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Java > Open Source Codes > org > riotfamily > common > beans > config > PlaceholderWithDefaultConfigurer


1 /* ***** BEGIN LICENSE BLOCK *****
2  * Version: MPL 1.1
3  * The contents of this file are subject to the Mozilla Public License Version
4  * 1.1 (the "License"); you may not use this file except in compliance with
5  * the License. You may obtain a copy of the License at
6  * http://www.mozilla.org/MPL/
7  *
8  * Software distributed under the License is distributed on an "AS IS" basis,
9  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
10  * for the specific language governing rights and limitations under the
11  * License.
12  *
13  * The Original Code is Riot.
14  *
15  * The Initial Developer of the Original Code is
16  * Neteye GmbH.
17  * Portions created by the Initial Developer are Copyright (C) 2006
18  * the Initial Developer. All Rights Reserved.
19  *
20  * Contributor(s):
21  * Felix Gnass [fgnass at neteye dot de]
22  *
23  * ***** END LICENSE BLOCK ***** */
24 package org.riotfamily.common.beans.config;
25
26 import java.util.Properties JavaDoc;
27
28 /**
29  * PropertyPlaceholderConfigurer that allows to define inline default values.
30  * <p>
31  * Example:
32  * <pre>
33  * &lt;bean class="org.riotfamily.example.HelloWorld"&gt;
34  * &lt;property name="message" value="${hello.message=Hello World}" /&gt;
35  * &lt;/bean&gt;
36  * </pre>
37  */
38 public class PlaceholderWithDefaultConfigurer
39         extends PropertiesPlaceholderConfigurer {
40
41     public static final String JavaDoc DEFAULT_VALUE_SEPARATOR = "=";
42     
43     private String JavaDoc valueSeparator = DEFAULT_VALUE_SEPARATOR;
44     
45     public void setValueSeparator(String JavaDoc valueSeparator) {
46         this.valueSeparator = valueSeparator;
47     }
48
49     protected String JavaDoc resolvePlaceholder(String JavaDoc placeholder, Properties JavaDoc props,
50             int systemPropertiesMode) {
51         
52         String JavaDoc defaultValue = null;
53         int i = placeholder.indexOf(valueSeparator);
54         if (i != -1) {
55             if (i + 1 < placeholder.length()) {
56                 defaultValue = placeholder.substring(i + 1);
57             }
58             placeholder = placeholder.substring(0, i);
59         }
60         String JavaDoc value = super.resolvePlaceholder(placeholder, props,
61                 systemPropertiesMode);
62         
63         if (value == null) {
64             value = defaultValue;
65         }
66         
67         return value;
68     }
69
70 }
71
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