/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */
package net.sourceforge.phpdt.internal.corext.textmanipulation;

import java.util.Comparator;

/**
 * A special comparator to comapre <code>TextRange</code>s.
 */
/* package */class TextEditNodeComparator implements Comparator {
	public int compare(Object o1, Object o2) {
		TextEditNode node1 = (TextEditNode) o1;
		TextEditNode node2 = (TextEditNode) o2;
		TextRange pos1 = node1.getTextRange();
		TextRange pos2 = node2.getTextRange();

		int offset1 = pos1.fOffset;
		int offset2 = pos2.fOffset;
		if (offset1 < offset2)
			return -1;
		if (offset1 > offset2)
			return 1;

		// same offset
		int length1 = pos1.fLength;
		int length2 = pos2.fLength;

		// insertion points come before anything else at the same position.
		if (length1 == 0 && length2 != 0)
			return -1;
		if (length1 != 0 && length2 == 0)
			return 1;

		// Longer edits come before shorter edits
		if (length1 < length2)
			return 1;
		if (length1 > length2)
			return -1;

		if (node1.fEdit.index < node2.fEdit.index)
			return -1;
		return 1;
	}
}