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*
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*
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* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
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* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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* file and include the License file at packager/legal/LICENSE.txt.
*
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* file that accompanied this code.
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package com.sun.xml.bind.v2.runtime.unmarshaller;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;
import javax.xml.XMLConstants;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.UnmarshalException;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.ValidationEvent;
import javax.xml.bind.ValidationEventHandler;
import javax.xml.bind.ValidationEventLocator;
import javax.xml.bind.helpers.ValidationEventImpl;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import com.sun.istack.NotNull;
import com.sun.istack.Nullable;
import com.sun.istack.SAXParseException2;
import com.sun.xml.bind.IDResolver;
import com.sun.xml.bind.api.AccessorException;
import com.sun.xml.bind.api.ClassResolver;
import com.sun.xml.bind.unmarshaller.InfosetScanner;
import com.sun.xml.bind.v2.ClassFactory;
import com.sun.xml.bind.v2.WellKnownNamespace;
import com.sun.xml.bind.v2.runtime.AssociationMap;
import com.sun.xml.bind.v2.runtime.Coordinator;
import com.sun.xml.bind.v2.runtime.JAXBContextImpl;
import com.sun.xml.bind.v2.runtime.JaxBeanInfo;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.LocatorImpl;
/**
* Center of the unmarshalling.
*
*
* This object is responsible for coordinating {@link Loader}s to
* perform the whole unmarshalling.
*
* @author Kohsuke Kawaguchi
*/
public final class UnmarshallingContext extends Coordinator
implements NamespaceContext, ValidationEventHandler, ErrorHandler, XmlVisitor, XmlVisitor.TextPredictor {
/**
* Root state.
*/
private final State root;
/**
* The currently active state.
*/
private State current;
private static final LocatorEx DUMMY_INSTANCE;
static {
LocatorImpl loc = new LocatorImpl();
loc.setPublicId(null);
loc.setSystemId(null);
loc.setLineNumber(-1);
loc.setColumnNumber(-1);
DUMMY_INSTANCE = new LocatorExWrapper(loc);
}
private @NotNull LocatorEx locator = DUMMY_INSTANCE;
/** Root object that is being unmarshalled. */
private Object result;
/**
* If non-null, this unmarshaller will unmarshal {@code JAXBElement}
* regardless of the tag name, as opposed to deciding the root object by using
* the tag name.
*
* The property has a package-level access, because we cannot copy this value
* to {@link UnmarshallingContext} when it is created. The property
* on {@link Unmarshaller} could be changed after the handler is created.
*/
private JaxBeanInfo expectedType;
/**
* Handles ID/IDREF.
*/
private IDResolver idResolver;
/**
* This flag is set to true at the startDocument event
* and false at the endDocument event.
*
* Until the first document is unmarshalled, we don't
* want to return an object. So this variable is initialized
* to true.
*/
private boolean isUnmarshalInProgress = true;
private boolean aborted = false;
public final UnmarshallerImpl parent;
/**
* If the unmarshaller is doing associative unmarshalling,
* this field is initialized to non-null.
*/
private final AssociationMap assoc;
/**
* Indicates whether we are doing in-place unmarshalling
* or not.
*
*
* This flag is unused when {@link #assoc}==null.
* If it's non-null, then true indicates
* that we are doing in-place associative unmarshalling.
* If false, then we are doing associative unmarshalling
* without object reuse.
*/
private boolean isInplaceMode;
/**
* This object is consulted to get the element object for
* the current element event.
*
* This is used when we are building an association map.
*/
private InfosetScanner scanner;
private Object currentElement;
/**
* @see XmlVisitor#startDocument(LocatorEx, NamespaceContext)
*/
private NamespaceContext environmentNamespaceContext;
/**
* Used to discover additional classes when we hit unknown elements/types.
*/
public @Nullable ClassResolver classResolver;
/**
* User-supplied {@link ClassLoader} for converting name to {@link Class}.
* For backward compatibility, when null, use thread context classloader.
*/
public @Nullable ClassLoader classLoader;
/**
* State information for each element.
*/
public final class State {
/**
* Loader that owns this element.
*/
public Loader loader;
/**
* Once {@link #loader} is completed, this receiver
* receives the result.
*/
public Receiver receiver;
public Intercepter intercepter;
/**
* Object being unmarshalled by this {@link #loader}.
*/
public Object target;
/**
* Hack for making JAXBElement unmarshalling work.
*
*
* While the unmarshalling is in progress, the {@link #target} field stores the object being unmarshalled.
* This makes it convenient to keep track of the unmarshalling activity in context of XML infoset, but
* since there's only one {@link State} per element, this mechanism only works when there's one object
* per element, which breaks down when we have {@link JAXBElement}, since the presence of JAXBElement
* requires that we have two objects unmarshalled (a JAXBElement X and a value object Y bound to an XML type.)
*
*
* So to make room for storing both, this {@link #backup} field is used. When we create X instance
* in the above example, we set that to {@code state.prev.target} and displace its old value to
* {@code state.prev.backup} (where Y goes to {@code state.target}.) Upon the completion of the unmarshalling
* of Y, we revert this.
*
*
* While this attributes X incorrectly to its parent element, this preserves the parent/child
* relationship between unmarshalled objects and {@link State} parent/child relationship, and
* it thereby makes {@link Receiver} mechanism simpler.
*
*
* Yes, I know this is a hack, and no, I'm not proud of it.
*
* @see ElementBeanInfoImpl.IntercepterLoader#startElement(State, TagName)
* @see ElementBeanInfoImpl.IntercepterLoader#intercept(State, Object)
*/
public Object backup;
/**
* Number of {@link UnmarshallingContext#nsBind}s declared thus far.
* (The value of {@link UnmarshallingContext#nsLen} when this state is pushed.
*/
private int numNsDecl;
/**
* If this element has an element default value.
*
* This should be set by either a parent {@link Loader} when
* {@link Loader#childElement(State, TagName)} is called
* or by a child {@link Loader} when
* {@link Loader#startElement(State, TagName)} is called.
*/
public String elementDefaultValue;
/**
* {@link State} for the parent element
*
* {@link State} objects form a doubly linked list.
*/
public final State prev;
private State next;
public boolean nil = false;
/**
* Gets the context.
*/
public UnmarshallingContext getContext() {
return UnmarshallingContext.this;
}
private State(State prev) {
this.prev = prev;
if(prev!=null)
prev.next = this;
}
private void push() {
if(next==null)
allocateMoreStates();
State n = next;
n.numNsDecl = nsLen;
current = n;
}
private void pop() {
assert prev!=null;
loader = null;
nil = false;
receiver = null;
intercepter = null;
elementDefaultValue = null;
target = null;
current = prev;
}
}
/**
* Stub to the user-specified factory method.
*/
private static class Factory {
private final Object factorInstance;
private final Method method;
public Factory(Object factorInstance, Method method) {
this.factorInstance = factorInstance;
this.method = method;
}
public Object createInstance() throws SAXException {
try {
return method.invoke(factorInstance);
} catch (IllegalAccessException e) {
getInstance().handleError(e,false);
} catch (InvocationTargetException e) {
getInstance().handleError(e,false);
}
return null; // can never be executed
}
}
/**
* Creates a new unmarshaller.
*
* @param assoc
* Must be both non-null when the unmarshaller does the
* in-place unmarshalling. Otherwise must be both null.
*/
public UnmarshallingContext( UnmarshallerImpl _parent, AssociationMap assoc) {
this.parent = _parent;
this.assoc = assoc;
this.root = this.current = new State(null);
allocateMoreStates();
}
public void reset(InfosetScanner scanner,boolean isInplaceMode, JaxBeanInfo expectedType, IDResolver idResolver) {
this.scanner = scanner;
this.isInplaceMode = isInplaceMode;
this.expectedType = expectedType;
this.idResolver = idResolver;
}
public JAXBContextImpl getJAXBContext() {
return parent.context;
}
public State getCurrentState() {
return current;
}
/**
* On top of {@link JAXBContextImpl#selectRootLoader(State, TagName)},
* this method also consults {@link ClassResolver}.
*
* @throws SAXException
* if {@link ValidationEventHandler} reported a failure.
*/
public Loader selectRootLoader(State state, TagName tag) throws SAXException {
try {
Loader l = getJAXBContext().selectRootLoader(state, tag);
if(l!=null) return l;
if(classResolver!=null) {
Class clazz = classResolver.resolveElementName(tag.uri, tag.local);
if(clazz!=null) {
JAXBContextImpl enhanced = getJAXBContext().createAugmented(clazz);
JaxBeanInfo bi = enhanced.getBeanInfo(clazz);
return bi.getLoader(enhanced,true);
}
}
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
handleError(e);
}
return null;
}
/**
* Allocates a few more {@link State}s.
*
* Allocating multiple {@link State}s at once allows those objects
* to be allocated near each other, which reduces the working set
* of CPU. It improves the chance the relevant data is in the cache.
*/
private void allocateMoreStates() {
// this method should be used only when we run out of a state.
assert current.next==null;
State s = current;
for( int i=0; i<8; i++ )
s = new State(s);
}
/**
* User-specified factory methods.
*/
private final Map factories = new HashMap();
public void setFactories(Object factoryInstances) {
factories.clear();
if(factoryInstances==null) {
return;
}
if(factoryInstances instanceof Object[]) {
for( Object factory : (Object[])factoryInstances ) {
// look for all the public methods inlcuding derived ones
addFactory(factory);
}
} else {
addFactory(factoryInstances);
}
}
private void addFactory(Object factory) {
for( Method m : factory.getClass().getMethods() ) {
// look for methods whose signature is T createXXX()
if(!m.getName().startsWith("create"))
continue;
if(m.getParameterTypes().length>0)
continue;
Class type = m.getReturnType();
factories.put(type,new Factory(factory,m));
}
}
public void startDocument(LocatorEx locator, NamespaceContext nsContext) throws SAXException {
if(locator!=null)
this.locator = locator;
this.environmentNamespaceContext = nsContext;
// reset the object
result = null;
current = root;
patchersLen=0;
aborted = false;
isUnmarshalInProgress = true;
nsLen=0;
setThreadAffinity();
if(expectedType!=null)
root.loader = EXPECTED_TYPE_ROOT_LOADER;
else
root.loader = DEFAULT_ROOT_LOADER;
idResolver.startDocument(this);
}
public void startElement(TagName tagName) throws SAXException {
pushCoordinator();
try {
_startElement(tagName);
} finally {
popCoordinator();
}
}
private void _startElement(TagName tagName) throws SAXException {
// remember the current element if we are interested in it.
// because the inner peer might not be found while we consume
// the enter element token, we need to keep this information
// longer than this callback. That's why we assign it to a field.
if( assoc!=null )
currentElement = scanner.getCurrentElement();
Loader h = current.loader;
current.push();
// tell the parent about the new child
h.childElement(current,tagName);
assert current.loader!=null; // the childElement should register this
// and tell the new child that you are activated
current.loader.startElement(current,tagName);
}
public void text(CharSequence pcdata) throws SAXException {
State cur = current;
pushCoordinator();
try {
if(cur.elementDefaultValue!=null) {
if(pcdata.length()==0) {
// send the default value into the unmarshaller instead
pcdata = cur.elementDefaultValue;
}
}
cur.loader.text(cur,pcdata);
} finally {
popCoordinator();
}
}
public final void endElement(TagName tagName) throws SAXException {
pushCoordinator();
try {
State child = current;
// tell the child that your time is up
child.loader.leaveElement(child,tagName);
// child.pop will erase them so store them now
Object target = child.target;
Receiver recv = child.receiver;
Intercepter intercepter = child.intercepter;
child.pop();
// then let the parent know
if(intercepter!=null)
target = intercepter.intercept(current,target);
if(recv!=null)
recv.receive(current,target);
} finally {
popCoordinator();
}
}
public void endDocument() throws SAXException {
runPatchers();
idResolver.endDocument();
isUnmarshalInProgress = false;
currentElement = null;
locator = DUMMY_INSTANCE;
environmentNamespaceContext = null;
// at the successful completion, scope must be all closed
assert root==current;
resetThreadAffinity();
}
/**
* You should be always calling this through {@link TextPredictor}.
*/
@Deprecated
public boolean expectText() {
return current.loader.expectText;
}
/**
* You should be always getting {@link TextPredictor} from {@link XmlVisitor}.
*/
@Deprecated
public TextPredictor getPredictor() {
return this;
}
public UnmarshallingContext getContext() {
return this;
}
/**
* Gets the result of the unmarshalling
*/
public Object getResult() throws UnmarshalException {
if(isUnmarshalInProgress)
throw new IllegalStateException();
if(!aborted) return result;
// there was an error.
throw new UnmarshalException((String)null);
}
void clearResult() {
if (isUnmarshalInProgress) {
throw new IllegalStateException();
}
result = null;
}
/**
* Creates a new instance of the specified class.
* In the unmarshaller, we need to check the user-specified factory class.
*/
public Object createInstance( Class clazz ) throws SAXException {
if(!factories.isEmpty()) {
Factory factory = factories.get(clazz);
if(factory!=null)
return factory.createInstance();
}
return ClassFactory.create(clazz);
}
/**
* Creates a new instance of the specified class.
* In the unmarshaller, we need to check the user-specified factory class.
*/
public Object createInstance( JaxBeanInfo beanInfo ) throws SAXException {
if(!factories.isEmpty()) {
Factory factory = factories.get(beanInfo.jaxbType);
if(factory!=null)
return factory.createInstance();
}
try {
return beanInfo.createInstance(this);
} catch (IllegalAccessException e) {
Loader.reportError("Unable to create an instance of "+beanInfo.jaxbType.getName(),e,false);
} catch (InvocationTargetException e) {
Loader.reportError("Unable to create an instance of "+beanInfo.jaxbType.getName(),e,false);
} catch (InstantiationException e) {
Loader.reportError("Unable to create an instance of "+beanInfo.jaxbType.getName(),e,false);
}
return null; // can never be here
}
//
//
// error handling
//
//
/**
* Reports an error to the user, and asks if s/he wants
* to recover. If the canRecover flag is false, regardless
* of the client instruction, an exception will be thrown.
*
* Only if the flag is true and the user wants to recover from an error,
* the method returns normally.
*
* The thrown exception will be catched by the unmarshaller.
*/
public void handleEvent(ValidationEvent event, boolean canRecover ) throws SAXException {
ValidationEventHandler eventHandler = parent.getEventHandler();
boolean recover = eventHandler.handleEvent(event);
// if the handler says "abort", we will not return the object
// from the unmarshaller.getResult()
if(!recover) aborted = true;
if( !canRecover || !recover )
throw new SAXParseException2( event.getMessage(), locator,
new UnmarshalException(
event.getMessage(),
event.getLinkedException() ) );
}
public boolean handleEvent(ValidationEvent event) {
try {
// if the handler says "abort", we will not return the object.
boolean recover = parent.getEventHandler().handleEvent(event);
if(!recover) aborted = true;
return recover;
} catch( RuntimeException re ) {
// if client event handler causes a runtime exception, then we
// have to return false.
return false;
}
}
/**
* Reports an exception found during the unmarshalling to the user.
* This method is a convenience method that calls into
* {@link #handleEvent(ValidationEvent, boolean)}
*/
public void handleError(Exception e) throws SAXException {
handleError(e,true);
}
public void handleError(Exception e,boolean canRecover) throws SAXException {
handleEvent(new ValidationEventImpl(ValidationEvent.ERROR,e.getMessage(),locator.getLocation(),e),canRecover);
}
public void handleError(String msg) {
handleEvent(new ValidationEventImpl(ValidationEvent.ERROR,msg,locator.getLocation()));
}
protected ValidationEventLocator getLocation() {
return locator.getLocation();
}
/**
* Gets the current source location information in SAX {@link Locator}.
*
* Sometimes the unmarshaller works against a different kind of XML source,
* making this information meaningless.
*/
public LocatorEx getLocator() { return locator; }
/**
* Called when there's no corresponding ID value.
*/
public void errorUnresolvedIDREF(Object bean, String idref, LocatorEx loc) throws SAXException {
handleEvent( new ValidationEventImpl(
ValidationEvent.ERROR,
Messages.UNRESOLVED_IDREF.format(idref),
loc.getLocation()), true );
}
//
//
// ID/IDREF related code
//
//
/**
* Submitted patchers in the order they've submitted.
* Many XML vocabulary doesn't use ID/IDREF at all, so we
* initialize it with null.
*/
private Patcher[] patchers = null;
private int patchersLen = 0;
/**
* Adds a job that will be executed at the last of the unmarshalling.
* This method is used to support ID/IDREF feature, but it can be used
* for other purposes as well.
*
* @param job
* The run method of this object is called.
*/
public void addPatcher( Patcher job ) {
// re-allocate buffer if necessary
if( patchers==null )
patchers = new Patcher[32];
if( patchers.length == patchersLen ) {
Patcher[] buf = new Patcher[patchersLen*2];
System.arraycopy(patchers,0,buf,0,patchersLen);
patchers = buf;
}
patchers[patchersLen++] = job;
}
/** Executes all the patchers. */
private void runPatchers() throws SAXException {
if( patchers!=null ) {
for( int i=0; i
* The exception thrown from {@link Callable#call()} means the unmarshaller should abort
* right away.
*
* @see IDResolver#resolve(String, Class)
*/
public Callable getObjectFromId( String id, Class targetType ) throws SAXException {
return idResolver.resolve(id,targetType);
}
//
//
// namespace binding maintainance
//
//
private String[] nsBind = new String[16];
private int nsLen=0;
public void startPrefixMapping( String prefix, String uri ) {
if(nsBind.length==nsLen) {
// expand the buffer
String[] n = new String[nsLen*2];
System.arraycopy(nsBind,0,n,0,nsLen);
nsBind=n;
}
nsBind[nsLen++] = prefix;
nsBind[nsLen++] = uri;
}
public void endPrefixMapping( String prefix ) {
nsLen-=2;
}
private String resolveNamespacePrefix( String prefix ) {
if(prefix.equals("xml"))
return WellKnownNamespace.XML_NAMESPACE_URI;
for( int i=nsLen-2; i>=0; i-=2 ) {
if(prefix.equals(nsBind[i]))
return nsBind[i+1];
}
if(environmentNamespaceContext!=null)
// temporary workaround until Zephyr fixes 6337180
return environmentNamespaceContext.getNamespaceURI(prefix.intern());
// by default, the default ns is bound to "".
// but allow environmentNamespaceContext to take precedence
if(prefix.equals(""))
return "";
// unresolved. error.
return null;
}
/**
* Returns a list of prefixes newly declared on the current element.
*
* @return
* A possible zero-length array of prefixes. The default prefix
* is represented by the empty string.
*/
public String[] getNewlyDeclaredPrefixes() {
return getPrefixList( current.prev.numNsDecl );
}
/**
* Returns a list of all in-scope prefixes.
*
* @return
* A possible zero-length array of prefixes. The default prefix
* is represented by the empty string.
*/
public String[] getAllDeclaredPrefixes() {
return getPrefixList(0);
}
private String[] getPrefixList( int startIndex ) {
int size = (current.numNsDecl - startIndex)/2;
String[] r = new String[size];
for( int i=0; i getPrefixes(String uri) {
// TODO: could be implemented much faster
// wrap it into unmodifiable list so that the remove method
// will throw UnsupportedOperationException.
return Collections.unmodifiableList(
getAllPrefixesInList(uri)).iterator();
}
private List getAllPrefixesInList(String uri) {
List a = new ArrayList();
if( uri==null )
throw new IllegalArgumentException();
if( uri.equals(XMLConstants.XML_NS_URI) ) {
a.add(XMLConstants.XML_NS_PREFIX);
return a;
}
if( uri.equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI) ) {
a.add(XMLConstants.XMLNS_ATTRIBUTE);
return a;
}
for( int i=nsLen-2; i>=0; i-=2 )
if(uri.equals(nsBind[i+1]))
if( getNamespaceURI(nsBind[i]).equals(nsBind[i+1]) )
// make sure that this prefix is still effective.
a.add(nsBind[i]);
return a;
}
public String getPrefix(String uri) {
if( uri==null )
throw new IllegalArgumentException();
if( uri.equals(XMLConstants.XML_NS_URI) )
return XMLConstants.XML_NS_PREFIX;
if( uri.equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI) )
return XMLConstants.XMLNS_ATTRIBUTE;
for( int i=nsLen-2; i>=0; i-=2 )
if(uri.equals(nsBind[i+1]))
if( getNamespaceURI(nsBind[i]).equals(nsBind[i+1]) )
// make sure that this prefix is still effective.
return nsBind[i];
if(environmentNamespaceContext!=null)
return environmentNamespaceContext.getPrefix(uri);
return null;
}
public String getNamespaceURI(String prefix) {
if (prefix == null)
throw new IllegalArgumentException();
if (prefix.equals(XMLConstants.XMLNS_ATTRIBUTE))
return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
return resolveNamespacePrefix(prefix);
}
//
//
//
// scope management
//
//
//
private Scope[] scopes = new Scope[16];
/**
* Points to the top of the scope stack (=size-1).
*/
private int scopeTop=0;
{
for( int i=0; i
* This method allocates a specified number of fresh {@link Scope} objects.
* They can be accessed by the {@link #getScope} method until the corresponding
* {@link #endScope} method is invoked.
*
*
* A new scope will mask the currently active scope. Only one frame of {@link Scope}s
* can be accessed at any given time.
*
* @param frameSize
* The # of slots to be allocated.
*/
public void startScope(int frameSize) {
scopeTop += frameSize;
// reallocation
if(scopeTop>=scopes.length) {
Scope[] s = new Scope[Math.max(scopeTop+1,scopes.length*2)];
System.arraycopy(scopes,0,s,0,scopes.length);
for( int i=scopes.length; i
* If any packing in progress will be finalized by this method.
*
* @param frameSize
* The same size that gets passed to the {@link #startScope(int)}
* method.
*/
public void endScope(int frameSize) throws SAXException {
try {
for( ; frameSize>0; frameSize--, scopeTop-- )
scopes[scopeTop].finish();
} catch (AccessorException e) {
handleError(e);
// the error might have left scopes in inconsistent state,
// so replace them by fresh ones
for( ; frameSize>0; frameSize-- )
scopes[scopeTop--] = new Scope(this);
}
}
/**
* Gets the currently active {@link Scope}.
*
* @param offset
* a number between [0,frameSize)
*
* @return
* always a valid {@link Scope} object.
*/
public Scope getScope(int offset) {
return scopes[scopeTop-offset];
}
//
//
//
//
//
//
//
private static final Loader DEFAULT_ROOT_LOADER = new DefaultRootLoader();
private static final Loader EXPECTED_TYPE_ROOT_LOADER = new ExpectedTypeRootLoader();
/**
* Root loader that uses the tag name and possibly its @xsi:type
* to decide how to start unmarshalling.
*/
private static final class DefaultRootLoader extends Loader implements Receiver {
/**
* Receives the root element and determines how to start
* unmarshalling.
*/
@Override
public void childElement(UnmarshallingContext.State state, TagName ea) throws SAXException {
Loader loader = state.getContext().selectRootLoader(state,ea);
if(loader!=null) {
state.loader = loader;
state.receiver = this;
return;
}
// the registry doesn't know about this element.
// try its xsi:type
JaxBeanInfo beanInfo = XsiTypeLoader.parseXsiType(state, ea, null);
if(beanInfo==null) {
// we don't even know its xsi:type
reportUnexpectedChildElement(ea,false);
return;
}
state.loader = beanInfo.getLoader(null,false);
state.prev.backup = new JAXBElement