package jp.ac.kobe_u.cs.prolog.builtin;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import jp.ac.kobe_u.cs.prolog.lang.ExistenceException;
import jp.ac.kobe_u.cs.prolog.lang.IllegalTypeException;
import jp.ac.kobe_u.cs.prolog.lang.JavaException;
import jp.ac.kobe_u.cs.prolog.lang.JavaObjectTerm;
import jp.ac.kobe_u.cs.prolog.lang.JavaPredicate;
import jp.ac.kobe_u.cs.prolog.lang.PInstantiationException;
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>java_declared_constructor0/2</code>
*
* @author Mutsunori Banbara (banbara@kobe-u.ac.jp)
* @author Naoyuki Tamura (tamura@kobe-u.ac.jp)
* @version 1.1
*/
public class PRED_java_declared_constructor0_2 extends JavaPredicate {
/**
*
*/
private static final long serialVersionUID = 3121167598495928046L;
private Term arg1, arg2;
public PRED_java_declared_constructor0_2(Term a1, Term a2, Predicate cont) {
arg1 = a1;
arg2 = a2;
this.cont = cont;
}
public PRED_java_declared_constructor0_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 "java_declared_constructor0(" + arg1 + "," + arg2 + ")";
}
@Override
public Predicate exec(Prolog engine) {
engine.setB0();
Term a1, a2;
a1 = arg1;
a2 = arg2;
Class clazz = null;
Object instance = null;
int arity;
Constructor[] constrs = null;
Term[] pArgs = null;
Object[] jArgs = null;
Constructor c = null;
// 2nd. argument (unbound variable)
a2 = a2.dereference();
if (!a2.isVariable()) {
throw new IllegalTypeException(this, 2, "variable", a2);
}
// 1st. argument (atom or callable term)
try {
a1 = a1.dereference();
if (a1.isVariable()) {
throw new PInstantiationException(this, 1);
}
if (!a1.isSymbol() && !a1.isStructure()) {
throw new IllegalTypeException(this, 1, "callable", a1);
}
if (a1.isSymbol()) { // No argument constructor
clazz = Class.forName(((SymbolTerm) a1).name());
c = clazz.getDeclaredConstructor();
if (c == null) {
throw new ExistenceException(this, 1, "constructor", a1, "");
}
c.setAccessible(true);
instance = c.newInstance();
if (!a2.unify(toPrologTerm(instance), engine.trail)) {
return engine.fail();
}
return cont;
}
// Parameterized constructor
clazz = Class.forName(((StructureTerm) a1).name());
arity = ((StructureTerm) a1).arity();
constrs = clazz.getDeclaredConstructors();
if (constrs.length == 0) {
throw new ExistenceException(this, 1, "constructor", a1, "");
}
pArgs = ((StructureTerm) a1).args();
jArgs = new Object[arity];
for (int i = 0; i < arity; i++) {
pArgs[i] = pArgs[i].dereference();
if (!pArgs[i].isJavaObject()) {
pArgs[i] = new JavaObjectTerm(pArgs[i]);
}
jArgs[i] = pArgs[i].toJava();
}
for (Constructor constr : constrs) {
if (checkParameterTypes(constr.getParameterTypes(), pArgs)) {
try {
c = constr;
c.setAccessible(true);
instance = c.newInstance(jArgs);
break; // Succeeds to create new instance
} catch (Exception e) {
c = null; // Back to loop
}
}
}
if (c == null) {
throw new ExistenceException(this, 1, "constructor", a1, "");
}
if (!a2.unify(toPrologTerm(instance), engine.trail)) {
return engine.fail();
}
return cont;
} catch (ClassNotFoundException e) { // Class.forName(..)
throw new JavaException(this, 1, e);
} catch (InstantiationException e) { // Class.forName(..) or
// Constructor.newInstance()
throw new JavaException(this, 1, e);
} catch (IllegalAccessException e) { // Class.forName(..) or
// Constructor.newInstance()
throw new JavaException(this, 1, e);
} catch (NoSuchMethodException e) { // Class.getDeclaredConstructor()
throw new JavaException(this, 1, e);
} catch (SecurityException e) { // Class.getDeclaredConstructors()
throw new JavaException(this, 1, e);
} catch (IllegalArgumentException e) { // Constructor.newInstance()
throw new JavaException(this, 1, e);
} catch (InvocationTargetException e) { // Constructor.newInstance()
throw new JavaException(this, 1, e);
}
}
private Term toPrologTerm(Object obj) {
if (Term.instanceOfTerm(obj)) {
return (Term) obj;
} else {
return new JavaObjectTerm(obj);
}
}
}