Copyright (c) 2000, 2015 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2000, 2015 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.launching;


import java.util.Comparator;
import java.util.List;

Compares lists of runtime classpath entry mementos.
/**
 * Compares lists of runtime classpath entry mementos.
 */
public class RuntimeClasspathEntryListComparator implements Comparator<Object> {

	
See Also:
compare.compare(Object, Object)/**
	 * @see Comparator#compare(Object, Object)
	 */
	@Override
	public int compare(Object o1, Object o2) {
		List<?> list1 = (List<?>)o1;
		List<?> list2 = (List<?>)o2;

		if (list1.size() == list2.size()) {
			for (int i = 0; i < list1.size(); i++) {
				String memento1 = (String)list1.get(i);
				String memento2 = (String)list2.get(i);
				if (!equalsIgnoreWhitespace(memento1, memento2)) {
					return -1;
				}
			}
			return 0;
		}
		return -1;
	}

	protected boolean equalsIgnoreWhitespace(String one, String two) {
		int i1 = 0;
		int i2 = 0;
		int l1 = one.length();
		int l2 = two.length();
		char ch1 = ' ';
		char ch2 = ' ';
		while (i1 < l1 && i2 < l2) {
			while (i1 < l1 && Character.isWhitespace(ch1 = one.charAt(i1))) {
				i1++;
			}
			while (i2 < l2 && Character.isWhitespace(ch2 = two.charAt(i2))) {
				i2++;
			}
			if (i1 == l1 && i2 == l2) {
				return true;
			}
			if (ch1 != ch2) {
				return false;
			}
			i1++;
			i2++;
		}
		return true;
	}

}