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package org.apache.tuscany.sca.core.databinding.wire;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;
import javax.xml.namespace.QName;
import org.apache.tuscany.sca.databinding.Mediator;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.impl.DataTypeImpl;
import org.apache.tuscany.sca.interfacedef.util.FaultException;
import org.apache.tuscany.sca.interfacedef.util.XMLType;
import org.apache.tuscany.sca.runtime.RuntimeWire;
import org.osoa.sca.ServiceRuntimeException;
public class FaultTransformHelper {
private Mediator mediator;
public FaultTransformHelper(Mediator mediator) {
this.mediator = mediator;
}
public Object transformFault(Object result, Operation sourceOperation, Operation targetOperation, RuntimeWire wire) {
// FIXME: How to match fault data to a fault type for the
// operation?
// If the result is from an InvocationTargetException look at
// the actual cause.
if (result instanceof InvocationTargetException) {
result = ((InvocationTargetException)result).getCause();
}
DataType targetDataType = null;
for (DataType exType : targetOperation.getFaultTypes()) {
if (((Class)exType.getPhysical()).isInstance(result)) {
if (result instanceof FaultException) {
DataType faultType = (DataType)exType.getLogical();
if (((FaultException)result).isMatchingType(faultType.getLogical())) {
targetDataType = exType;
break;
}
} else {
targetDataType = exType;
break;
}
}
}
/*
if (targetDataType == null) {
// Not a business exception
return resultMsg;
}
*/
DataType targetFaultType = getFaultType(targetDataType);
if (targetFaultType == null) {
// No matching fault type, it's a system exception
Throwable cause = (Throwable) result;
throw new ServiceRuntimeException(cause);
}
// FIXME: How to match a source fault type to a target fault
// type?
DataType sourceDataType = null;
DataType sourceFaultType = null;
for (DataType exType : sourceOperation.getFaultTypes()) {
DataType faultType = getFaultType(exType);
// Match by the QName (XSD element) of the fault type
if (faultType != null && typesMatch(targetFaultType.getLogical(), faultType.getLogical())) {
sourceDataType = exType;
sourceFaultType = faultType;
break;
}
}
if (sourceFaultType == null) {
// No matching fault type, it's a system exception
Throwable cause = (Throwable) result;
throw new ServiceRuntimeException(cause);
}
Map<String, Object> metadata = new HashMap<String, Object>();
metadata.put("source.operation", targetOperation);
metadata.put("target.operation", sourceOperation);
// When is the 'wire' used?
if (wire != null) {
metadata.put("wire", wire);
}
Object newResult =
transformException(result, targetDataType, sourceDataType, targetFaultType, sourceFaultType, metadata);
return newResult;
}
/**
* @param source The source exception
* @param sourceExType The data type for the source exception
* @param targetExType The data type for the target exception
* @param sourceType The fault type for the source
* @param targetType The fault type for the target
* @return
*/
private Object transformException(Object source,
DataType sourceExType,
DataType targetExType,
DataType sourceType,
DataType targetType,
Map<String, Object> metadata) {
if (sourceType == targetType || (sourceType != null && sourceType.equals(targetType))) {
return source;
}
DataType<DataType> eSourceDataType =
new DataTypeImpl<DataType>("idl:fault", sourceExType.getPhysical(), sourceType);
DataType<DataType> eTargetDataType =
new DataTypeImpl<DataType>("idl:fault", targetExType.getPhysical(), targetType);
return mediator.mediate(source, eSourceDataType, eTargetDataType, metadata);
}
private DataType getFaultType(DataType exceptionType) {
return exceptionType == null ? null : (DataType)exceptionType.getLogical();
}
private boolean typesMatch(Object first, Object second) {
if (first.equals(second)) {
return true;
}
if (first instanceof XMLType && second instanceof XMLType) {
XMLType t1 = (XMLType)first;
XMLType t2 = (XMLType)second;
// TUSCANY-2113, we should compare element names only
return matches(t1.getElementName(), t2.getElementName());
}
return false;
}
/**
* @param qn1
* @param qn2
*/
private boolean matches(QName qn1, QName qn2) {
if (qn1 == qn2) {
return true;
}
if (qn1 == null || qn2 == null) {
return false;
}
String ns1 = qn1.getNamespaceURI();
String ns2 = qn2.getNamespaceURI();
String e1 = qn1.getLocalPart();
String e2 = qn2.getLocalPart();
if (e1.equals(e2) && (ns1.equals(ns2) || ns1.equals(ns2 + "/") || ns2.equals(ns1 + "/"))) {
// Tolerating the trailing / which is required by JAX-WS java package --> xml ns mapping
return true;
}
return false;
}
}
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