    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      https://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.lang3.stream;
    018
    019import java.util.stream.IntStream;
    020
    021/**
    022 * Factory for {@link IntStream}.
    023 * <p>
    024 * <small> Only a factory for now but could hold other functionality.</small>
    025 * </p>
    026 *
    027 * @since 3.13.0
    028 */
    029public class IntStreams {
    030
    031    /**
    032     * Null-safe version of {@link IntStream#of(int[])}.
    033     *
    034     * @param values the elements of the new stream, may be {@code null}.
    035     * @return the new stream on {@code values} or {@link IntStream#empty()}.
    036     * @since 3.18.0
    037     */
    038    @SafeVarargs // Creating a stream from an array is safe
    039    public static IntStream of(final int... values) {
    040        return values == null ? IntStream.empty() : IntStream.of(values);
    041    }
    042
    043    /**
    044     * Shorthand for {@code IntStream.range(0, i)}.
    045     *
    046     * @param endExclusive the exclusive upper bound.
    047     * @return a sequential {@link IntStream} for the range of {@code int} elements.
    048     */
    049    public static IntStream range(final int endExclusive) {
    050        return IntStream.range(0, endExclusive);
    051    }
    052
    053    /**
    054     * Shorthand for {@code IntStream.rangeClosed(0, i)}.
    055     *
    056     * @param endInclusive the inclusive upper bound.
    057     * @return a sequential {@link IntStream} for the range of {@code int} elements.
    058     */
    059    public static IntStream rangeClosed(final int endInclusive) {
    060        return IntStream.rangeClosed(0, endInclusive);
    061    }
    062
    063    /**
    064     * Make private in 4.0.
    065     *
    066     * @deprecated TODO Make private in 4.0.
    067     */
    068    @Deprecated
    069    public IntStreams() {
    070        // empty
    071    }
    072}