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-<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
- <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
- <meta name="Author" content="IBM">
- <meta name="GENERATOR" content="Mozilla/4.75 [en] (WinNT; U) [Netscape]">
- <title>Package-level Javadoc</title>
-Provides support for finding and displaying the differences
-between hierarchically structured data.
-Package Specification</h2>
-The class <b>Differencer</b> is a differencing engine for hierarchically
-structured data. It takes two or three inputs and performs a two-way or
-three-way compare on them.
-If the input elements to the differencing engine implement the <b>IStructureComparator</b>
-interface the engine recursively applies itself to the children of
-the input element. Leaf elements must implement the <b></b>
-interface so that the differencer can perform a bytewise comparison on their contents.
-One good example for this is <b></b> which implements both interfaces
-(and more) for Eclipse workspace resources (org.eclipse.core.resources.IResource).
-Another example is the <b>DocumentRangeNode</b> which can be used to compare hierarchical structures
-that are superimposed on a document, that is where nodes and leafs correspond to ranges in a document
-Typically <b>DocumentRangeNode</b>s are created while parsing a document and they represent
-the semantic entities of the document (e.g. a Java class, method or field).
-The two subclasses <b>JavaNode</b> (in
-and <b>PropertyNode</b> (in are good examples for this.
-By default the differencing engine returns the result of the compare operation
-as a tree of <b>DiffNode</b> objects. However, this can be changed by overriding
-a single method of the engine.
-Every <b>DiffNode</b> describes the changes among the two or three inputs.
-A tree of <b>DiffNodes</b> can be displayed in a <b>DiffTreeViewer</b>.
-The <b>DiffTreeViewer</b> requires that inner nodes of the tree implement
-the <b>IDiffContainer</b> interface and leafs the <b>IDiffElement</b> interface.
-The typical steps to compare hierarchically structured data and to display
-the differences would be to:
-map the input data into a tree of <b>IStructureComparator</b> and <b>IStreamContentAccessor</b>s,</li>
-perform the compare operation by means of the <b>Differencer</b>, and</li>
-feed the differencing result into the <b>DiffTreeViewer</b>.</li>
-The <b>StructureDiffViewer</b> is a specialized <b>DiffTreeViewer</b>
-that automates the three steps from above. It takes a single input object
-of type <b>ICompareInput</b> from which it retrieves the two or three
-input elements to compare. Then it uses a <b>IStructureCreator</b> to
-extract a tree of <b>IStructureComparator</b> and <b>IStreamContentAccessor</b>
-from them. These trees are then compared with the differencing engine and
-the result is displayed in the tree viewer.

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