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Package-level Javadoc
Support for compare and merge viewers which show the
content side-by-side.
Package Specification
The ContentMergeViewer is an abstract compare and merge viewer
with two side-by-side content areas and an optional content area for a
common ancestor (for three-way compare). Because the implementation makes
no assumptions about the content type it is a subclass responsibility to
deal with a specific type. Its subclass ImageMergeViewer in
package org.eclipse.compare.internal shows how to base a simple
mergeviewer for images on ContentMergeViewer.
A ContentMergeViewer accesses its model by means of a content
provider which must implement the IMergeViewerContentProvider interface.
The TextMergeViewer is the standard concrete subclass of
ContentMergeViewer for comparing and merging text content.
A text merge viewer uses the org.eclipse.compare.rangedifferencer.RangeDifferencer
to perform a textual, line-by-line comparison of two (or three) input documents.
For text lines that differ the TextMergeViewer uses an ITokenComparator
to find longest sequences of matching and non-matching tokens.
The TextMergeViewer's
default token compare works on characters separated by whitespace. If a
different strategy is needed (for example, Java tokens in a Java-aware
merge viewer), clients can create their own token comparators by implementing
the ITokenComparator interface.
The TextMergeViewer not only works on whole documents but on
subranges of documents too. In this case the viewer's input must be an
IDocumentRange instead of an IDocument.