JplReference.java

/*-
 * #%L
 * prolobjectlink-jpi-jpl
 * %%
 * Copyright (C) 2012 - 2019 Prolobjectlink Project
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-2.1.html>.
 * #L%
 */
package io.github.prolobjectlink.prolog.jpl;

import static io.github.prolobjectlink.prolog.PrologTermType.OBJECT_TYPE;

import io.github.prolobjectlink.prolog.PrologProvider;
import io.github.prolobjectlink.prolog.PrologReference;
import io.github.prolobjectlink.prolog.PrologTerm;
import jpl.JPL;
import jpl.Term;

public final class JplReference extends JplTerm implements PrologReference {

	JplReference(PrologProvider provider, Term reference) {
		super(OBJECT_TYPE, provider, reference);
	}

	JplReference(PrologProvider provider, Object reference) {
		super(OBJECT_TYPE, provider, JPL.newJRef(reference));
	}

	@Override
	public Class<?> getReferenceType() {
		Object object = getObject();
		if (object != null) {
			object.getClass();
		}
		return null;
	}

	@Override
	public int getArity() {
		return value.arity();
	}

	@Override
	public String getFunctor() {
		return value.name();
	}

	@Override
	public PrologTerm[] getArguments() {
		return toTermArray(value.args(), PrologTerm[].class);
	}

	public Object getObject() {
		if (value.isJFalse()) {
			return Boolean.FALSE;
		} else if (value.isJTrue()) {
			return Boolean.TRUE;
		} else if (value.isJVoid()) {
			return void.class;
		} else if (value.isJRef()) {
			return value.jrefToObject();
		}
		return null;
	}

}