NoItems.java

/*******************************************************************************
 * Copyright 2014 JHC Systems Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package jhc.redsniff.internal.predicates;


import static jhc.redsniff.core.Describer.describable;
import jhc.redsniff.core.Finder;
import jhc.redsniff.internal.core.CollectionOf;

import org.hamcrest.Description;
import org.hamcrest.Factory;
public class NoItems<E> implements Predicate<E, CollectionOf<E>> {

	@Override
	public void describePredicateOnFinder(Finder<E, CollectionOf<E>, ?> finder, Description description) {
		description
			.appendText("not to find any ") 
			.appendDescriptionOf(finder);
	}

	@Override
	public boolean isSatisfiedBy(CollectionOf<E> foundElements) {
		return foundElements.isEmpty();
	}

	@Override
	public void diagnoseNotSatisfyingTo(
			Description dissatisfactionDescription, 
			CollectionOf<E> foundElements, Description notFoundDescription) {
		dissatisfactionDescription
			.appendText("did find:")
			.appendDescriptionOf(describable(foundElements));
	}

	@Factory
	public static <E> Predicate<E, CollectionOf<E>> noElements(){
		return new NoItems<E>();
	}
}