public GNRemoteQueryDecoder(QueryModel qm, ApplicationContext ctx) {
try {
InternalModelRootNode rn = qm.toInternalQueryModel(ctx);
QueryNodeVisitor qnv =
new QueryNodeVisitor() {
public void visit(AttrPlusTermNode aptn) {
super.visit(aptn);
Element node = new Element("term");
if (aptn.getAccessPoint() != null) {
node.setAttribute(
new Attribute("use", getAttrVal((AttrValue) aptn.getAccessPoint())));
}
if (aptn.getRelation() != null) {
node.setAttribute(
new Attribute("relation", getAttrVal((AttrValue) aptn.getRelation())));
}
if (aptn.getStructure() != null) {
node.setAttribute(
new Attribute("structure", getAttrVal((AttrValue) aptn.getStructure())));
}
if (aptn.getTruncation() != null) {
node.setAttribute(
new Attribute("truncation", getAttrVal((AttrValue) aptn.getTruncation())));
}
node.addContent(aptn.getTermAsString(false));
stack.push(node);
}
public void visit(ComplexNode cn) {
super.visit(cn);
Element rightChild = (Element) stack.pop();
Element leftChild = (Element) stack.pop();
Element node = new Element(getOpString(cn.getOp()));
node.addContent(leftChild);
node.addContent(rightChild);
stack.push(node);
}
public void visit(InternalModelRootNode rn) {
super.visit(rn);
Element query = new Element("query");
// QueryNode node = rn.getChild(); TODO: I dont know if this is important
// query.setAttribute("attrset", node.getAttrs().toString() );
query.addContent((Element) stack.pop());
stack.push(query);
}
@Override
public void onAttrPlusTermNode(AttrPlusTermNode aptn) {
if (Log.isDebugEnabled(Geonet.Z3950_SERVER))
Log.debug(
Geonet.Z3950_SERVER,
"doing nothing..." + aptn); // TODO: find out how this is supposed to be used
}
/**
* @param val
* @return extracts the last index of an attribute (e.G 1.4 becomes 4)
*/
private String getAttrVal(AttrValue val) {
if (val == null || val.getValue() == null) return null;
String value = val.getValue();
String ret = value;
String[] temp = value.split("\\.");
if (temp != null && temp.length > 1) {
ret = temp[temp.length - 1];
}
return ret;
}
};
qnv.visit(rn);
} catch (InvalidQueryException iqe) {
iqe.printStackTrace();
}
}
/**
* {@inheritDoc}
*
* @throws RepositoryException
*/
public Object accept(QueryNodeVisitor visitor, Object data) throws RepositoryException {
return visitor.visit(this, data);
}
