org.joo.libra.common.CompositionPredicate Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of joo-libra Show documentation

Java Predicate with SQL-like syntax support

There is a newer version: 2.1.2

package org.joo.libra.common;

import org.joo.libra.Predicate;
import org.joo.libra.logic.AndPredicate;
import org.joo.libra.logic.NotPredicate;
import org.joo.libra.logic.OrPredicate;

/**
 * Interface for all composition predicates, according to Specification pattern.
 * It provides and, or and not for easily
 * assembling complicated predicates from basic ones.
 * 
 * @author griever
 *
 */
public interface CompositionPredicate extends Predicate {

	/**
	 * Create a new predicate from the current predicate and another predicate. The
	 * new predicate will be satisfied if and only if both the current predicate and
	 * the other predicate are satisfied.
	 * 
	 * @param other
	 *            the predicate
	 * @return new predicate
	 */
	public default Predicate and(final Predicate other) {
		return new AndPredicate(this, other);
	}

	/**
	 * Create a new predicate from the current predicate and another predicate. The
	 * new predicate will be satisfied if and only if either the current predicate
	 * or the other predicate is satisfied.
	 * 
	 * @param other
	 *            the predicate
	 * @return new predicate
	 */
	public default Predicate or(final Predicate other) {
		return new OrPredicate(this, other);
	}

	/**
	 * Create a new predicate from the current predicate. The new predicate will be
	 * satisfied if and only if the current predicate is not satisfied.
	 * 
	 * @return new predicate
	 */
	public default Predicate not() {
		return new NotPredicate(this);
	}
}