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A lightweight alternative to Java 8 sequential Stream
/*
* 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.util;
import org.d2ab.util.primitive.Doubles;
import java.util.Arrays;
import java.util.Objects;
import java.util.function.Consumer;
/**
* Utilities for arrays, similar to {@link Arrays} with a few extras like iterators and {@link #forEach}.
*/
public class Arrayz {
private Arrayz() {
}
/**
* Perform the given action once for each item in the given array.
*/
public static void forEach(T[] array, Consumer action) {
for (T item : array)
action.accept(item);
}
/**
* Swap the given items in the given array.
*/
public static void swap(long[] array, int i, int j) {
long temp = array[i];
array[i] = array[j];
array[j] = temp;
}
/**
* Swap the given items in the given array.
*/
public static void swap(int[] array, int i, int j) {
int temp = array[i];
array[i] = array[j];
array[j] = temp;
}
/**
* Swap the given items in the given array.
*/
public static void swap(char[] array, int i, int j) {
char temp = array[i];
array[i] = array[j];
array[j] = temp;
}
/**
* Swap the given items in the given array.
*/
public static void swap(double[] array, int i, int j) {
double temp = array[i];
array[i] = array[j];
array[j] = temp;
}
/**
* Swap the given items in the given array.
*/
public static void swap(Object[] array, int i, int j) {
Object temp = array[i];
array[i] = array[j];
array[j] = temp;
}
/**
* Reverse the given array in place.
*
* @return the given array.
*/
public static Object[] reverse(Object... array) {
for (int i = 0; i < array.length / 2; i++)
swap(array, i, array.length - i - 1);
return array;
}
/**
* Reverse the given array in place.
*
* @return the given array.
*/
public static double[] reverse(double... array) {
for (int i = 0; i < array.length / 2; i++)
swap(array, i, array.length - 1 - i);
return array;
}
/**
* Reverse the given array in place.
*
* @return the given array.
*/
public static int[] reverse(int... array) {
for (int i = 0; i < array.length / 2; i++)
swap(array, i, array.length - 1 - i);
return array;
}
/**
* Reverse the given array in place.
*
* @return the given array.
*/
public static long[] reverse(long... array) {
for (int i = 0; i < array.length / 2; i++)
swap(array, i, array.length - 1 - i);
return array;
}
/**
* Reverse the given array in place.
*
* @return the given array.
*/
public static char[] reverse(char... array) {
for (int i = 0; i < array.length / 2; i++)
swap(array, i, array.length - 1 - i);
return array;
}
/**
* @return true if the given array contains the given target object, false otherwise.
*/
public static boolean contains(T[] elements, T target) {
for (T element : elements)
if (Objects.equals(element, target))
return true;
return false;
}
/**
* @return true if the given array contains the given target {@code char}, false otherwise.
*/
public static boolean contains(char[] items, char target) {
for (char item : items)
if (item == target)
return true;
return false;
}
/**
* @return true if the given array contains the given target {@code int}, false otherwise.
*/
public static boolean contains(int[] items, int target) {
for (int item : items)
if (item == target)
return true;
return false;
}
/**
* @return true if the given array contains the given target {@code long}, false otherwise.
*/
public static boolean contains(long[] items, long target) {
for (long item : items)
if (item == target)
return true;
return false;
}
/**
* @return true if the given array contains the given target {@code double}, false otherwise.
*/
public static boolean contains(double[] items, double target, double precision) {
for (double item : items)
if (Doubles.equal(item, target, precision))
return true;
return false;
}
}