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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text.reconciler;
import org.eclipse.jface.text.ITypedRegion;
/**
* A dirty region describes a document range which has been changed.
*/
public class DirtyRegion implements ITypedRegion {
/**
* Identifies an insert operation.
*/
final static public String INSERT= "__insert"; //$NON-NLS-1$
/**
* Identifies a remove operation.
*/
final static public String REMOVE= "__remove"; //$NON-NLS-1$
/** The region's offset */
private int fOffset;
/** The region's length */
private int fLength;
/** Indicates the type of the applied change */
private String fType;
/** The text which has been inserted */
private String fText;
/**
* Creates a new dirty region.
*
*
* @param offset the offset within the document where the change occurred
* @param length the length of the text within the document that changed
* @param type the type of change that this region represents: <code>INSERT</code> or <code>REMOVE</code>
* @param text the substitution text
*/
public DirtyRegion(int offset, int length, String type, String text) {
fOffset= offset;
fLength= length;
fType= type;
fText= text;
}
/*
* @see ITypedRegion#getOffset()
*/
public int getOffset() {
return fOffset;
}
/*
* @see ITypedRegion#getLength()
*/
public int getLength() {
return fLength;
}
/*
* @see ITypedRegion#getType
*/
public String getType() {
return fType;
}
/**
* Returns the text that changed as part of the region change.
*
* @return the changed text
*/
public String getText() {
return fText;
}
/**
* Modify the receiver so that it encompasses the region specified by the dirty region.
*
* @param dr the dirty region with which to merge
*/
void mergeWith(DirtyRegion dr) {
int start= Math.min(fOffset, dr.fOffset);
int end= Math.max(fOffset + fLength, dr.fOffset + dr.fLength);
fOffset= start;
fLength= end - start;
fText= (dr.fText == null ? fText : (fText == null) ? dr.fText : fText + dr.fText);
}
}
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