StringCompareToOperation.java

/*******************************************************************************
 * Copyright (c) 2011, 2014 Willink Transformations 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:
 *   E.D.Willink - Initial API and implementation
 *******************************************************************************/
package org.eclipse.ocl.pivot.library.string;

import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.eclipse.ocl.pivot.library.AbstractSimpleBinaryOperation;
import org.eclipse.ocl.pivot.utilities.ValueUtil;
import org.eclipse.ocl.pivot.values.IntegerValue;

/**
 * StringCompareToOperation realises the String::compareTo() library operation.
 */
public class StringCompareToOperation extends AbstractSimpleBinaryOperation
{
	public static final @NonNull StringCompareToOperation INSTANCE = new StringCompareToOperation();

	@Override
	public @NonNull IntegerValue evaluate(@Nullable Object left, @Nullable Object right) {
		String leftString = asString(left);
		String rightString = asString(right);
		return ValueUtil.integerValueOf(leftString.compareTo(rightString));
	}
}