package jp.ac.kobe_u.cs.prolog.builtin;
import jp.ac.kobe_u.cs.prolog.lang.HashMapOfTerm;
import jp.ac.kobe_u.cs.prolog.lang.IllegalDomainException;
import jp.ac.kobe_u.cs.prolog.lang.IllegalTypeException;
import jp.ac.kobe_u.cs.prolog.lang.JavaObjectTerm;
import jp.ac.kobe_u.cs.prolog.lang.ListTerm;
import jp.ac.kobe_u.cs.prolog.lang.PInstantiationException;
import jp.ac.kobe_u.cs.prolog.lang.PermissionException;
import jp.ac.kobe_u.cs.prolog.lang.Predicate;
import jp.ac.kobe_u.cs.prolog.lang.Prolog;
import jp.ac.kobe_u.cs.prolog.lang.StructureTerm;
import jp.ac.kobe_u.cs.prolog.lang.SymbolTerm;
import jp.ac.kobe_u.cs.prolog.lang.Term;
/**
* <code>new_hash/2</code><br>
*
* @author Mutsunori Banbara (banbara@kobe-u.ac.jp)
* @author Naoyuki Tamura (tamura@kobe-u.ac.jp)
* @version 1.0
*/
public class PRED_new_hash_2 extends Predicate {
/**
*
*/
private static final long serialVersionUID = 5747853528773028125L;
private final static SymbolTerm SYM_NIL = SymbolTerm.makeSymbol("[]");
private final static SymbolTerm SYM_ALIAS_1 = SymbolTerm.makeSymbol(
"alias", 1);
private Term arg1, arg2;
public PRED_new_hash_2(Term a1, Term a2, Predicate cont) {
arg1 = a1;
arg2 = a2;
this.cont = cont;
}
public PRED_new_hash_2() {
}
@Override
public void setArgument(Term[] args, Predicate cont) {
arg1 = args[0];
arg2 = args[1];
this.cont = cont;
}
@Override
public int arity() {
return 2;
}
@Override
public String toString() {
return "new_hash(" + arg1 + "," + arg2 + ")";
}
@Override
public Predicate exec(Prolog engine) {
engine.setB0();
Term a1, a2;
a1 = arg1;
a2 = arg2;
a1 = a1.dereference();
if (!a1.isVariable()) {
throw new IllegalTypeException(this, 1, "variable", a1);
}
Term newHash = new JavaObjectTerm(new HashMapOfTerm());
a2 = a2.dereference();
if (a2.isNil()) {
if (!a1.unify(newHash, engine.trail)) {
return engine.fail();
}
return cont;
} else if (!a2.isList()) {
throw new IllegalTypeException(this, 2, "list", a2);
}
// a2 is list
Term tmp = a2;
while (!tmp.isNil()) {
if (tmp.isVariable()) {
throw new PInstantiationException(this, 2);
}
if (!tmp.isList()) {
throw new IllegalTypeException(this, 2, "list", a2);
}
Term car = ((ListTerm) tmp).car().dereference();
if (car.isVariable()) {
throw new PInstantiationException(this, 2);
}
if (car.isStructure()) {
SymbolTerm functor = ((StructureTerm) car).functor();
Term[] args = ((StructureTerm) car).args();
if (functor.equals(SYM_ALIAS_1)) {
Term alias = args[0].dereference();
if (!alias.isSymbol()) {
throw new IllegalDomainException(this, 2,
"hash_option", car);
} else {
if (engine.getHashManager().containsKey(alias)) {
throw new PermissionException(this, "new", "hash",
car, "");
}
engine.getHashManager().put(alias, newHash);
}
} else {
throw new IllegalDomainException(this, 2, "hash_option",
car);
}
} else {
throw new IllegalDomainException(this, 2, "hash_option", car);
}
tmp = ((ListTerm) tmp).cdr().dereference();
}
if (!a1.unify(newHash, engine.trail)) {
return engine.fail();
}
return cont;
}
}