DateCompareMethod


1   /*
2    * Copyright (C) 2005 Alfresco, Inc.
3    *
4    * Licensed under the Mozilla Public License version 1.1 
5    * with a permitted attribution clause. You may obtain a
6    * copy of the License at
7    *
8    *   http://www.alfresco.org/legal/license.txt
9    *
10   * Unless required by applicable law or agreed to in writing,
11   * software distributed under the License is distributed on an
12   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
13   * either express or implied. See the License for the specific
14   * language governing permissions and limitations under the
15   * License.
16   */
17  package org.alfresco.repo.template;
18  
19  import java.util.Date  ;
20  import java.util.List  ;
21  
22  import freemarker.ext.beans.BeanModel;
23  import freemarker.template.TemplateDateModel;
24  import freemarker.template.TemplateMethodModelEx;
25  import freemarker.template.TemplateModelException;
26  import freemarker.template.TemplateNumberModel;
27  
28  /**
29   * @author Kevin Roast
30   * 
31   * Custom FreeMarker Template language method.
32   * <p>
33   * Compare two dates to see if they differ by the specified number of miliseconds
34   * <p>
35   * Usage: 
36   *    dateCompare(dateA, dateB) - 1 if dateA if greater than dateB
37   *    dateCompare(dateA, dateB, millis) - 1 if dateA is greater than dateB by at least millis, else 0 
38   */
39  public final class DateCompareMethod implements TemplateMethodModelEx
40  {
41      /**
42       * @see freemarker.template.TemplateMethodModel#exec(java.util.List)
43       */
44      public Object   exec(List   args) throws TemplateModelException
45      {
46          int result = 0;
47          
48          if (args.size() >= 2)
49          {
50              Object   arg0 = args.get(0);
51              Object   arg1 = args.get(1);
52              long diff = 0;
53              if (args.size() == 3)
54              {
55                 Object   arg2 = args.get(2);
56                 if (arg2 instanceof TemplateNumberModel)
57                 {
58                    Number   number = ((TemplateNumberModel)arg2).getAsNumber();
59                    diff = number.longValue();
60                 }
61              }
62              if (arg0 instanceof TemplateDateModel && arg1 instanceof TemplateDateModel)
63              {
64                  Date   dateA = (Date  )((TemplateDateModel)arg0).getAsDate();
65                  Date   dateB = (Date  )((TemplateDateModel)arg1).getAsDate();
66                  if (dateA.getTime() > (dateB.getTime() - diff)) 
67                  {
68                     result = 1;
69                  }
70              }
71          }
72          
73          return result;
74      }
75  }
76
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