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1   /*
2    * Copyright 2006-2007 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.batch.sample.domain.order.internal.valang;
18  
19  import java.math.BigDecimal;
20  import java.util.List;
21  
22  import org.springframework.batch.sample.domain.order.LineItem;
23  import org.springmodules.validation.valang.functions.AbstractFunction;
24  import org.springmodules.validation.valang.functions.Function;
25  
26  
27  /**
28   * @author peter.zozom
29   *
30   */
31  public class ValidateDiscountsFunction extends AbstractFunction {
32      private static final BigDecimal BD_0 = new BigDecimal(0.0);
33      private static final BigDecimal BD_PERC_MAX = new BigDecimal(100.0);
34  
35      public ValidateDiscountsFunction(Function[] arguments, int line, int column) {
36          super(arguments, line, column);
37          definedExactNumberOfArguments(1);
38      }
39  
40      /**
41       * @see org.springmodules.validation.valang.functions.AbstractFunction#doGetResult(java.lang.Object)
42       */
43      @SuppressWarnings("unchecked")
44  	protected Object doGetResult(Object target) throws Exception {
45          List<LineItem> lineItems = (List<LineItem>) getArguments()[0].getResult(target);
46  
47          for (LineItem item : lineItems) {
48  
49              if (BD_0.compareTo(item.getDiscountPerc()) != 0) {
50                  //DiscountPerc must be between 0.0 and 100.0
51                  if ((BD_0.compareTo(item.getDiscountPerc()) > 0)
52                          || (BD_PERC_MAX.compareTo(item.getDiscountPerc()) < 0)
53                          || (BD_0.compareTo(item.getDiscountAmount()) != 0)) { //only one of DiscountAmount and DiscountPerc should be non-zero
54  
55                      return Boolean.FALSE;
56                  }
57              } else {
58                  //DiscountAmount must be between 0.0 and item.price
59                  if ((BD_0.compareTo(item.getDiscountAmount()) > 0)
60                          || (item.getPrice().compareTo(item.getDiscountAmount()) < 0)) {
61                      return Boolean.FALSE;
62                  }
63              }
64          }
65  
66          return Boolean.TRUE;
67      }
68  }