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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text;
/**
* Extension to {@link org.eclipse.jface.text.IDocumentInformationMapping}.
* <p>
* Extends the information available in the mapping by providing explicit access
* to the isomorphic portion of the basically homomorphic information mapping.
*
* @see org.eclipse.jface.text.IDocumentInformationMapping
* @since 3.0
*/
public interface IDocumentInformationMappingExtension {
/**
* Adheres to
* <code>originRegion=toOriginRegion(toExactImageRegion(originRegion))</code>,
* if <code>toExactImageRegion(originRegion) != null</code>. Returns
* <code>null</code> if there is no image for the given origin region.
*
* @param originRegion the origin region
* @return the exact image region or <code>null</code>
* @throws BadLocationException if origin region is not a valid region in
* the origin document
*/
IRegion toExactImageRegion(IRegion originRegion) throws BadLocationException;
/**
* Returns the segments of the image document that exactly correspond to the
* given region of the original document. Returns <code>null</code> if
* there are no such image regions.
*
* @param originRegion the region in the origin document
* @return the segments in the image document or <code>null</code>
* @throws BadLocationException in case the given origin region is not valid
* in the original document
*/
IRegion[] toExactImageRegions(IRegion originRegion) throws BadLocationException;
/**
* Returns the fragments of the original document that exactly correspond to
* the given region of the image document.
*
* @param imageRegion the region in the image document
* @return the fragments in the origin document
* @throws BadLocationException in case the given image region is not valid
* in the image document
*/
IRegion[] toExactOriginRegions(IRegion imageRegion) throws BadLocationException;
/**
* Returns the length of the image document.
*
* @return the length of the image document
*/
int getImageLength();
/**
* Returns the maximal sub-regions of the given origin region which are
* completely covered. I.e. each offset in a sub-region has a corresponding
* image offset. Returns <code>null</code> if there are no such
* sub-regions.
*
* @param originRegion the region in the origin document
* @return the sub-regions with complete coverage or <code>null</code>
* @throws BadLocationException in case the given origin region is not valid
* in the original document
*/
IRegion[] getExactCoverage(IRegion originRegion) throws BadLocationException;
}
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