Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2016 Dmitry Korotych (dkorotych at gmail dot com).
 *
 * 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.
 */

import java.util.Collections;
import java.util.List;

import java.util.Objects;
import java.util.Optional;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;

public class Main {
    /**
     * Convert a sequence of elements to the list.
     *
     * @param <I> Type of objects for input collection
     * @param <O> Type of objects for output collection
     * @param iterable The sequence of elements to convert. If the input
     *     sequence is empty, then the resulting collection will be empty
     * @param transformer The conversion function. If the transfer function is
     *     not set, the resulting collection will be empty
     * @return Reformed collection of input elements
     */
    public static <I, O> List<O> transformWithoutNull(final Iterable<I> iterable,
            final Function<I, O> transformer) {
        return StreamSupport
                .stream(Optional.ofNullable(iterable).orElse(Collections.<I>emptySet()).spliterator(), false)
                .map(Optional.ofNullable(transformer).orElse(i -> null)).filter(Objects::nonNull)
                .collect(Collectors.toList());
    }
}