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Eclipse Platform
Release 3.0

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org.eclipse.compare
Class ZipFileStructureCreator

java.lang.Object
  org.eclipse.compare.ZipFileStructureCreator

All Implemented Interfaces:

IStructureCreator

public class ZipFileStructureCreator

extends Object

implements IStructureCreator

This implementation of the IStructureCreator interface makes the contents of a zip archive available as a hierarchical structure of IStructureComparators.

It is used when comparing the internal structure of a zip archive.

Since:

2.0

Constructor Summary

ZipFileStructureCreator()
Create a new ZipFileStructureCreator.

ZipFileStructureCreator(String title)
Create a new ZipFileStructureCreator with the given title.

Method Summary

boolean	canRewriteTree() Returns false since this IStructureCreator cannot rewrite the diff tree in order to fold certain combinations of additons and deletions.
boolean	canSave() Returns false since we cannot update a zip archive.
String	getContents(Object o, 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 source) Creates the single node specified by path from the given input object.
void	rewriteTree(Differencer diff, IDiffContainer root) Empty implementation since this IStructureCreator cannot rewrite the diff tree in order to fold certain combinations of additons and deletions.
void	save(IStructureComparator structure, Object input) Called whenever a copy operation has been performed on a tree node.

Methods inherited from class java.lang.Object

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

Constructor Detail

ZipFileStructureCreator

public ZipFileStructureCreator()

Create a new ZipFileStructureCreator.

ZipFileStructureCreator

public ZipFileStructureCreator(String title)

Create a new ZipFileStructureCreator with the given title. The title is returned by the method getName().

Parameters:

title - the title of this strcuture creator

Method Detail

getName

public String getName()

Description copied from interface: IStructureCreator

Returns a descriptive name which can be used in the UI of the StructureDiffViewer.

Specified by:

getName in interface IStructureCreator

Returns:

a descriptive name for this IStructureCreator

getStructure

public IStructureComparator getStructure(Object input)

Description copied from interface: IStructureCreator

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.

Specified by:

getStructure in interface IStructureCreator

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

getContents

public String getContents(Object o,
                          boolean ignoreWhitespace)

Description copied from interface: IStructureCreator

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.

Specified by:

getContents in interface IStructureCreator

Parameters:

o - 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

canSave

public boolean canSave()

Returns false since we cannot update a zip archive.

Returns:

false

save

public void save(IStructureComparator structure,
                 Object input)

Called whenever a copy operation has been performed on a tree node. This implementation throws an AssertionFailedException since we cannot update a zip archive.

Specified by:

save in interface IStructureCreator

Parameters:

structure - the node for which to save the new content

input - the object from which the structure tree was created in getStructure

locate

public IStructureComparator locate(Object path,
                                   Object source)

Description copied from interface: IStructureCreator

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.

Specified by:

locate in interface IStructureCreator

Parameters:

path - specifies a sub object within the input object

source - the object from which to create the IStructureComparator

Returns:

the single node specified by path or null

See Also:

EditionSelectionDialog.selectEdition(org.eclipse.compare.ITypedElement, org.eclipse.compare.ITypedElement[], java.lang.Object)

canRewriteTree

public boolean canRewriteTree()

Returns false since this IStructureCreator cannot rewrite the diff tree in order to fold certain combinations of additons and deletions.

Note: this method is for internal use only. Clients should not call this method.

Returns:

false

rewriteTree

public void rewriteTree(Differencer diff,
                        IDiffContainer root)

Empty implementation since this IStructureCreator cannot rewrite the diff tree in order to fold certain combinations of additons and deletions.

Note: this method is for internal use only. Clients should not call this method.