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Java > Open Source Codes > org > apache > hivemind > schema > rules > ReadContentRule


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.hivemind.schema.rules;
16
17 import org.apache.commons.logging.Log;
18 import org.apache.commons.logging.LogFactory;
19 import org.apache.hivemind.Element;
20 import org.apache.hivemind.ErrorHandler;
21 import org.apache.hivemind.schema.SchemaProcessor;
22 import org.apache.hivemind.schema.Translator;
23 import org.apache.hivemind.util.PropertyUtils;
24
25 /**
26  * Used to set a property of the top object on the stack to the value
27  * of the element's content. Created from the <code>&lt;read-content&gt;</code>
28  * element.
29  *
30  * <p>
31  * Note: an {@link org.apache.hivemind.Element}'s content is trimmed
32  * of leading and trailing whitespace as it is parsed and, additionally,
33  * will never be null (though it may be the empty string).
34  *
35  * @author Howard Lewis Ship
36  */
37 public class ReadContentRule extends BaseRule
38 {
39     private static final Log LOG = LogFactory.getLog(ReadContentRule.class);
40
41     private String JavaDoc _propertyName;
42
43     public void begin(SchemaProcessor processor, Element element)
44     {
45         String JavaDoc value = RuleUtils.processText(processor, element, element.getContent());
46
47         try
48         {
49             Translator t = processor.getContentTranslator();
50
51             Object JavaDoc target = processor.peek();
52
53             Class JavaDoc propertyType = PropertyUtils.getPropertyType(target, _propertyName);
54
55             Object JavaDoc finalValue =
56                 t.translate(
57                     processor.getContributingModule(),
58                     propertyType,
59                     value,
60                     element.getLocation());
61
62             PropertyUtils.write(target, _propertyName, finalValue);
63         }
64         catch (Exception JavaDoc ex)
65         {
66             ErrorHandler eh = processor.getContributingModule().getErrorHandler();
67
68             eh.error(
69                 LOG,
70                 RulesMessages.readContentFailure(processor, element, ex),
71                 element.getLocation(),
72                 ex);
73         }
74
75     }
76
77     public String JavaDoc getPropertyName()
78     {
79         return _propertyName;
80     }
81
82     public void setPropertyName(String JavaDoc string)
83     {
84         _propertyName = string;
85     }
86
87 }
88
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