1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 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 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.xml.internal.bind.v2.runtime.unmarshaller; 27 28 import java.util.Collection; 29 30 import javax.xml.bind.JAXBElement; 31 import javax.xml.namespace.QName; 32 33 import com.sun.xml.internal.bind.DatatypeConverterImpl; 34 import com.sun.xml.internal.bind.api.AccessorException; 35 import com.sun.xml.internal.bind.v2.WellKnownNamespace; 36 import com.sun.xml.internal.bind.v2.runtime.reflect.Accessor; 37 38 import org.xml.sax.SAXException; 39 40 /** 41 * Looks for xsi:nil='true' and sets the target to null. 42 * Otherwise delegate to another handler. 43 * 44 * @author Kohsuke Kawaguchi 45 */ 46 public class XsiNilLoader extends ProxyLoader { 47 48 private final Loader defaultLoader; 49 XsiNilLoader(Loader defaultLoader)50 public XsiNilLoader(Loader defaultLoader) { 51 this.defaultLoader = defaultLoader; 52 assert defaultLoader!=null; 53 } 54 selectLoader(UnmarshallingContext.State state, TagName ea)55 protected Loader selectLoader(UnmarshallingContext.State state, TagName ea) throws SAXException { 56 int idx = ea.atts.getIndex(WellKnownNamespace.XML_SCHEMA_INSTANCE,"nil"); 57 58 if (idx!=-1) { 59 Boolean b = DatatypeConverterImpl._parseBoolean(ea.atts.getValue(idx)); 60 61 if (b != null && b) { 62 onNil(state); 63 boolean hasOtherAttributes = (ea.atts.getLength() - 1) > 0; 64 // see issues 6759703 and 565 - need to preserve attributes even if the element is nil; only when the type is stored in JAXBElement 65 if (!(hasOtherAttributes && (state.getPrev().getTarget() instanceof JAXBElement))) { 66 return Discarder.INSTANCE; 67 } 68 } 69 } 70 return defaultLoader; 71 } 72 73 @Override getExpectedChildElements()74 public Collection<QName> getExpectedChildElements() { 75 return defaultLoader.getExpectedChildElements(); 76 } 77 78 @Override getExpectedAttributes()79 public Collection<QName> getExpectedAttributes() { 80 return defaultLoader.getExpectedAttributes(); 81 } 82 83 /** 84 * Called when xsi:nil='true' was found. 85 */ onNil(UnmarshallingContext.State state)86 protected void onNil(UnmarshallingContext.State state) throws SAXException { 87 } 88 89 public static final class Single extends XsiNilLoader { 90 private final Accessor acc; Single(Loader l, Accessor acc)91 public Single(Loader l, Accessor acc) { 92 super(l); 93 this.acc = acc; 94 } 95 96 @Override onNil(UnmarshallingContext.State state)97 protected void onNil(UnmarshallingContext.State state) throws SAXException { 98 try { 99 acc.set(state.getPrev().getTarget(),null); 100 state.getPrev().setNil(true); 101 } catch (AccessorException e) { 102 handleGenericException(e,true); 103 } 104 } 105 106 } 107 108 public static final class Array extends XsiNilLoader { Array(Loader core)109 public Array(Loader core) { 110 super(core); 111 } 112 113 @Override onNil(UnmarshallingContext.State state)114 protected void onNil(UnmarshallingContext.State state) { 115 // let the receiver add this to the lister 116 state.setTarget(null); 117 } 118 } 119 } 120