ICompareInput

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org.eclipse.compare.structuremergeviewer
Interface ICompareInput

All Known Implementing Classes:: DiffNode

public interface ICompareInput

Interface for objects used as input to a two-way or three-way compare viewer. It defines API for accessing the three sides for the compare, and a name and image which is used when displaying the three way input in the UI, for example, in a title bar.

Note: at most two sides of an ICompareInput can be null, (as it is normal for additions or deletions) but not all three.

ICompareInput provides methods for registering ICompareInputChangeListeners that get informed if one (or more) of the three sides of an ICompareInput object changes its value.

For example when accepting an incoming addition the (non-null) left side of an ICompareInput is copied to the right side by means of method copy. This should trigger a call to compareInputChanged of registered ICompareInputChangeListeners.

Clients can implement this interface, or use the convenience implementation DiffNode.

Method Summary

void addCompareInputChangeListener(ICompareInputChangeListener listener)
          Registers the given listener for notification.

void copy(boolean leftToRight)
          Copy one side (source) to the other side (destination) depending on the value of leftToRight.

org.eclipse.compare.ITypedElement getAncestor()
          Returns the ancestor side of this input.

org.eclipse.swt.graphics.Image getImage()
          Returns an image representing this input.

int getKind()
          Returns the kind of difference between the three sides ancestor, left and right.

org.eclipse.compare.ITypedElement getLeft()
          Returns the left side of this input.

java.lang.String getName()
          Returns name of input.

org.eclipse.compare.ITypedElement getRight()
          Returns the right side of this input.

void removeCompareInputChangeListener(ICompareInputChangeListener listener)
          Unregisters the given listener.

Method Detail

getName

public java.lang.String getName()

Returns name of input. This name is displayed when this input is shown in a viewer. In many cases this name is the name of one of the non-null sides or a combination thereof.

getImage

public org.eclipse.swt.graphics.Image getImage()

Returns an image representing this input. This image is typically displayed when this input is shown in a viewer. In many cases this image is the image of one of the non-null sides.

getKind

public int getKind()

Returns the kind of difference between the three sides ancestor, left and right. This field is only meaningful if the ICompareInput is the result of another compare. In this case it is used together with getImage to compose a icon which reflects the kind of difference between the two or three elements.

getAncestor

public org.eclipse.compare.ITypedElement getAncestor()

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

getLeft

public org.eclipse.compare.ITypedElement getLeft()

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

getRight

public org.eclipse.compare.ITypedElement getRight()

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

addCompareInputChangeListener

public void addCompareInputChangeListener(ICompareInputChangeListener listener)

Registers the given listener for notification. If the identical listener is already registered the method has no effect.

removeCompareInputChangeListener

public void removeCompareInputChangeListener(ICompareInputChangeListener listener)

Unregisters the given listener. If the identical listener is not registered the method has no effect.

copy

public void copy(boolean leftToRight)

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.