BooleanConverter


1   /*
2    * ====================================================================
3    * This software is subject to the terms of the Common Public License
4    * Agreement, available at the following URL:
5    *   http://www.opensource.org/licenses/cpl.html .
6    * Copyright (C) 2003-2004 TONBELLER AG.
7    * All Rights Reserved.
8    * You must accept the terms of that agreement to use this software.
9    * ====================================================================
10   *
11   * 
12   */
13  package com.tonbeller.wcf.convert;
14  
15  import java.lang.reflect.InvocationTargetException  ;
16  import java.util.Map  ;
17  
18  import org.apache.commons.beanutils.PropertyUtils;
19  import org.w3c.dom.Element  ;
20  
21  import com.tonbeller.wcf.format.FormatException;
22  import com.tonbeller.wcf.format.Formatter;
23  import com.tonbeller.wcf.ui.Item;
24  import com.tonbeller.wcf.utils.DomUtils;
25  
26  /**
27   * @author av
28   * Converter for RadioButton and CheckBox.
29   */
30  
31  public abstract class BooleanConverter extends NodeConverterBase {
32    public static final int UNKNOWN = 1;
33    public static final int TRUE = 2;
34    public static final int FALSE = 3;
35  
36    /**
37     * sets the selected attribute of the DOM element. If a modelReference
38     * is specified, it must point to a boolean bean-property that will be updated.
39     *
40     * @param fmt Formatter for i18n string-object conversion
41     * @param params parameters of http request
42     * @param elem the target element.
43     * @param bean the target bean
44     */
45    public void convert(Formatter fmt, Map   params, Map   fileParams, Element   elem, Object   bean)
46      throws FormatException, IllegalAccessException  , NoSuchMethodException  , InvocationTargetException   {
47  
48      int state = isSelected(elem, params);
49      if (state == UNKNOWN)
50        return;
51  
52      // was the checkbox checked?
53      Boolean   value = new Boolean  (state == TRUE);
54  
55      // set into elem and bean
56      DomUtils.removeAttribute(elem, "error");
57      Item.setSelected(elem, value.booleanValue());
58  
59      // update bean
60      String   modelReference = Item.getModelReference(elem);
61      if (bean != null && modelReference.length() > 0)
62        PropertyUtils.setProperty(bean, Item.getModelReference(elem), value);
63    }
64  
65    /**
66     * evaluates the http paramters. Does not evaluate the selected attribute of the DOM Element.
67     * @return one of TRUE, FALSE, UNKNOWN
68     */
69    public abstract int isSelected(Element   elem, Map   params);
70  
71    /**
72     * sets the selected attribute of the checkbox from the bean
73     */
74    public void convert(Formatter fmt, Object   bean, Element   elem)
75      throws IllegalAccessException  , NoSuchMethodException  , InvocationTargetException   {
76  
77      String   modelReference = Item.getModelReference(elem);
78      if (bean == null || modelReference.length() == 0)
79        return;
80  
81      Boolean   value = (Boolean  ) PropertyUtils.getProperty(bean, Item.getModelReference(elem));
82      boolean b = (value == null) ? false : value.booleanValue();
83      Item.setSelected(elem, b);
84    }
85  
86  }
87
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