# Package org.eclipse.jface.text.projection

This package provides an implementation of projection documents.

See: Description

Class Summary
ChildDocument: Implementation of a child document based on `ProjectionDocument`.
ChildDocumentManager: Implementation of a child document manager based on `ProjectionDocumentManager`.
Fragment: Internal class.
ProjectionDocument: A `ProjectionDocument` represents a projection of its master document.
ProjectionDocumentEvent: This event is sent out by an `ProjectionDocument`when it is manipulated.
ProjectionDocumentManager: A `ProjectionDocumentManager` is one particular implementation of `ISlaveDocumentManager`.
ProjectionMapping: Internal class.
Segment: Internal class.

## Package org.eclipse.jface.text.projection Description

This package provides an implementation of projection documents. Projection is a specific master/slave mapping. Non-overlapping fragments if a master document form the segments of a slave document. The slave document is completely built out of segments, i.e. there are no gaps between two neighboring segments. The segments have exactly the same sequence in which they apprear as fragments in the master document.

## Package Specification

`ProjectionDocument` is custom `IDocument` implementation that uses a `ProjectionTextStore.` The content of the `ProjectionDocument` is defined by the `ProjectionMapping.` The`ProjectionDocumentManager` manages the life cycle of `ProjectionDocuments` and their relation to their master documents.