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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 <tt>Differencer</tt> 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.
-<p>If the input elements to the differencing engine implement the <tt>IStructureComparator</tt>
-interface the engine recursively applies itself&nbsp; to the children of
-the input element. Leaf elements must implement the <tt>IStreamContentAccessor</tt>
-interface (see package <tt></tt>) so that the
-differencer can perform a bytewise comparison on them.
-<p>By default the differencing engine returns the result of the compare
-as a tree of <tt>DiffNode</tt> objects. Every <tt>DiffNode</tt> describes
-the changes among the two or three inputs.
-<p>A tree of <tt>DiffNodes</tt> can be displayed in a <tt>DiffTreeViewer</tt>.
-The <tt>DiffTreeViewer</tt> requires that inner nodes of the tree implement
-the <tt>IDiffContainer</tt> interface and leafs the <tt>IDiffElement</tt>
-<p>The typical steps to compare hierarchically structured data and to display
-the differences would be to:
-map the input data into a tree of <tt>IStructureComparator</tt> and <tt>IStreamContentAccessor</tt>s,</li>
-perform the compare operation by means of the <tt>Differencer</tt>, and</li>
-feed the differencing result into the <tt>DiffTreeViewer</tt>.</li>
-The <tt>StructureDiffViewer</tt> is a specialized <tt>DiffTreeViewer</tt>
-that automates the three steps from above. It takes a single input object
-of type <tt>ICompareInput</tt> from which it retrieves the two or three
-input elements to compare. Then it uses a <tt>IStructureCreator</tt> to
-extract a tree of <tt>IStructureComparator</tt> and <tt>IStreamContentAccessor</tt>
-from them. These trees are then compared with the differencing engine and
-the result is displayed in the tree viewer.

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