| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.pinot.spi.utils; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import javax.annotation.Nonnull; |
| import javax.annotation.Nullable; |
| |
| |
| /** |
| * Various utilities in implementing {@link Object#equals(Object)} and {@link Object#hashCode()}. |
| * |
| * For primitive float and double, {@code isEqual()} is not the same as Java == operator, {@code isEqual(NaN, NaN)} |
| * returns true instead of false. |
| */ |
| public class EqualityUtils { |
| private EqualityUtils() { |
| } |
| |
| public static boolean isEqual(int left, int right) { |
| return left == right; |
| } |
| |
| public static boolean isEqual(long left, long right) { |
| return left == right; |
| } |
| |
| /** |
| * Compare both arguments for equality, and consider {@code Float.NaN} to be equal to {@code Float.NaN} (unlike the |
| * Java == operator). |
| */ |
| public static boolean isEqual(float left, float right) { |
| return Float.floatToIntBits(left) == Float.floatToIntBits(right); |
| } |
| |
| /** |
| * Compare both arguments for equality, and consider {@code Double.NaN} to be equal to {@code Double.NaN} (unlike the |
| * Java == operator). |
| */ |
| public static boolean isEqual(double left, double right) { |
| return Double.doubleToLongBits(left) == Double.doubleToLongBits(right); |
| } |
| |
| public static boolean isEqual(short left, short right) { |
| return left == right; |
| } |
| |
| public static boolean isEqual(char left, char right) { |
| return left == right; |
| } |
| |
| public static boolean isEqual(byte left, byte right) { |
| return left == right; |
| } |
| |
| public static boolean isEqual(@Nullable Object left, @Nullable Object right) { |
| if (left != null && right != null) { |
| // TODO: comparison of sets of arbitrary objects is not specifically supported since |
| // isEqualSet uses isEqualIgnoreOrder which requires sorting. |
| if ((left instanceof Map) && (right instanceof Map)) { |
| return EqualityUtils.isEqualMap((Map) left, (Map) right); |
| } else if ((left instanceof byte[]) && (right instanceof byte[])) { |
| return Arrays.equals((byte[]) left, (byte[]) right); |
| } else if (left.getClass().isArray() && right.getClass().isArray()) { |
| return EqualityUtils.isEqual((Object[]) left, (Object[]) right); |
| } |
| return left.equals(right); |
| } else { |
| return left == right; |
| } |
| } |
| |
| public static boolean isEqual(@Nullable Object[] left, @Nullable Object[] right) { |
| // An effective copy of Arrays.deepEquals but using EqualityUtils.isEqual for |
| // element comparison rather than .equals. |
| if (left == right) { |
| return true; |
| } |
| if (left == null || right == null) { |
| return false; |
| } |
| int length = left.length; |
| if (right.length != length) { |
| return false; |
| } |
| |
| for (int i = 0; i < length; i++) { |
| Object e1 = left[i]; |
| Object e2 = right[i]; |
| |
| if (e1 == e2) { |
| continue; |
| } |
| if (e1 == null) { |
| return false; |
| } |
| |
| boolean eq = EqualityUtils.isEqual(e1, e2); |
| |
| if (!eq) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| public static boolean isEqualMap(@Nullable Map left, @Nullable Map right) { |
| if (left != null && right != null) { |
| if (left.size() != right.size()) { |
| return false; |
| } |
| for (Object key : left.keySet()) { |
| if ((!right.containsKey(key)) || (!EqualityUtils.isEqual(left.get(key), right.get(key)))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| return left == right; |
| } |
| |
| @SuppressWarnings("unchecked") |
| public static boolean isEqualIgnoreOrder(@Nullable List left, @Nullable List right) { |
| if (left != null && right != null) { |
| List sortedLeft = new ArrayList(left); |
| List sortedRight = new ArrayList(right); |
| Collections.sort(sortedLeft); |
| Collections.sort(sortedRight); |
| return sortedLeft.equals(sortedRight); |
| } else { |
| return left == right; |
| } |
| } |
| |
| public static boolean isEqualSet(@Nullable Set left, @Nullable Set right) { |
| if (left != null && right != null) { |
| return isEqualIgnoreOrder(Arrays.asList(left.toArray()), Arrays.asList(right.toArray())); |
| } |
| return left == right; |
| } |
| |
| public static boolean isNullOrNotSameClass(@Nonnull Object left, @Nullable Object right) { |
| return right == null || left.getClass() != right.getClass(); |
| } |
| |
| public static boolean isSameReference(@Nullable Object left, @Nullable Object right) { |
| return left == right; |
| } |
| |
| /** |
| * Given an object, return the hashcode of it. For {@code null}, return 0 instead. |
| */ |
| public static int hashCodeOf(@Nullable Object o) { |
| if (o != null) { |
| return o.hashCode(); |
| } else { |
| return 0; |
| } |
| } |
| |
| public static int hashCodeOf(int previousHashCode, @Nullable Object o) { |
| return 37 * previousHashCode + hashCodeOf(o); |
| } |
| |
| public static int hashCodeOf(int previousHashCode, int value) { |
| return 37 * previousHashCode + value; |
| } |
| |
| public static int hashCodeOf(int previousHashCode, long value) { |
| return 37 * previousHashCode + (int) (value ^ (value >>> 32)); |
| } |
| |
| public static int hashCodeOf(int previousHashCode, boolean value) { |
| return 37 * previousHashCode + (value ? 1 : 0); |
| } |
| } |