/**
* Process the traversal start event for a query {@link org.plasma.query.model.Property property}
* within an {@link org.plasma.query.model.Expression expression} just traversing the property
* path if exists and capturing context information for the current {@link
* org.plasma.query.model.Expression expression}.
*
* @see org.plasma.query.visitor.DefaultQueryVisitor#start(org.plasma.query.model.Property)
*/
@Override
public void start(Property property) {
org.plasma.query.model.FunctionValues function = property.getFunction();
if (function != null)
throw new GraphFilterException(
"aggregate functions only supported in subqueries not primary queries");
Path path = property.getPath();
PlasmaType targetType = (PlasmaType) this.rootType;
if (path != null) {
for (int i = 0; i < path.getPathNodes().size(); i++) {
AbstractPathElement pathElem = path.getPathNodes().get(i).getPathElement();
if (pathElem instanceof WildcardPathElement)
throw new DataAccessException(
"wildcard path elements applicable for 'Select' clause paths only, not 'Where' clause paths");
String elem = ((PathElement) pathElem).getValue();
PlasmaProperty prop = (PlasmaProperty) targetType.getProperty(elem);
targetType = (PlasmaType) prop.getType(); // traverse
}
}
PlasmaProperty endpointProp = (PlasmaProperty) targetType.getProperty(property.getName());
this.contextProperty = endpointProp;
this.contextType = targetType;
this.contextPropertyPath = property.asPathString();
super.start(property);
}
public String toString() {
StringBuilder buf = new StringBuilder();
buf.append(this.getClass().getSimpleName());
buf.append(" [");
buf.append(property.getName());
buf.append(" ");
buf.append(this.operator.getValue().name());
buf.append(" ");
buf.append(this.literal.getValue());
buf.append("]");
return buf.toString();
}