public void execute(WorkItem workItem, ProcessContext context) throws Exception {
String from = assignment.getFrom();
String to = assignment.getTo();
XPathFactory factory = XPathFactory.newInstance();
XPath xpathFrom = factory.newXPath();
XPathExpression exprFrom = xpathFrom.compile(from);
XPath xpathTo = factory.newXPath();
XPathExpression exprTo = xpathTo.compile(to);
Object target = null;
Object source = null;
if (isInput) {
source = context.getVariable(sourceExpr);
target = ((WorkItem) workItem).getParameter(targetExpr);
} else {
target = context.getVariable(targetExpr);
source = ((WorkItem) workItem).getResult(sourceExpr);
}
Object targetElem = null;
// XPATHExpressionModifier modifier = new XPATHExpressionModifier();
// // modify the tree, returning the root node
// target = modifier.insertMissingData(to, (org.w3c.dom.Node) target);
// now pick the leaf for this operation
if (target != null) {
org.w3c.dom.Node parent = null;
parent = ((org.w3c.dom.Node) target).getParentNode();
targetElem = exprTo.evaluate(parent, XPathConstants.NODE);
if (targetElem == null) {
throw new RuntimeException(
"Nothing was selected by the to expression " + to + " on " + targetExpr);
}
}
NodeList nl = null;
if (source instanceof org.w3c.dom.Node) {
nl = (NodeList) exprFrom.evaluate(source, XPathConstants.NODESET);
} else if (source instanceof String) {
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = builder.newDocument();
// quirky: create a temporary element, use its nodelist
Element temp = doc.createElementNS(null, "temp");
temp.appendChild(doc.createTextNode((String) source));
nl = temp.getChildNodes();
} else if (source == null) {
// don't throw errors yet ?
throw new RuntimeException("Source value was null for source " + sourceExpr);
}
if (nl.getLength() == 0) {
throw new RuntimeException(
"Nothing was selected by the from expression " + from + " on " + sourceExpr);
}
for (int i = 0; i < nl.getLength(); i++) {
if (!(targetElem instanceof org.w3c.dom.Node)) {
if (nl.item(i) instanceof Attr) {
targetElem = ((Attr) nl.item(i)).getValue();
} else if (nl.item(i) instanceof Text) {
targetElem = ((Text) nl.item(i)).getWholeText();
} else {
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = builder.newDocument();
targetElem = doc.importNode(nl.item(i), true);
}
target = targetElem;
} else {
org.w3c.dom.Node n =
((org.w3c.dom.Node) targetElem).getOwnerDocument().importNode(nl.item(i), true);
if (n instanceof Attr) {
((Element) targetElem).setAttributeNode((Attr) n);
} else {
((org.w3c.dom.Node) targetElem).appendChild(n);
}
}
}
if (isInput) {
((WorkItem) workItem).setParameter(targetExpr, target);
} else {
context.setVariable(targetExpr, target);
}
}
