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/*******************************************************************************
* Copyright (c) 2000, 2006 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.team.internal.ccvs.ui;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* Collator to compare two CVS revisions
*/
public class VersionCollator {
public int compare(String revision1, String revision2) {
if (revision1 == null && revision2 == null) return 0;
if (revision1 == null) return -1;
if (revision2 == null) return 1;
int[] revision1Segments = getIntSegments(revision1);
int[] revision2Segments = getIntSegments(revision2);
for (int i = 0; i < revision1Segments.length && i < revision2Segments.length; i++) {
int i1 = revision1Segments[i];
int i2 = revision2Segments[i];
if (i1 != i2) {
return i1 > i2 ? 1 : -1;
}
}
if (revision1Segments.length != revision2Segments.length) {
return revision1Segments.length > revision2Segments.length ? 1 : -1;
}
return 0;
}
int[] getIntSegments(String string) {
int size = string.length();
if (size == 0) return new int[0];
StringBuffer buffer = new StringBuffer();
List list = new ArrayList();
for (int i = 0; i < size; i++) {
char ch = string.charAt(i);
if (ch == '.') {
list.add(Integer.valueOf(buffer.toString()));
buffer = new StringBuffer();
} else {
buffer.append(ch);
}
}
list.add(Integer.valueOf(buffer.toString()));
int[] result = new int[list.size()];
Iterator it = list.iterator();
for (int i = 0; i < result.length; i++) {
result[i] = ((Integer)it.next()).intValue();
}
return result;
}
}
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