org.glassfish.hk2.xml.internal.XmlStreamImpl Maven / Gradle / Ivy
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package org.glassfish.hk2.xml.internal;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.Unmarshaller.Listener;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;
import org.glassfish.hk2.utilities.reflection.ClassReflectionHelper;
import org.glassfish.hk2.xml.jaxb.internal.BaseHK2JAXBBean;
import org.glassfish.hk2.xml.spi.Model;
/**
* @author jwells
*
*/
public class XmlStreamImpl {
@SuppressWarnings("unchecked")
public static T parseRoot(XmlServiceImpl xmlService,
Model rootModel,
XMLStreamReader reader,
Unmarshaller.Listener listener) throws Exception {
Class rootProxyClass = rootModel.getProxyAsClass();
ClassReflectionHelper classReflectionHelper = xmlService.getClassReflectionHelper();
BaseHK2JAXBBean hk2Root = Utilities.createBean(rootProxyClass);
hk2Root._setClassReflectionHelper(classReflectionHelper);
Map referenceMap = new HashMap();
List unresolved = new LinkedList();
while(reader.hasNext()) {
int event = reader.next();
switch(event) {
case XMLStreamConstants.START_ELEMENT:
handleElement(hk2Root, null, reader, classReflectionHelper, listener, referenceMap, unresolved);
break;
case XMLStreamConstants.END_DOCUMENT:
// Resolve any forward references
Utilities.fillInUnfinishedReferences(referenceMap, unresolved);
return (T) hk2Root;
default:
// Do nothing
}
}
throw new IllegalStateException("Unexpected end of XMLReaderStream");
}
private static void handleElement(BaseHK2JAXBBean target,
BaseHK2JAXBBean parent,
XMLStreamReader reader,
ClassReflectionHelper classReflectionHelper,
Listener listener,
Map referenceMap,
List unresolved) throws Exception {
listener.beforeUnmarshal(target, parent);
Map> listChildren = new HashMap>();
Map> arrayChildren = new HashMap>();
ModelImpl targetModel = target._getModel();
Map nonChildProperties = targetModel.getNonChildProperties();
Map childProperties = targetModel.getChildrenByName();
int numAttributes = reader.getAttributeCount();
for (int lcv = 0; lcv < numAttributes; lcv++) {
String attributeName = reader.getAttributeLocalName(lcv);
String attributeValue = reader.getAttributeValue(lcv);
ChildDataModel childDataModel = nonChildProperties.get(attributeName);
if (childDataModel == null) continue;
Class childType = targetModel.getNonChildType(attributeName);
if (!childDataModel.isReference()) {
Object convertedValue = Utilities.getDefaultValue(attributeValue, childType);
target._setProperty(attributeName, convertedValue);
}
else {
// Reference
ReferenceKey rk = new ReferenceKey(childDataModel.getChildType(), attributeValue);
BaseHK2JAXBBean reference = referenceMap.get(rk);
if (reference != null) {
target._setProperty(attributeName, reference);
}
else {
unresolved.add(new UnresolvedReference(childDataModel.getChildType(), attributeValue, attributeName, target));
}
}
}
while(reader.hasNext()) {
int event = reader.next();
switch(event) {
case XMLStreamConstants.START_ELEMENT:
String elementTag = reader.getName().getLocalPart();
ChildDataModel cdm = nonChildProperties.get(elementTag);
if (cdm != null) {
String elementValue = advanceNonChildElement(reader);
Class childType = cdm.getChildTypeAsClass();
if (!cdm.isReference()) {
Object convertedValue = Utilities.getDefaultValue(elementValue, childType);
target._setProperty(elementTag, convertedValue);
}
else {
ReferenceKey referenceKey = new ReferenceKey(cdm.getChildType(), elementValue);
BaseHK2JAXBBean reference = referenceMap.get(referenceKey);
if (reference != null) {
target._setProperty(elementTag, reference);
}
else {
unresolved.add(new UnresolvedReference(cdm.getChildType(),
elementValue, elementTag, target));
}
}
break;
}
ParentedModel informedChild = childProperties.get(elementTag);
if (informedChild != null) {
ModelImpl grandChild = informedChild.getChildModel();
BaseHK2JAXBBean hk2Root = Utilities.createBean(grandChild.getProxyAsClass());
hk2Root._setClassReflectionHelper(classReflectionHelper);
handleElement(hk2Root, target, reader, classReflectionHelper, listener, referenceMap, unresolved);
if (informedChild.getChildType().equals(ChildType.DIRECT)) {
target._setProperty(elementTag, hk2Root);
}
else if (informedChild.getChildType().equals(ChildType.LIST)) {
List cList = listChildren.get(elementTag);
if (cList == null) {
cList = new ArrayList();
listChildren.put(elementTag, cList);
}
cList.add(hk2Root);
}
else if (informedChild.getChildType().equals(ChildType.ARRAY)) {
List cList = arrayChildren.get(elementTag);
if (cList == null) {
cList = new LinkedList();
arrayChildren.put(elementTag, cList);
}
cList.add(hk2Root);
}
break;
}
break;
case XMLStreamConstants.CHARACTERS:
// Do nothing
break;
case XMLStreamConstants.END_ELEMENT:
for (Map.Entry> entry : listChildren.entrySet()) {
// Kind of cheating with the erasure, but hey, it works!
target._setProperty(entry.getKey(), entry.getValue());
}
for (Map.Entry> entry : arrayChildren.entrySet()) {
String childTag = entry.getKey();
ParentedModel pn = targetModel.getChild(childTag);
Class childType = pn.getChildModel().getOriginalInterfaceAsClass();
List individuals = entry.getValue();
Object actualArray = Array.newInstance(childType, individuals.size());
int index = 0;
for (BaseHK2JAXBBean individual : individuals) {
Array.set(actualArray, index++, individual);
}
target._setProperty(childTag, actualArray);
}
listener.afterUnmarshal(target, parent);
// Put the finished product into the reference map
String keyProp = target._getKeyPropertyName();
if (keyProp != null) {
String keyVal = (String) target._getProperty(keyProp);
String myType = target._getModel().getOriginalInterface();
if (keyVal != null && myType != null) {
referenceMap.put(new ReferenceKey(myType, keyVal), target);
}
}
return;
case XMLStreamConstants.COMMENT:
break;
default:
// Do nothing
}
}
}
private static String advanceNonChildElement(XMLStreamReader reader) throws Exception {
String retVal = null;
while (reader.hasNext()) {
int nextEvent = reader.next();
switch (nextEvent) {
case XMLStreamConstants.CHARACTERS:
String text = reader.getText();
// TODO: To trim or not to trim
retVal = text.trim();
break;
case XMLStreamConstants.END_ELEMENT:
return retVal;
default:
// Everything else would be comments or other stuff
// If not we have a bigger problem
}
}
return retVal;
}
}
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