use of org.jpl7.fli.Int64Holder in project packages-jpl by SWI-Prolog.
the class Term method getTerm.
/**
* create and return a org.jpl7.Term representation of the given Prolog term
*
* @param vars_to_Vars
* A Map from Prolog variables to org.jpl7.Variable instances
* @param term
* The Prolog term (in a term_t holder) to convert
* @return The converted Term subclass instance.
*/
protected static Term getTerm(Map<term_t, Variable> vars_to_Vars, term_t term) {
StringHolder hString;
IntHolder hInt;
Int64Holder hInt64;
ObjectHolder hObject;
switch(Prolog.term_type(term)) {
case // 1
Prolog.VARIABLE:
for (Iterator<term_t> i = vars_to_Vars.keySet().iterator(); i.hasNext(); ) {
// a previously seen Prolog
term_t varX = (term_t) i.next();
// variable
if (Prolog.compare(varX, term) == 0) {
// return the
return (Term) vars_to_Vars.get(varX);
// associated JPL
// Variable
}
}
// otherwise, the Prolog variable in term has not been seen before
// allocate a new (sequentially
Variable Var = new Variable();
// named) Variable to represent it
// this should become redundant...
Var.term_ = term;
// use Hashtable(var,null), but only
vars_to_Vars.put(term, Var);
// need set(var)
return Var;
case // 2
Prolog.ATOM:
hString = new StringHolder();
// ignore return val; assume
Prolog.get_atom_chars(term, hString);
// success...
return new Atom(hString.value, "text");
case // 5
Prolog.STRING:
hString = new StringHolder();
// ignore return val; assume
Prolog.get_string_chars(term, hString);
// success...
return new Atom(hString.value, "string");
case // 3
Prolog.INTEGER:
hInt64 = new Int64Holder();
if (Prolog.get_integer(term, hInt64)) {
// Java long...
return new org.jpl7.Integer(hInt64.value);
} else {
hString = new StringHolder();
if (Prolog.get_integer_big(term, hString)) {
// System.out.println("bigint = " + hString.value);
return new org.jpl7.Integer(new java.math.BigInteger(hString.value));
} else {
// arbitrary
return new org.jpl7.Integer(-3);
}
}
case // 4
Prolog.FLOAT:
DoubleHolder hFloatValue = new DoubleHolder();
// assume it succeeds...
Prolog.get_float(term, hFloatValue);
return new org.jpl7.Float(hFloatValue.value);
// 6
case Prolog.COMPOUND:
case // 9
Prolog.LIST_PAIR:
hString = new StringHolder();
hInt = new IntHolder();
// assume it succeeds
Prolog.get_name_arity(term, hString, hInt);
Term[] args = new Term[hInt.value];
// term_t term1 = Prolog.new_term_refs(hArity.value);
for (int i = 1; i <= hInt.value; i++) {
term_t termi = Prolog.new_term_ref();
Prolog.get_arg(i, term, termi);
args[i - 1] = Term.getTerm(vars_to_Vars, termi);
}
return new Compound(hString.value, args);
case // 7
Prolog.LIST_NIL:
return JPL.LIST_NIL;
case // 8
Prolog.BLOB:
hObject = new ObjectHolder();
if (Prolog.get_jref_object(term, hObject)) {
if (hObject.value == null) {
return JPL.JNULL;
} else {
return new JRef(hObject.value);
}
} else {
throw new JPLException("unsupported blob type passed from Prolog");
}
default:
// should never happen
throw new JPLException("unknown term type=" + Prolog.term_type(term));
}
}
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