| package jp.ac.kobe_u.cs.prolog.builtin; |
| import jp.ac.kobe_u.cs.prolog.lang.*; |
| import java.lang.reflect.*; |
| /** |
| * <code>java_set_declared_field0/3</code> |
| * @author Mutsunori Banbara (banbara@kobe-u.ac.jp) |
| * @author Naoyuki Tamura (tamura@kobe-u.ac.jp) |
| * @version 1.1 |
| */ |
| public class PRED_java_set_declared_field0_3 extends JavaPredicate { |
| Term arg1, arg2, arg3; |
| |
| public PRED_java_set_declared_field0_3(Term a1, Term a2, Term a3, Predicate cont) { |
| arg1 = a1; |
| arg2 = a2; |
| arg3 = a3; |
| this.cont = cont; |
| } |
| public PRED_java_set_declared_field0_3() {} |
| |
| public void setArgument(Term[] args, Predicate cont){ |
| arg1 = args[0]; |
| arg2 = args[1]; |
| arg3 = args[2]; |
| this.cont = cont; |
| } |
| |
| public int arity() { return 3; } |
| |
| public String toString() { |
| return "java_set_declared_field0(" + arg1 + "," + arg2 + "," + arg3 + ")"; |
| } |
| |
| public Predicate exec(Prolog engine) { |
| engine.setB0(); |
| if (!engine.control.getEnableReflection()) |
| throw new PermissionException(this, "reflection", "call", arg1, "disabled"); |
| |
| Term a1, a2, a3; |
| a1 = arg1; |
| a2 = arg2; |
| a3 = arg3; |
| |
| Class clazz = null; |
| Object instance = null; |
| Field field = null; |
| Object value = null; |
| |
| try { |
| // 1st. argument (atom or java term) |
| a1 = a1.dereference(); |
| if (a1.isVariable()) { |
| throw new PInstantiationException(this, 1); |
| } else if (a1.isSymbol()){ // class |
| clazz = Class.forName(((SymbolTerm)a1).name()); |
| } else if (a1.isJavaObject()) { // instance |
| instance = ((JavaObjectTerm)a1).object(); |
| clazz = ((JavaObjectTerm)a1).getClazz(); |
| } else { |
| throw new IllegalTypeException(this, 1, "atom_or_java", a1); |
| } |
| // 2nd. argument (atom) |
| a2 = a2.dereference(); |
| if (a2.isVariable()) { |
| throw new PInstantiationException(this, 2); |
| } else if (! a2.isSymbol()) { |
| throw new IllegalTypeException(this, 2, "atom", a2); |
| } |
| field = clazz.getDeclaredField(((SymbolTerm)a2).name()); |
| // 3rd. argument (term) |
| a3 = a3.dereference(); |
| if (a3.isJavaObject()) |
| value = a3.toJava(); |
| else |
| value = a3; |
| field.setAccessible(true); |
| field.set(instance, value); |
| return cont; |
| } catch (ClassNotFoundException e) { // Class.forName |
| throw new JavaException(this, 1, e); |
| } catch (NoSuchFieldException e) { // Class.getField(..) |
| throw new JavaException(this, 2, e); |
| } catch (SecurityException e) { // Class.getField(..) |
| throw new JavaException(this, 2, e); |
| } catch (NullPointerException e) { // Class.getField(..) |
| throw new JavaException(this, 2, e); |
| } catch (IllegalAccessException e) { // Field.get(..) |
| throw new JavaException(this, 2, e); |
| } catch (IllegalArgumentException e) { // Field.get(..) |
| throw new JavaException(this, 2, e); |
| } |
| } |
| } |
| |
| |