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JAXB (JSR 222) Reference Implementation
/*
* Copyright (c) 1997, 2021 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package com.sun.xml.bind.v2.runtime.property;
import java.io.IOException;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.TreeMap;
import java.util.Collection;
import java.util.Collections;
import java.util.Arrays;
import java.util.Set;
import javax.xml.stream.XMLStreamException;
import javax.xml.namespace.QName;
import com.sun.xml.bind.api.AccessorException;
import com.sun.xml.bind.v2.ClassFactory;
import com.sun.xml.bind.v2.util.QNameMap;
import com.sun.xml.bind.v2.model.core.PropertyKind;
import com.sun.xml.bind.v2.model.runtime.RuntimeMapPropertyInfo;
import com.sun.xml.bind.v2.runtime.JAXBContextImpl;
import com.sun.xml.bind.v2.runtime.JaxBeanInfo;
import com.sun.xml.bind.v2.runtime.Name;
import com.sun.xml.bind.v2.runtime.XMLSerializer;
import com.sun.xml.bind.v2.runtime.reflect.Accessor;
import com.sun.xml.bind.v2.runtime.unmarshaller.ChildLoader;
import com.sun.xml.bind.v2.runtime.unmarshaller.TagName;
import com.sun.xml.bind.v2.runtime.unmarshaller.Loader;
import com.sun.xml.bind.v2.runtime.unmarshaller.Receiver;
import com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext;
import com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext.State;
import org.xml.sax.SAXException;
/**
* @author Kohsuke Kawaguchi
*/
final class SingleMapNodeProperty extends PropertyImpl {
private final Accessor acc;
/**
* The tag name that surrounds the whole property.
*/
private final Name tagName;
/**
* The tag name that corresponds to the 'entry' element.
*/
private final Name entryTag;
private final Name keyTag;
private final Name valueTag;
private final boolean nillable;
private JaxBeanInfo keyBeanInfo;
private JaxBeanInfo valueBeanInfo;
/**
* The implementation class for this property.
* If the property is null, we create an instance of this class.
*/
private final Class mapImplClass;
public SingleMapNodeProperty(JAXBContextImpl context, RuntimeMapPropertyInfo prop) {
super(context, prop);
acc = prop.getAccessor().optimize(context);
this.tagName = context.nameBuilder.createElementName(prop.getXmlName());
this.entryTag = context.nameBuilder.createElementName("","entry");
this.keyTag = context.nameBuilder.createElementName("","key");
this.valueTag = context.nameBuilder.createElementName("","value");
this.nillable = prop.isCollectionNillable();
this.keyBeanInfo = context.getOrCreate(prop.getKeyType());
this.valueBeanInfo = context.getOrCreate(prop.getValueType());
// infer the implementation class
//noinspection unchecked
Class sig = (Class) Utils.REFLECTION_NAVIGATOR.erasure(prop.getRawType());
mapImplClass = ClassFactory.inferImplClass(sig,knownImplClasses);
// TODO: error check for mapImplClass==null
// what is the error reporting path for this part of the code?
}
private static final Class[] knownImplClasses = {
HashMap.class, TreeMap.class, LinkedHashMap.class
};
public void reset(BeanT bean) throws AccessorException {
acc.set(bean,null);
}
/**
* A Map property can never be ID.
*/
public String getIdValue(BeanT bean) {
return null;
}
public PropertyKind getKind() {
return PropertyKind.MAP;
}
public void buildChildElementUnmarshallers(UnmarshallerChain chain, QNameMap handlers) {
keyLoader = keyBeanInfo.getLoader(chain.context,true);
valueLoader = valueBeanInfo.getLoader(chain.context,true);
handlers.put(tagName,new ChildLoader(itemsLoader,null));
}
private Loader keyLoader;
private Loader valueLoader;
/**
* Handles {@code } and {@code }.
*
* The target will be set to a {@link Map}.
*/
private final Loader itemsLoader = new Loader(false) {
private ThreadLocal> target = new ThreadLocal>();
private ThreadLocal> map = new ThreadLocal>();
@Override
public void startElement(UnmarshallingContext.State state, TagName ea) throws SAXException {
// create or obtain the Map object
try {
BeanT target = (BeanT) state.getPrev().getTarget();
ValueT mapValue = acc.get(target);
if(mapValue == null)
mapValue = ClassFactory.create(mapImplClass);
else
mapValue.clear();
Stack.push(this.target, target);
Stack.push(map, mapValue);
state.setTarget(mapValue);
} catch (AccessorException e) {
// recover from error by setting a dummy Map that receives and discards the values
handleGenericException(e,true);
state.setTarget(new HashMap());
}
}
@Override
public void leaveElement(State state, TagName ea) throws SAXException {
super.leaveElement(state, ea);
try {
acc.set(Stack.pop(target), Stack.pop(map));
} catch (AccessorException ex) {
handleGenericException(ex,true);
}
}
@Override
public void childElement(UnmarshallingContext.State state, TagName ea) throws SAXException {
if(ea.matches(entryTag)) {
state.setLoader(entryLoader);
} else {
super.childElement(state,ea);
}
}
@Override
public Collection getExpectedChildElements() {
return Collections.singleton(entryTag.toQName());
}
};
/**
* Handles {@code } and {@code }.
*
* The target will be set to a {@link Map}.
*/
private final Loader entryLoader = new Loader(false) {
@Override
public void startElement(UnmarshallingContext.State state, TagName ea) {
state.setTarget(new Object[2]); // this is inefficient
}
@Override
public void leaveElement(UnmarshallingContext.State state, TagName ea) {
Object[] keyValue = (Object[])state.getTarget();
Map map = (Map) state.getPrev().getTarget();
map.put(keyValue[0],keyValue[1]);
}
@Override
public void childElement(UnmarshallingContext.State state, TagName ea) throws SAXException {
if(ea.matches(keyTag)) {
state.setLoader(keyLoader);
state.setReceiver(keyReceiver);
return;
}
if(ea.matches(valueTag)) {
state.setLoader(valueLoader);
state.setReceiver(valueReceiver);
return;
}
super.childElement(state,ea);
}
@Override
public Collection getExpectedChildElements() {
return Arrays.asList(keyTag.toQName(),valueTag.toQName());
}
};
private static final class ReceiverImpl implements Receiver {
private final int index;
public ReceiverImpl(int index) {
this.index = index;
}
public void receive(UnmarshallingContext.State state, Object o) {
((Object[])state.getTarget())[index] = o;
}
}
private static final Receiver keyReceiver = new ReceiverImpl(0);
private static final Receiver valueReceiver = new ReceiverImpl(1);
@Override
public void serializeBody(BeanT o, XMLSerializer w, Object outerPeer) throws SAXException, AccessorException, IOException, XMLStreamException {
ValueT v = acc.get(o);
if(v!=null) {
bareStartTag(w,tagName,v);
for( Map.Entry e : (Set)v.entrySet() ) {
bareStartTag(w,entryTag,null);
Object key = e.getKey();
if(key!=null) {
w.startElement(keyTag,key);
w.childAsXsiType(key,fieldName,keyBeanInfo, false);
w.endElement();
}
Object value = e.getValue();
if(value!=null) {
w.startElement(valueTag,value);
w.childAsXsiType(value,fieldName,valueBeanInfo, false);
w.endElement();
}
w.endElement();
}
w.endElement();
} else
if(nillable) {
w.startElement(tagName,null);
w.writeXsiNilTrue();
w.endElement();
}
}
private void bareStartTag(XMLSerializer w, Name tagName, Object peer) throws IOException, XMLStreamException, SAXException {
w.startElement(tagName,peer);
w.endNamespaceDecls(peer);
w.endAttributes();
}
@Override
public Accessor getElementPropertyAccessor(String nsUri, String localName) {
if(tagName.equals(nsUri,localName))
return acc;
return null;
}
private static final class Stack {
private Stack parent;
private T value;
private Stack(Stack parent, T value) {
this.parent = parent;
this.value = value;
}
private Stack(T value) {
this.value = value;
}
private static void push(ThreadLocal> holder, T value) {
Stack parent = holder.get();
if (parent == null)
holder.set(new Stack(value));
else
holder.set(new Stack(parent, value));
}
private static T pop(ThreadLocal> holder) {
Stack current = holder.get();
if (current.parent == null)
holder.remove();
else
holder.set(current.parent);
return current.value;
}
}
}