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A lightweight alternative to Java 8 sequential Stream

There is a newer version: 2.3.0

/*
 * Copyright 2016 Daniel Skogquist Åborg
 *
 * 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.d2ab.collection.chars;

import org.d2ab.collection.Collectionz;

import java.util.Collection;
import java.util.Set;
import java.util.Spliterator;
import java.util.Spliterators;

/**
 * A primitive specialization of {@link Set} for {@code char} values.
 */
public interface CharSet extends Set, CharCollection {
	@Override
	default boolean isEmpty() {
		return size() == 0;
	}

	@Override
	default void clear() {
		iterator().removeAll();
	}

	@Override
	default boolean add(Character x) {
		return addChar(x);
	}

	@Override
	default boolean contains(Object o) {
		return o instanceof Character && containsChar((char) o);
	}

	@Override
	default boolean remove(Object o) {
		return o instanceof Character && removeChar((char) o);
	}

	@Override
	default Character[] toArray() {
		return toArray(new Character[size()]);
	}

	@Override
	default  T[] toArray(T[] a) {
		return Collectionz.toArray(this, a);
	}

	@Override
	default boolean addAll(Collection c) {
		return Collectionz.addAll(this, c);
	}

	@Override
	default boolean containsAll(Collection c) {
		return Collectionz.containsAll(this, c);
	}

	@Override
	default boolean removeAll(Collection c) {
		return Collectionz.removeAll(this, c);
	}

	@Override
	default boolean retainAll(Collection c) {
		return Collectionz.retainAll(this, c);
	}

	@Override
	default Spliterator.OfInt intSpliterator() {
		return Spliterators.spliterator(intIterator(), size(), Spliterator.DISTINCT);
	}
}