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/*******************************************************************************
* Copyright (c) 2000, 2004 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.compare.rangedifferencer;
/**
* Description of a change between two or three ranges of comparable entities.
* <p>
* <code>RangeDifference</code> objects are the elements of a compare result returned from
* the <code>RangeDifferencer</code> <code>find* </code> methods.
* Clients use these objects as they are returned from the differencer.
* This class is not intended to be instantiated or subclassed.
* <p>
* Note: A range in the <code>RangeDifference</code> object is given as a start index
* and length in terms of comparable entities. However, these entity indices and counts
* are not necessarily character positions. For example, if an entity represents a line
* in a document, the start index would be a line number and the count would be in lines.
* </p>
*
* @see RangeDifferencer
*/
public class RangeDifference {
/** Two-way change constant indicating no change. */
public final static int NOCHANGE= 0;
/** Two-way change constant indicating two-way change (same as <code>RIGHT</code>) */
public final static int CHANGE= 2;
/** Three-way change constant indicating a change in both right and left. */
public final static int CONFLICT= 1;
/** Three-way change constant indicating a change in right. */
public final static int RIGHT= 2;
/** Three-way change constant indicating a change in left. */
public final static int LEFT= 3;
/**
* Three-way change constant indicating the same change in both right and left,
* that is only the ancestor is different.
*/
public final static int ANCESTOR= 4;
/** Constant indicating an unknown change kind. */
public final static int ERROR= 5;
/** the kind of change: NOCHANGE, CHANGE, LEFT, RIGHT, ANCESTOR, CONFLICT, ERROR */
int fKind;
int fLeftStart;
int fLeftLength;
int fRightStart;
int fRightLength;
int lAncestorStart;
int lAncestorLength;
/**
* Creates a new range difference with the given change kind.
*
* @param changeKind the kind of change
*/
/* package */ RangeDifference(int changeKind) {
fKind= changeKind;
}
/**
* Creates a new <code>RangeDifference</code> with the given change kind
* and left and right ranges.
*
* @param kind the kind of change
* @param rightStart start index of entity on right side
* @param rightLength number of entities on right side
* @param leftStart start index of entity on left side
* @param leftLength number of entities on left side
*/
/* package */ RangeDifference(int kind, int rightStart, int rightLength, int leftStart, int leftLength) {
fKind= kind;
fRightStart= rightStart;
fRightLength= rightLength;
fLeftStart= leftStart;
fLeftLength= leftLength;
}
/**
* Creates a new <code>RangeDifference</code> with the given change kind
* and left, right, and ancestor ranges.
*
* @param kind the kind of change
* @param rightStart start index of entity on right side
* @param rightLength number of entities on right side
* @param leftStart start index of entity on left side
* @param leftLength number of entities on left side
* @param ancestorStart start index of entity on ancestor side
* @param ancestorLength number of entities on ancestor side
*/
/* package */ RangeDifference(int kind, int rightStart, int rightLength, int leftStart, int leftLength,
int ancestorStart, int ancestorLength) {
this(kind, rightStart, rightLength, leftStart, leftLength);
lAncestorStart= ancestorStart;
lAncestorLength= ancestorLength;
}
/**
* Returns the kind of difference.
*
* @return the kind of difference, one of
* <code>NOCHANGE</code>, <code>CHANGE</code>, <code>LEFT</code>, <code>RIGHT</code>,
* <code>ANCESTOR</code>, <code>CONFLICT</code>, <code>ERROR</code>
*/
public int kind() {
return fKind;
}
/**
* Returns the start index of the entity range on the ancestor side.
*
* @return the start index of the entity range on the ancestor side
*/
public int ancestorStart() {
return lAncestorStart;
}
/**
* Returns the number of entities on the ancestor side.
*
* @return the number of entities on the ancestor side
*/
public int ancestorLength() {
return lAncestorLength;
}
/**
* Returns the end index of the entity range on the ancestor side.
*
* @return the end index of the entity range on the ancestor side
*/
public int ancestorEnd() {
return lAncestorStart + lAncestorLength;
}
/**
* Returns the start index of the entity range on the right side.
*
* @return the start index of the entity range on the right side
*/
public int rightStart() {
return fRightStart;
}
/**
* Returns the number of entities on the right side.
*
* @return the number of entities on the right side
*/
public int rightLength() {
return fRightLength;
}
/**
* Returns the end index of the entity range on the right side.
*
* @return the end index of the entity range on the right side
*/
public int rightEnd() {
return fRightStart + fRightLength;
}
/**
* Returns the start index of the entity range on the left side.
*
* @return the start index of the entity range on the left side
*/
public int leftStart() {
return fLeftStart;
}
/**
* Returns the number of entities on the left side.
*
* @return the number of entities on the left side
*/
public int leftLength() {
return fLeftLength;
}
/**
* Returns the end index of the entity range on the left side.
*
* @return the end index of the entity range on the left side
*/
public int leftEnd() {
return fLeftStart + fLeftLength;
}
/**
* Returns the maximum number of entities in the left, right, and ancestor sides of this range.
*
* @return the maximum number of entities in the left, right, and ancestor sides of this range
*/
public int maxLength() {
return Math.max(fRightLength, Math.max(fLeftLength, lAncestorLength));
}
}
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