com.sun.xml.bind.v2.runtime.unmarshaller.StructureLoader Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2019 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.unmarshaller;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import javax.xml.namespace.QName;
import com.sun.xml.bind.Utils;
import com.sun.xml.bind.api.AccessorException;
import com.sun.xml.bind.api.JAXBRIContext;
import com.sun.xml.bind.v2.WellKnownNamespace;
import com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl;
import com.sun.xml.bind.v2.runtime.JAXBContextImpl;
import com.sun.xml.bind.v2.runtime.JaxBeanInfo;
import com.sun.xml.bind.v2.runtime.property.AttributeProperty;
import com.sun.xml.bind.v2.runtime.property.Property;
import com.sun.xml.bind.v2.runtime.property.StructureLoaderBuilder;
import com.sun.xml.bind.v2.runtime.property.UnmarshallerChain;
import com.sun.xml.bind.v2.runtime.reflect.Accessor;
import com.sun.xml.bind.v2.runtime.reflect.TransducedAccessor;
import com.sun.xml.bind.v2.util.QNameMap;
import java.util.Iterator;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* Loads children of an element.
*
*
* This loader works with a single {@link JaxBeanInfo} and handles
* attributes, child elements, or child text.
*
* @author Kohsuke Kawaguchi
*/
public final class StructureLoader extends Loader {
/**
* This map statically stores information of the
* unmarshaller loader and can be used while unmarshalling
* Since creating new QNames is expensive use this optimized
* version of the map
*/
private final QNameMap childUnmarshallers = new QNameMap();
/**
* Loader that processes elements that didn't match anf of the {@link #childUnmarshallers}.
* Can be null.
*/
private /*final*/ ChildLoader catchAll;
/**
* If we have a loader for processing text. Otherwise null.
*/
private /*final*/ ChildLoader textHandler;
/**
* Unmarshallers for attribute values.
* May be null if no attribute is expected and {@link #attCatchAll}==null.
*/
private /*final*/ QNameMap attUnmarshallers;
/**
* This will receive all the attributes
* that were not processed. Never be null.
*/
private /*final*/ Accessor> attCatchAll;
private final JaxBeanInfo beanInfo;
/**
* The number of scopes this dispatcher needs to keep active.
*/
private /*final*/ int frameSize;
// this class is potentially useful for general audience, not just for ClassBeanInfoImpl,
// but since right now that is the only user, we make the construction code very specific
// to ClassBeanInfoImpl. See rev.1.5 of this file for the original general purpose definition.
public StructureLoader(ClassBeanInfoImpl beanInfo) {
super(true);
this.beanInfo = beanInfo;
}
/**
* Completes the initialization.
*
*
* To fix the cyclic reference issue, the main part of the initialization needs to be done
* after a {@link StructureLoader} is set to {@link ClassBeanInfoImpl#loader}.
*/
public void init( JAXBContextImpl context, ClassBeanInfoImpl beanInfo, Accessor> attWildcard) {
UnmarshallerChain chain = new UnmarshallerChain(context);
for (ClassBeanInfoImpl bi = beanInfo; bi != null; bi = bi.superClazz) {
for (int i = bi.properties.length - 1; i >= 0; i--) {
Property p = bi.properties[i];
switch(p.getKind()) {
case ATTRIBUTE:
if(attUnmarshallers==null)
attUnmarshallers = new QNameMap();
AttributeProperty ap = (AttributeProperty) p;
attUnmarshallers.put(ap.attName.toQName(),ap.xacc);
break;
case ELEMENT:
case REFERENCE:
case MAP:
case VALUE:
p.buildChildElementUnmarshallers(chain,childUnmarshallers);
break;
}
}
}
this.frameSize = chain.getScopeSize();
textHandler = childUnmarshallers.get(StructureLoaderBuilder.TEXT_HANDLER);
catchAll = childUnmarshallers.get(StructureLoaderBuilder.CATCH_ALL);
if(attWildcard!=null) {
attCatchAll = (Accessor>) attWildcard;
// we use attUnmarshallers==null as a sign to skip the attribute processing
// altogether, so if we have an att wildcard we need to have an empty qname map.
if(attUnmarshallers==null)
attUnmarshallers = EMPTY;
} else {
attCatchAll = null;
}
}
@Override
public void startElement(UnmarshallingContext.State state, TagName ea) throws SAXException {
UnmarshallingContext context = state.getContext();
// create the object to unmarshal
Object child;
assert !beanInfo.isImmutable();
// let's see if we can reuse the existing peer object
child = context.getInnerPeer();
if(child != null && beanInfo.jaxbType!=child.getClass())
child = null; // unexpected type.
if(child != null)
beanInfo.reset(child,context);
if(child == null)
child = context.createInstance(beanInfo);
context.recordInnerPeer(child);
state.setTarget(child);
fireBeforeUnmarshal(beanInfo, child, state);
context.startScope(frameSize);
if(attUnmarshallers!=null) {
Attributes atts = ea.atts;
for (int i = 0; i < atts.getLength(); i ++){
String auri = atts.getURI(i);
// may be empty string based on parser settings
String alocal = atts.getLocalName(i);
if ("".equals(alocal)) {
alocal = atts.getQName(i);
}
String avalue = atts.getValue(i);
TransducedAccessor xacc = attUnmarshallers.get(auri, alocal);
try {
if(xacc!=null) {
xacc.parse(child,avalue);
} else if (attCatchAll!=null) {
String qname = atts.getQName(i);
if(atts.getURI(i).equals(WellKnownNamespace.XML_SCHEMA_INSTANCE))
continue; // xsi:* attributes are meant to be processed by us, not by user apps.
Object o = state.getTarget();
Map map = attCatchAll.get(o);
if(map==null) {
// TODO: use ClassFactory.inferImplClass(sig,knownImplClasses)
// if null, create a new map.
if(attCatchAll.valueType.isAssignableFrom(HashMap.class))
map = new HashMap();
else {
// we don't know how to create a map for this.
// report an error and back out
context.handleError(Messages.UNABLE_TO_CREATE_MAP.format(attCatchAll.valueType));
return;
}
attCatchAll.set(o,map);
}
String prefix;
int idx = qname.indexOf(':');
if(idx<0) prefix="";
else prefix=qname.substring(0,idx);
map.put(new QName(auri,alocal,prefix),avalue);
}
} catch (AccessorException e) {
handleGenericException(e,true);
}
}
}
}
@Override
public void childElement(UnmarshallingContext.State state, TagName arg) throws SAXException {
ChildLoader child = childUnmarshallers.get(arg.uri,arg.local);
if(child == null) {
Boolean backupWithParentNamespace = ((JAXBContextImpl) state.getContext().getJAXBContext()).backupWithParentNamespace;
backupWithParentNamespace = backupWithParentNamespace != null
? backupWithParentNamespace
: Boolean.parseBoolean(Utils.getSystemProperty(JAXBRIContext.BACKUP_WITH_PARENT_NAMESPACE));
if ((beanInfo != null) && (beanInfo.getTypeNames() != null) && backupWithParentNamespace) {
Iterator typeNamesIt = beanInfo.getTypeNames().iterator();
QName parentQName = null;
if ((typeNamesIt != null) && (typeNamesIt.hasNext()) && (catchAll == null)) {
parentQName = (QName) typeNamesIt.next();
String parentUri = parentQName.getNamespaceURI();
child = childUnmarshallers.get(parentUri, arg.local);
}
}
if (child == null) {
child = catchAll;
if(child==null) {
super.childElement(state,arg);
return;
}
}
}
state.setLoader(child.loader);
state.setReceiver(child.receiver);
}
@Override
public Collection getExpectedChildElements() {
return childUnmarshallers.keySet();
}
@Override
public Collection getExpectedAttributes() {
return attUnmarshallers.keySet();
}
@Override
public void text(UnmarshallingContext.State state, CharSequence text) throws SAXException {
if(textHandler!=null)
textHandler.loader.text(state,text);
}
@Override
public void leaveElement(UnmarshallingContext.State state, TagName ea) throws SAXException {
state.getContext().endScope(frameSize);
fireAfterUnmarshal(beanInfo, state.getTarget(), state.getPrev());
}
private static final QNameMap EMPTY = new QNameMap();
public JaxBeanInfo getBeanInfo() {
return beanInfo;
}
}