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## org.eclipse.compare.structuremergeviewer
Interface ICompareInput

All Known Subinterfaces:
  ISynchronizeModelElement

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 `ICompareInputChangeListener`s 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 `ICompareInputChangeListener`s.

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

See Also:
  `StructureDiffViewer`, `ContentMergeViewer`, `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`.
`ITypedElement` | `getAncestor()` Returns the ancestor side of this input.
`Image` | `getImage()` Returns an image representing this input.
`int` | `getKind()` Returns the kind of difference between the three sides ancestor, left and right.
`ITypedElement` | `getLeft()` Returns the left side of this input.
`String` | `getName()` Returns name of input.
`ITypedElement` | `getRight()` Returns the right side of this input.
`void` | `removeCompareInputChangeListener(ICompareInputChangeListener listener)` Unregisters the given listener.

Method Detail

### getName

    public 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.

  Returns:
    name of input

### getImage

    public 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.

  Returns:
    image representing this input, or `null` if no icon should be shown

### 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.

  Returns:
    kind of difference (see `Differencer`)

### getAncestor

    public ITypedElement getAncestor()

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

  Returns:
    the ancestor of this input, or `null`

### getLeft

    public ITypedElement getLeft()

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

  Returns:
    the left side of this input, or `null`

### getRight

    public ITypedElement getRight()

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

  Returns:
    the right side of this input, or `null`

### addCompareInputChangeListener

    public void addCompareInputChangeListener(ICompareInputChangeListener listener)

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

  Parameters:
    `listener` - the listener to register for changes of this input

### removeCompareInputChangeListener

    public void removeCompareInputChangeListener(ICompareInputChangeListener listener)

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

  Parameters:
    `listener` - the listener to unregister

### 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`.

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

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