TupleOfNullables.java example

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speedment-master
/**
 *
 * Copyright (c) 2006-2017, Speedment, Inc. All Rights Reserved.
 *
 * 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 com.speedment.common.tuple;

import java.util.Optional;
import java.util.stream.IntStream;
import java.util.stream.Stream;

/**
 * This interface defines a generic Tuple of any order that can hold null
 * values. A Tuple is type safe, immutable and thread safe. For pure non-null
 * value elements see {@link Tuple}
 *
 * @author pemi
 * @see Tuple
 *
 */
public interface TupleOfNullables extends BasicTuple<Optional<Object>> {

    /**
     * Returns a {@link Stream} of all values for this Tuple. If sequential, the
     * Stream will start with the 0:th tuple and progress upwards.
     *
     * @return a {@link Stream} of all values for this Tuple
     */
    default Stream<Optional<Object>> stream() {
        return IntStream.range(0, degree())
            .mapToObj(this::get);
    }

    @Override
    default <T> Stream<T> streamOf(Class<T> clazz) {
        return stream()
            .filter(clazz::isInstance)
            .map(clazz::cast);
    }

}