StringToBooleanConverter


1   // Copyright 2004, 2005 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.tapestry.coerce;
16  
17  import org.apache.hivemind.HiveMind;
18  
19  /**
20   * Converts a String to a Boolean. Strings that do contain non-whitespace are considered true. As a
21   * special case, the string "false" evaluates to false (this allow boolean component parameters to
22   * be bound to "false" instead of "ognl:false" and still operate as expected).
23   * 
24   * @author Howard M. Lewis Ship
25   * @since 4.0
26   */
27  public class StringToBooleanConverter implements TypeConverter
28  {
29  
30      public Object   convertValue(Object   value)
31      {
32          String   s = (String  ) value;
33  
34          boolean b = HiveMind.isNonBlank(s) && !s.equals("false");
35  
36          // JDK 1.4 has a Boolean.valueOf(), but we're trying for 1.3 compatibility
37  
38          return b ? Boolean.TRUE : Boolean.FALSE;
39      }
40  
41  }

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