

Registers a listener for changes of this ICompareInput. Has no effect if an identical listener is already registered.

Specified by:

addCompareInputChangeListener in interface ICompareInput

Parameters:

listener - the listener to add

removeCompareInputChangeListener

public void removeCompareInputChangeListener(ICompareInputChangeListener listener)

Unregisters a ICompareInput listener. Has no effect if listener is not registered.

Specified by:

removeCompareInputChangeListener in interface ICompareInput

Parameters:

listener - the listener to remove

fireChange

protected void fireChange()

Sends out notification that a change has occured on the ICompareInput.

dontExpand

public boolean dontExpand()

Returns true if this node shouldn't automatically be expanded in a DiffTreeViewer.

Returns:

true if node shouldn't automatically be expanded

setDontExpand

public void setDontExpand(boolean dontExpand)

Controls whether this node is not automatically expanded when displayed in a DiffTreeViewer.

Parameters:

dontExpand - if true this node is not automatically expanded in DiffTreeViewer

getId

public ITypedElement getId()

Returns the first not-null input of this node. Method checks the three inputs in the order: ancestor, right, left.

Returns:

the first not-null input of this node

getName

public String getName()

Returns the (non-null) name of the left or right side if they are identical. Otherwise both names are concatenated (separated with a slash ('/')).

Subclasses may re-implement to provide a different name for this node.

Specified by:

getName in interface ITypedElement

Returns:

the name of this object

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

Overrides:

getImage in class DiffElement

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

Overrides:

getType in class DiffElement

setAncestor

public void setAncestor(ITypedElement ancestor)

Sets the ancestor input to the given value.

Parameters:

ancestor - the new value for the ancestor input

Since:

3.0

getAncestor

public ITypedElement getAncestor()

Description copied from interface: ICompareInput

Returns the ancestor side of this input. Returns null if this input has no ancestor or in the two-way compare case.

Specified by:

getAncestor in interface ICompareInput

Returns:

the ancestor of this input, or null

setLeft

public void setLeft(ITypedElement left)

Sets the left input to the given value.

Parameters:

left - the new value for the left input

getLeft

public ITypedElement getLeft()

Description copied from interface: ICompareInput

Returns the left side of this input. Returns null if there is no left side (deletion or addition).

Specified by:

getLeft in interface ICompareInput

Returns:

the left side of this input, or null

setRight

public void setRight(ITypedElement right)

Sets the right input to the given value.

Parameters:

right - the new value for the right input

getRight

public ITypedElement getRight()

Description copied from interface: ICompareInput

Returns the right side of this input. Returns null if there is no right side (deletion or addition).

Specified by:

getRight in interface ICompareInput

Returns:

the right side of this input, or null

copy

public void copy(boolean leftToRight)

Description copied from interface: ICompareInput

Copy one side (source) to the other side (destination) depending on the value of leftToRight. This method is called from a merge viewer if a corresponding action ("take left" or "take right") has been pressed.

The implementation should handle the following cases:

• if the source side is null the destination must be deleted,
• if the destination is null the destination must be created and filled with the contents from the source,
• if both sides are non-null the contents of source must be copied to destination.

In addition the implementation should send out notification to the registered ICompareInputChangeListener.

Specified by:

copy in interface ICompareInput

Parameters:

leftToRight - if true the left side is copied to the right side. If false the right side is copied to the left side

hashCode

public int hashCode()

equals

public boolean equals(Object other)