/** {@inheritDoc} No binding will be emitted if the value is null (unbound). */
protected void addBinding(Variable var, Object value) throws IOException {
if (value != null) {
s.append(i(3)).append("<binding name=\"").append(var.getName()).append("\">");
// no dynamic dispatch, so use if/then
if (value instanceof URIReference) addURI((URIReference) value);
else if (value instanceof Literal) addLiteral((Literal) value);
else if (value instanceof BlankNode) addBNode((BlankNode) value);
else
throw new IllegalArgumentException(
"Unable to create a SPARQL response with an answer containing: "
+ value.getClass().getSimpleName());
s.append(i(3)).append("</binding>");
}
}
/** {@inheritDoc} */
protected void addHeaderVariable(Variable var) throws IOException {
s.append(i(2)).append("<variable name=\"");
s.append(var.getName()).append("\"/>");
}