@Override
public void meet(IsNumeric node) throws RuntimeException {
ValueExpr arg = node.getArg();
// operator must be a variable or a constant
if (arg instanceof ValueConstant) {
try {
Double.parseDouble(((ValueConstant) arg).getValue().stringValue());
builder.append(Boolean.toString(true));
} catch (NumberFormatException ex) {
builder.append(Boolean.toString(false));
}
} else if (arg instanceof Var) {
String var = getVariableAlias((Var) arg);
Preconditions.checkState(var != null, "no alias available for variable");
builder
.append("(")
.append(var)
.append(".ntype = 'int' OR ")
.append(var)
.append(".ntype = 'double')");
}
}
@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(IsLiteral node) throws RuntimeException {
ValueExpr arg = node.getArg();
// operator must be a variable or a constant
if (arg instanceof ValueConstant) {
builder.append(Boolean.toString(((ValueConstant) arg).getValue() instanceof Literal));
} else if (arg instanceof Var) {
String var = getVariableAlias((Var) arg);
Preconditions.checkState(var != null, "no alias available for variable");
builder
.append("(")
.append(var)
.append(".ntype = 'string' OR ")
.append(var)
.append(".ntype = 'int' OR ")
.append(var)
.append(".ntype = 'double' OR ")
.append(var)
.append(".ntype = 'date' OR ")
.append(var)
.append(".ntype = 'boolean')");
}
}
@Override
public void meet(IsBNode node) throws RuntimeException {
ValueExpr arg = node.getArg();
// operator must be a variable or a constant
if (arg instanceof ValueConstant) {
builder.append(Boolean.toString(((ValueConstant) arg).getValue() instanceof BNode));
} else if (arg instanceof Var) {
String var = getVariableAlias((Var) arg);
builder.append(var).append(".ntype = 'bnode'");
}
}
@Override
public void meet(Bound node) throws RuntimeException {
ValueExpr arg = node.getArg();
if (arg instanceof ValueConstant) {
builder.append(Boolean.toString(true));
} else if (arg instanceof Var) {
builder.append("(");
optypes.push(ValueType.NODE);
arg.visit(this);
optypes.pop();
builder.append(" IS NOT NULL)");
}
}