src/lang/JavaPredicate.java

package com.googlecode.prolog_cafe.lang;
import java.util.ArrayList;
/**
 * The abstract class <code>JavaPredicate</code> contains methods
 * for interoperating with Java</em>.<br>
 * For example, the following builtin predicates extends this <code>JavaPredicate</code>.
 * <ul>
 * <li><code>java_constructor</code>
 * <li><code>java_method</code>.
 * </ul>
 * 
 * @author Mutsunori Banbara (banbara@kobe-u.ac.jp)
 * @author Naoyuki Tamura (tamura@kobe-u.ac.jp)
 * @version 1.0
 */
public abstract class JavaPredicate extends Predicate {
    /**
     * Checks whether all terms in <code>args</code> are convertible
     * to the corresponding Java types in <code>paraTypes</code>.
     * @return <code>true</code>
     * if <code>args[i].convertible(paraTypes[i])</code> succeeds for all <code>i</code>,
     * otherwise <code>false</code>.
     * @see Term#convertible(Class)
     */
    protected boolean checkParameterTypes(Class[] paraTypes, Term[] args) {
	int arity;
	arity = paraTypes.length;
	if (arity != args.length)
	    return false;
	for (int i=0; i<arity; i++) {
	    if (! args[i].convertible(paraTypes[i])) {
		return false;
	    }
	}
	return true;
    }
}