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Java primitives library.

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/*
 * Copyright 2015 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.core.lang;

import java.util.Objects;
import java.util.StringJoiner;
import java.util.function.BiConsumer;
import java.util.function.ObjIntConsumer;
import java.util.function.Supplier;
import java.util.stream.IntStream;

/**
 * @author [email protected] (Marcio Endo)
 */
public class Ints {

  private Ints() {
  }

  public static int[] concat(int[]... arrays) {
    int length = 0;
    for (int[] array : arrays) {
      length += array.length;
    }
    int[] result = new int[length];
    int pos = 0;
    for (int[] array : arrays) {
      System.arraycopy(array, 0, result, pos, array.length);
      pos += array.length;
    }
    return result;
  }

  public static String join(String separator, int... array) {
    Objects.requireNonNull(separator);
    Supplier supplier = () -> new StringJoiner(separator);
    ObjIntConsumer accumulator = (joiner, value) -> joiner.add(Integer.toString(value));
    BiConsumer combiner = (a, b) -> a.merge(a);
    return IntStream.of(array).collect(supplier, accumulator, combiner).toString();
  }

}