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Eclipse Platform
Release 3.5

org.eclipse.compare.structuremergeviewer
Interface IStructureCreator

All Known Subinterfaces:
IStructureCreator2
All Known Implementing Classes:
StructureCreator, ZipFileStructureCreator

public interface IStructureCreator

Interface used to create a hierarchical structure of IStructureComparators for a given input object. In addition, it provides methods for locating a path in the hierarchical structure and to map a node of this structure back to the corresponding input object.

Structure creators are used in the following contexts:

  • the StructureDiffViewer uses an IStructureCreator to build two (or three) tree structures of its input elements (method getStructure). These trees are then compared with each other by means of the differencing engine and displayed with the DiffTreeViewer,
  • the ReplaceWithEditionDialog uses an IStructureCreator to map a path back to a range of characters in the textual representation.
A IStructureCreator provides methods for rewriting the tree produced by the differencing engine to support "smart" structural differencing. E.g. certain patterns of pairs of "addition" and "deletion" nodes can be detected as renames and merged into a single node.

Clients may implement this interface; there is no standard implementation.

See Also:
StructureDiffViewer, EditionSelectionDialog, Differencer

Method Summary
  String getContents ( Object node, boolean ignoreWhitespace)
          Returns the contents of the given node as a string for the purpose of performing a content comparison only (that is the string will not be visible in the UI).
  String getName ()
          Returns a descriptive name which can be used in the UI of the StructureDiffViewer.
  IStructureComparator getStructure ( Object input)
          Creates a tree structure consisting of IStructureComparators from the given object and returns its root object.
  IStructureComparator locate ( Object path, Object input)
          Creates the single node specified by path from the given input object.
 void save ( IStructureComparator node, Object input)
          Called whenever a copy operation has been performed on a tree node.
 

Method Detail

getName

String getName()
Returns a descriptive name which can be used in the UI of the StructureDiffViewer.

Returns:
a descriptive name for this IStructureCreator

getStructure

IStructureComparator getStructure(
Object input)
Creates a tree structure consisting of IStructureComparators from the given object and returns its root object. Implementing this method typically involves parsing the input object. In case of an error (e.g. a parsing error) the value null is returned.

Parameters:
input - the object from which to create the tree of IStructureComparator
Returns:
the root node of the structure or null in case of error

locate

IStructureComparator locate(
Object path,
                            
Object input)
Creates the single node specified by path from the given input object. In case of an error (e.g. a parsing error) the value null is returned. This method is similar to getStructure but in contrast to getStructure only a single node without any children must be returned. This method is used in the ReplaceWithEditionDialog to locate a sub element (e.g. a method) within an input object (e.g. a file containing source code).

One (not optimized) approach to implement this method is calling getStructure(input) to build the full tree, and then finding that node within the tree that is specified by path.

The syntax of path is not specified, because it is treated by the compare subsystem as an opaque entity and is not further interpreted. Clients using this functionality will pass a value of path to the selectEdition method of ReplaceWithEditionDialog and will receive this value unchanged as an argument to locate.

Parameters:
path - specifies a sub object within the input object
input - the object from which to create the IStructureComparator
Returns:
the single node specified by path or null

getContents

String getContents(
Object node,
                   boolean ignoreWhitespace)
Returns the contents of the given node as a string for the purpose of performing a content comparison only (that is the string will not be visible in the UI). If ignoreWhitespace is true all character sequences considered whitespace should be removed from the returned string.

Parameters:
node - the node for which to return a string representation
ignoreWhitespace - if true the returned string should not contain whitespace
Returns:
the string contents of the given node

save

void save(
IStructureComparator node,
          
Object input)
Called whenever a copy operation has been performed on a tree node.

Parameters:
node - the node for which to save the new content
input - the object from which the structure tree was created in getStructure

Eclipse Platform
Release 3.5

Guidelines for using Eclipse APIs.

Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.


 
 
  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire