aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.xml.internal.bind.v2.runtime.unmarshaller;
aoqi@0: 
aoqi@0: import java.util.Collection;
aoqi@0: 
aoqi@0: import javax.xml.bind.JAXBElement;
aoqi@0: import javax.xml.namespace.QName;
aoqi@0: 
aoqi@0: import com.sun.xml.internal.bind.DatatypeConverterImpl;
aoqi@0: import com.sun.xml.internal.bind.api.AccessorException;
aoqi@0: import com.sun.xml.internal.bind.v2.WellKnownNamespace;
aoqi@0: import com.sun.xml.internal.bind.v2.runtime.reflect.Accessor;
aoqi@0: 
aoqi@0: import org.xml.sax.SAXException;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * Looks for xsi:nil='true' and sets the target to null.
aoqi@0:  * Otherwise delegate to another handler.
aoqi@0:  *
aoqi@0:  * @author Kohsuke Kawaguchi
aoqi@0:  */
aoqi@0: public class XsiNilLoader extends ProxyLoader {
aoqi@0: 
aoqi@0:     private final Loader defaultLoader;
aoqi@0: 
aoqi@0:     public XsiNilLoader(Loader defaultLoader) {
aoqi@0:         this.defaultLoader = defaultLoader;
aoqi@0:         assert defaultLoader!=null;
aoqi@0:     }
aoqi@0: 
aoqi@0:     protected Loader selectLoader(UnmarshallingContext.State state, TagName ea) throws SAXException {
aoqi@0:         int idx = ea.atts.getIndex(WellKnownNamespace.XML_SCHEMA_INSTANCE,"nil");
aoqi@0: 
aoqi@0:         if (idx!=-1) {
aoqi@0:             Boolean b = DatatypeConverterImpl._parseBoolean(ea.atts.getValue(idx));
aoqi@0: 
aoqi@0:             if (b != null && b) {
aoqi@0:                 onNil(state);
aoqi@0:                 boolean hasOtherAttributes = (ea.atts.getLength() - 1) > 0;
aoqi@0:                 // see issues 6759703 and 565 - need to preserve attributes even if the element is nil; only when the type is stored in JAXBElement
aoqi@0:                 if (!(hasOtherAttributes && (state.prev.target instanceof JAXBElement))) {
aoqi@0:                     return Discarder.INSTANCE;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return defaultLoader;
aoqi@0:     }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public Collection<QName> getExpectedChildElements() {
aoqi@0:             return defaultLoader.getExpectedChildElements();
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public Collection<QName> getExpectedAttributes() {
aoqi@0:             return defaultLoader.getExpectedAttributes();
aoqi@0:         }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Called when xsi:nil='true' was found.
aoqi@0:      */
aoqi@0:     protected void onNil(UnmarshallingContext.State state) throws SAXException {
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static final class Single extends XsiNilLoader {
aoqi@0:         private final Accessor acc;
aoqi@0:         public Single(Loader l, Accessor acc) {
aoqi@0:             super(l);
aoqi@0:             this.acc = acc;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         protected void onNil(UnmarshallingContext.State state) throws SAXException {
aoqi@0:             try {
aoqi@0:                 acc.set(state.prev.target,null);
aoqi@0:                 state.prev.nil = true;
aoqi@0:             } catch (AccessorException e) {
aoqi@0:                 handleGenericException(e,true);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static final class Array extends XsiNilLoader {
aoqi@0:         public Array(Loader core) {
aoqi@0:             super(core);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         protected void onNil(UnmarshallingContext.State state) {
aoqi@0:             // let the receiver add this to the lister
aoqi@0:             state.target = null;
aoqi@0:         }
aoqi@0:     }
aoqi@0: }