@Override
public void meet(ValueConstant node) throws RuntimeException {
String val = node.getValue().stringValue();
switch (optypes.peek()) {
case STRING:
case URI:
builder.append("'").append(val).append("'");
break;
case INT:
builder.append(Integer.parseInt(val));
break;
case DECIMAL:
case DOUBLE:
builder.append(Double.parseDouble(val));
break;
case BOOL:
builder.append(Boolean.parseBoolean(val));
break;
case DATE:
builder.append("'").append(sqlDateFormat.format(DateUtils.parseDate(val))).append("'");
break;
// in this case we should return a node ID and also need to make sure it actually exists
case TERM:
case NODE:
KiWiNode n = parent.getConverter().convert(node.getValue());
builder.append(n.getId());
break;
default:
throw new IllegalArgumentException("unsupported value type: " + optypes.peek());
}
}
@Override
public void meet(Exists node) throws RuntimeException {
// TODO: need to make sure that variables of the parent are visible in the subquery
// - pattern names need to be unique even in subqueries
// - variable lookup for expressions in the subquery need to refer to the parent
SQLBuilder sq_builder =
new SQLBuilder(
node.getSubQuery(),
parent.getBindings(),
parent.getDataset(),
parent.getConverter(),
parent.getDialect(),
"_",
Collections.EMPTY_SET,
copyVariables(parent.getVariables()));
builder.append("EXISTS (").append(sq_builder.build()).append(")");
}
