/**
* Evaluate expression and return a node
*
* @param cexp cexp
* @param ctx ctx
* @return type
* @throws FaultException FaultException
* @throws EvaluationException EvaluationException
*/
public Node evaluateNode(OExpression cexp, EvaluationContext ctx)
throws FaultException, EvaluationException {
List retVal = evaluate(cexp, ctx);
if (retVal.size() == 0) {
throw new FaultException(
cexp.getOwner().getConstants().getQnSelectionFailure(),
"No results for expression: " + cexp);
}
if (retVal.size() > 1) {
throw new FaultException(
cexp.getOwner().getConstants().getQnSelectionFailure(),
"Multiple results for expression: " + cexp);
}
return (Node) retVal.get(0);
}
/**
* Evaluate expression and return a date
*
* @param cexp cexp
* @param context context
* @return type
* @throws FaultException FaultException
* @throws EvaluationException EvaluationException
*/
public Calendar evaluateAsDate(OExpression cexp, EvaluationContext context)
throws FaultException, EvaluationException {
List literal = DOMUtils.toList(evaluate(cexp, context, XPathConstants.NODESET));
if (literal.size() == 0) {
throw new FaultException(
cexp.getOwner().getConstants().getQnSelectionFailure(),
"No results for expression: " + cexp);
}
if (literal.size() > 1) {
throw new FaultException(
cexp.getOwner().getConstants().getQnSelectionFailure(),
"Multiple results for expression: " + cexp);
}
Object date = literal.get(0);
if (date instanceof Calendar) {
return (Calendar) date;
}
if (date instanceof Date) {
Calendar cal = Calendar.getInstance();
cal.setTime((Date) date);
return cal;
}
if (date instanceof Element) {
date = ((Element) date).getTextContent();
}
try {
return ISO8601DateParser.parseCal(date.toString());
} catch (Exception ex) {
String errmsg = "Invalid date: " + literal;
__log.error(errmsg, ex);
throw new FaultException(
cexp.getOwner().getConstants().getQnInvalidExpressionValue(), errmsg);
}
}
/**
* Evaluate expression and return duration
*
* @param cexp cexp
* @param context context
* @return type
* @throws FaultException FaultException
* @throws EvaluationException EvaluationException
*/
public Duration evaluateAsDuration(OExpression cexp, EvaluationContext context)
throws FaultException, EvaluationException {
String literal = this.evaluateAsString(cexp, context);
try {
return new Duration(literal);
} catch (Exception ex) {
String errmsg = "Invalid duration: " + literal;
__log.error(errmsg, ex);
throw new FaultException(
cexp.getOwner().getConstants().getQnInvalidExpressionValue(), errmsg);
}
}
/**
* Evaluate expression and return opaque type
*
* @param cexp cexp
* @param ctx ctx
* @param type type
* @return type
* @throws FaultException FaultException
* @throws EvaluationException EvaluationException
*/
private Object evaluate(OExpression cexp, EvaluationContext ctx, QName type)
throws FaultException, EvaluationException {
try {
OXQuery10ExpressionBPEL20 oxquery10 = ((OXQuery10ExpressionBPEL20) cexp);
XQDataSource xqds = new SaxonXQDataSource();
XQConnection xqconn = xqds.getConnection();
Configuration configuration = ((SaxonXQConnection) xqconn).getConfiguration();
configuration.setAllNodesUntyped(true);
configuration.setHostLanguage(Configuration.XQUERY);
XQStaticContext staticEnv = xqconn.getStaticContext();
NSContext nsContext = oxquery10.getNamespaceCtx();
Set<String> prefixes = nsContext.getPrefixes();
for (String prefix : prefixes) {
String uri = nsContext.getNamespaceURI(prefix);
staticEnv.declareNamespace(prefix, uri);
}
configuration.setSchemaValidationMode(Validation.SKIP);
xqconn.setStaticContext(staticEnv);
// Prepare expression, for starters
String xquery =
oxquery10
.getXquery()
.replaceFirst(
Constants.XQUERY_FUNCTION_HANDLER_COMPILER,
Constants.XQUERY_FUNCTION_HANDLER_RUNTIME);
XQPreparedExpression exp = xqconn.prepareExpression(xquery);
JaxpFunctionResolver funcResolver = new JaxpFunctionResolver(ctx, oxquery10);
JaxpVariableResolver variableResolver =
new JaxpVariableResolver(ctx, oxquery10, configuration);
// Bind external variables to runtime values
for (QName variable : exp.getAllUnboundExternalVariables()) {
// Evaluate referenced variable
Object value = variableResolver.resolveVariable(variable);
if (value instanceof Value) {
SaxonXQConnection saxonConn = (SaxonXQConnection) xqconn;
try {
Item item = ((Value) value).asItem();
if (item == null) {
exp.bindSequence(variable, xqconn.createSequence(Collections.EMPTY_LIST.iterator()));
} else {
XQItem item2 = new SaxonXQItem(item, saxonConn);
exp.bindItem(variable, item2);
}
} catch (XPathException e) {
__log.warn("", e);
}
} else {
if (value instanceof Date) {
Date d = (Date) value;
value = org.apache.ode.utils.ISO8601DateParser.format(d);
}
// Figure out type of variable
XQSequenceType xqType = getItemType(xqconn, value);
// Saxon doesn't like binding sequences to variables
if (value instanceof Node) {
// a node is a node-list, but the inverse isn't true.
// so, if the value is truly a node, leave it alone.
} else if (value instanceof NodeList) {
// So extract the first item from the node list
NodeList nodeList = (NodeList) value;
ArrayList nodeArray = new ArrayList();
for (int i = 0; i < nodeList.getLength(); i++) {
nodeArray.add(nodeList.item(i));
}
value = xqconn.createSequence(nodeArray.iterator());
}
// Bind value with external variable
if (value != null && xqType != null) {
if (value instanceof XQSequence) {
exp.bindSequence(variable, (XQSequence) value);
} else {
if (xqType instanceof XQItemType) {
exp.bindObject(variable, value, (XQItemType) xqType);
}
}
}
}
}
// Set context node
Node contextNode = (ctx.getRootNode() == null) ? DOMUtils.newDocument() : ctx.getRootNode();
contextNode.setUserData(
XQuery10BpelFunctions.USER_DATA_KEY_FUNCTION_RESOLVER, funcResolver, null);
exp.bindItem(
XQConstants.CONTEXT_ITEM,
xqconn.createItemFromNode(contextNode, xqconn.createNodeType()));
// Execute query
XQResultSequence result = exp.executeQuery();
// Cast Saxon result to Java result
Object evalResult = getResultValue(type, result);
if ((evalResult != null) && __log.isDebugEnabled()) {
__log.debug(
"Expression "
+ cexp.toString()
+ " generated result "
+ evalResult
+ " - type="
+ evalResult.getClass().getName());
if (ctx.getRootNode() != null) {
__log.debug("Was using context node " + DOMUtils.domToString(ctx.getRootNode()));
}
}
return evalResult;
} catch (XQException xqe) {
// Extracting the real cause from all this wrapping isn't a simple task
Throwable cause = (xqe.getCause() != null) ? xqe.getCause() : xqe;
if (cause instanceof DynamicError) {
Throwable th = ((DynamicError) cause).getException();
if (th != null) {
cause = th;
if (cause.getCause() != null) {
cause = cause.getCause();
}
}
}
throw new EvaluationException(
"Error while executing an XQuery expression: " + cause.toString(), cause);
} catch (WrappedResolverException wre) {
__log.debug("Could not evaluate expression because of ", wre);
throw (FaultException) wre.getCause();
}
}
