AbstractCollectionEditor


1   /**
2    *  Licensed to the Apache Software Foundation (ASF) under one or more
3    *  contributor license agreements.  See the NOTICE file distributed with
4    *  this work for additional information regarding copyright ownership.
5    *  The ASF licenses this file to You under the Apache License, Version 2.0
6    *  (the "License"); you may not use this file except in compliance with
7    *  the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   */
17  package org.apache.geronimo.common.propertyeditor;
18  
19  import java.beans.PropertyEditorSupport  ;
20  import java.util.Collection  ;
21  import java.util.StringTokenizer  ;
22  
23  /**
24   * An abstract collection editor.  Subclasses should provide the correct type of collection from
25   * the createCollection method and should override setValue to check the type of the value.
26   *
27   * @version $Rev: 476049 $ $Date: 2006-11-16 23:35:17 -0500 (Thu, 16 Nov 2006) $
28   */
29  public abstract class AbstractCollectionEditor extends PropertyEditorSupport   {
30  
31      /**
32       * Concrete subclasses should implement this method to create the correct type of collection.
33       *
34       * @return an empty instance of the type of collection  the subclass edits.
35       */
36      protected abstract Collection   createCollection();
37  
38      public void setAsText(String   text) {
39          if (text == null) {
40              setValue(null);
41          } else {
42              if (text.startsWith("[")) {
43                  text = text.substring(1);
44              }
45              if (text.endsWith("]")) {
46                  text = text.substring(0, text.length() - 1);
47              }
48              Collection   collection = createCollection();
49              StringTokenizer   stok = new StringTokenizer  (text, ",");
50  
51              while (stok.hasMoreTokens()) {
52                  collection.add(stok.nextToken().trim());
53              }
54  
55              setValue(collection);
56          }
57      }
58  }
59
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