1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
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8  * particular file as subject to the "Classpath" exception as provided
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11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
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19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24  */
25 
26 package com.sun.xml.internal.bind.v2.runtime.unmarshaller;
27 
28 import org.xml.sax.SAXException;
29 
30 /**
31  * {@link Loader} that delegates the processing to another {@link Loader}
32  * at {@link #startElement(UnmarshallingContext.State, TagName)}.
33  *
34  * @author Kohsuke Kawaguchi
35  */
36 public abstract class ProxyLoader extends Loader {
ProxyLoader()37     public ProxyLoader() {
38         super(false);
39     }
40 
41     @Override
startElement(UnmarshallingContext.State state, TagName ea)42     public final void startElement(UnmarshallingContext.State state, TagName ea) throws SAXException {
43         Loader loader = selectLoader(state,ea);
44         state.setLoader(loader);
45         loader.startElement(state,ea);
46     }
47 
48     /**
49      * Picks the loader to delegate to.
50      *
51      * @return never null.
52      */
selectLoader(UnmarshallingContext.State state, TagName ea)53     protected abstract Loader selectLoader(UnmarshallingContext.State state, TagName ea) throws SAXException;
54 
55     @Override
leaveElement(UnmarshallingContext.State state, TagName ea)56     public final void leaveElement(UnmarshallingContext.State state, TagName ea) {
57         // this loader is used just to forward to another loader,
58         // so we should never get this event.
59         throw new IllegalStateException();
60     }
61 }
62