FilterUtils.java

/*
 * Copyright 2023 Global Crop Diversity Trust
 *
 * 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 org.genesys.blocks.util;

import java.util.Collection;

import org.genesys.blocks.model.filters.Filter;

/**
 * A few utilities you may find useful when dealing with {@link Filter}s.
 */
public interface FilterUtils {

	/**
	 * Are all filters empty?
	 * 
	 * @param filters Filters to check, can include {@code null}
	 * @return {@code true} if all filters are {@code null} or {@link Filter#isEmpty()}
	 */
	public static boolean isEmpty(Filter... filters) {
		for (Filter f : filters) {
			if (f != null && !f.isEmpty())
				return false;
		}
		return true;
	}

	/**
	 * Are all collections empty?
	 * 
	 * @param collections Collections to check, can include {@code null}
	 * @return {@code true} if collections are {@code null} or
	 *         {@link Collection#isEmpty()}
	 */
	public static boolean isEmpty(Collection<?>... collections) {
		for (Collection<?> f : collections) {
			if (f != null && !f.isEmpty())
				return false;
		}
		return true;
	}

}