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A lightweight alternative to Java 8 sequential Stream

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/*
 * 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;

import java.util.Collection;
import java.util.function.Function;

/**
 * A {@link Collection} that presents a mapped view of another {@link Collection}.
 */
public class BiMappedCollection extends MappedCollection implements SizedIterable {
	private final Function backMapper;

	public static  Collection from(Collection collection, Function mapper,
	                                        Function backMapper) {
		return new BiMappedCollection<>(collection, mapper, backMapper);
	}

	private BiMappedCollection(Collection collection, Function mapper,
	                           Function backMapper) {
		super(collection, mapper);
		this.backMapper = backMapper;
	}

	@Override
	public boolean add(U u) {
		return collection.add(backMapper.apply(u));
	}
}