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13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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15  * accompanied this code).
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25 
26 package com.sun.xml.internal.bind.v2.runtime.unmarshaller;
27 
28 import org.xml.sax.SAXException;
29 
30 /**
31  * Decorates another {@link Loader} by setting a default value.
32  *
33  * @author Kohsuke Kawaguchi
34  */
35 public final class DefaultValueLoaderDecorator extends Loader {
36     private final Loader l;
37     private final String defaultValue;
38 
DefaultValueLoaderDecorator(Loader l, String defaultValue)39     public DefaultValueLoaderDecorator(Loader l, String defaultValue) {
40         this.l = l;
41         this.defaultValue = defaultValue;
42     }
43 
44     @Override
startElement(UnmarshallingContext.State state, TagName ea)45     public void startElement(UnmarshallingContext.State state, TagName ea) throws SAXException {
46         // install the default value, but don't override the one given by the parent loader
47         if(state.getElementDefaultValue() == null)
48             state.setElementDefaultValue(defaultValue);
49 
50         state.setLoader(l);
51         l.startElement(state,ea);
52     }
53 }
54