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package com.sun.xml.bind.v2.runtime;
import java.util.HashMap;
import javax.xml.bind.ValidationEvent;
import javax.xml.bind.ValidationEventHandler;
import javax.xml.bind.ValidationEventLocator;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.bind.helpers.ValidationEventImpl;
import com.sun.xml.bind.v2.ClassFactory;
import com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* Object that coordinates the marshalling/unmarshalling.
*
* <p>
* This class takes care of the logic that allows code to obtain
* {@link UnmarshallingContext} and {@link XMLSerializer} instances
* during the unmarshalling/marshalling.
*
* <p>
* This is done by using a {@link ThreadLocal}. Therefore one unmarshalling/marshalling
* episode has to be done from the beginning till end by the same thread.
* (Note that the same {@link Coordinator} can be then used by a different thread
* for an entirely different episode.)
*
* This class also maintains the user-configured instances of {@link XmlAdapter}s.
*
* <p>
* This class implements {@link ErrorHandler} and propages erros to this object
* as the {@link ValidationEventHandler}, which will be implemented in a derived class.
*
* @author Kohsuke Kawaguchi
*/
public abstract class Coordinator implements ErrorHandler, ValidationEventHandler {
private final HashMap<Class<? extends XmlAdapter>,XmlAdapter> adapters =
new HashMap<Class<? extends XmlAdapter>,XmlAdapter>();
public final XmlAdapter putAdapter(Class<? extends XmlAdapter> c, XmlAdapter a) {
if(a==null)
return adapters.remove(c);
else
return adapters.put(c,a);
}
/**
* Gets the instance of the adapter.
*
* @return
* always non-null.
*/
public final <T extends XmlAdapter> T getAdapter(Class<T> key) {
T v = key.cast(adapters.get(key));
if(v==null) {
v = ClassFactory.create(key);
putAdapter(key,v);
}
return v;
}
public <T extends XmlAdapter> boolean containsAdapter(Class<T> type) {
return adapters.containsKey(type);
}
// this much is necessary to avoid calling get and set twice when we push.
private static final ThreadLocal<Coordinator> activeTable = new ThreadLocal<Coordinator>();
/**
* The {@link Coordinator} in charge before this {@link Coordinator}.
*/
private Coordinator old;
/**
* Called whenever an execution flow enters the realm of this {@link Coordinator}.
*/
protected final void pushCoordinator() {
old = activeTable.get();
activeTable.set(this);
}
/**
* Called whenever an execution flow exits the realm of this {@link Coordinator}.
*/
protected final void popCoordinator() {
if (old != null)
activeTable.set(old);
else
activeTable.remove();
old = null; // avoid memory leak
}
public static Coordinator _getInstance() {
return activeTable.get();
}
//
//
// ErrorHandler implementation
//
//
/**
* Gets the current location. Used for reporting the error source location.
*/
protected abstract ValidationEventLocator getLocation();
public final void error(SAXParseException exception) throws SAXException {
propagateEvent( ValidationEvent.ERROR, exception );
}
public final void warning(SAXParseException exception) throws SAXException {
propagateEvent( ValidationEvent.WARNING, exception );
}
public final void fatalError(SAXParseException exception) throws SAXException {
propagateEvent( ValidationEvent.FATAL_ERROR, exception );
}
private void propagateEvent( int severity, SAXParseException saxException )
throws SAXException {
ValidationEventImpl ve =
new ValidationEventImpl( severity, saxException.getMessage(), getLocation() );
Exception e = saxException.getException();
if( e != null ) {
ve.setLinkedException( e );
} else {
ve.setLinkedException( saxException );
}
// call the client's event handler. If it returns false, then bail-out
// and terminate the unmarshal operation.
boolean result = handleEvent( ve );
if( ! result ) {
// bail-out of the parse with a SAX exception, but convert it into
// an UnmarshalException back in in the AbstractUnmarshaller
throw saxException;
}
}
}