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• Constraint.java

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org.valkyriercp.rules.constraint.Constraint Maven / Gradle / Ivy

package org.valkyriercp.rules.constraint;

/**
 * A function object that tests one argument and returns a single
 * boolean result.
 * 

 * A constraint tests a single argument against some conditional expression. For
 * example, a "required" constraint will return true if the provided argument is
 * non-null or empty, false otherwise.
 * 
 *
 * @author Keith Donald
 */
public interface Constraint {

	/**
	 * Test the provided argument against this predicate's condition.
	 *
	 * @param argument the argument value
	 * @return true if the condition was satisfied,
	 * false otherwise
	 */
	boolean test(Object argument);
}