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/*******************************************************************************
* Copyright (c) 2000, 2008 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.projection;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.Position;
/**
* Implementation of a child document based on
* {@link org.eclipse.jface.text.projection.ProjectionDocument}. This class
* exists for compatibility reasons.
* <p>
* Internal class. This class is not intended to be used by clients.</p>
*
* @since 3.0
* @noinstantiate This class is not intended to be instantiated by clients.
* @noextend This class is not intended to be subclassed by clients.
*/
public class ChildDocument extends ProjectionDocument {
/**
* Position reflecting a visible region. The exclusive end offset of the position
* is considered being overlapping with the visible region.
*/
static private class VisibleRegion extends Position {
/**
* Creates a new visible region.
*
* @param regionOffset the offset of the region
* @param regionLength the length of the region
*/
public VisibleRegion(int regionOffset, int regionLength) {
super(regionOffset, regionLength);
}
/**
* If <code>regionOffset</code> is the end of the visible region and the <code>regionLength == 0</code>,
* the <code>regionOffset</code> is considered overlapping with the visible region.
*
* @see org.eclipse.jface.text.Position#overlapsWith(int, int)
*/
public boolean overlapsWith(int regionOffset, int regionLength) {
boolean appending= (regionOffset == offset + length) && regionLength == 0;
return appending || super.overlapsWith(regionOffset, regionLength);
}
}
/**
* Creates a new child document.
*
* @param masterDocument @inheritDoc
*/
public ChildDocument(IDocument masterDocument) {
super(masterDocument);
}
/**
* Returns the parent document of this child document.
*
* @return the parent document of this child document
* @see ProjectionDocument#getMasterDocument()
*/
public IDocument getParentDocument() {
return getMasterDocument();
}
/**
* Sets the parent document range covered by this child document to the
* given range.
*
* @param offset the offset of the range
* @param length the length of the range
* @throws BadLocationException if the given range is not valid
*/
public void setParentDocumentRange(int offset, int length) throws BadLocationException {
replaceMasterDocumentRanges(offset, length);
}
/**
* Returns the parent document range of this child document.
*
* @return the parent document range of this child document
*/
public Position getParentDocumentRange() {
IRegion coverage= getDocumentInformationMapping().getCoverage();
return new VisibleRegion(coverage.getOffset(), coverage.getLength());
}
}
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