001/**
002 * Copyright 2005-2012 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.kuali.ole;
017
018/**
019 * Kuali Rice ArcheType Help
020 * <p/>
021 * This is an example of a service implementation.
022 * <p/>
023 * An implementation of the ProductService that uses addition.
024 */
025public class AdditionProductServiceImpl implements ProductService {
026    @Override
027    public Integer product(Integer left, Integer right) {
028
029        if (left == null) {
030            throw new IllegalArgumentException("left is null");
031        }
032
033        if (right == null) {
034            throw new IllegalArgumentException("right is null");
035        }
036
037        final int absRight = Math.abs(right);
038
039        int sum = 0;
040        for (int i = 0; i < absRight; i++) {
041            sum += left;
042        }
043
044        return absRight != right.intValue() ? -sum : sum;
045    }
046}