/** * Copyright 2009-2017 the original author or authors. * * 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.apache.ibatis.reflection; import java.util.Arrays; /** * Provides hashCode, equals and toString methods that can handle array. */ public class ArrayUtil { /** * Returns a hash code for {@code obj}. * * @param obj * The object to get a hash code for. May be an array or <code>null</code>. * @return A hash code of {@code obj} or 0 if {@code obj} is <code>null</code> */ public static int hashCode(Object obj) { if (obj == null) { // for consistency with Arrays#hashCode() and Objects#hashCode() return 0; } final Class<?> clazz = obj.getClass(); if (!clazz.isArray()) { return obj.hashCode(); } final Class<?> componentType = clazz.getComponentType(); if (long.class.equals(componentType)) { return Arrays.hashCode((long[]) obj); } else if (int.class.equals(componentType)) { return Arrays.hashCode((int[]) obj); } else if (short.class.equals(componentType)) { return Arrays.hashCode((short[]) obj); } else if (char.class.equals(componentType)) { return Arrays.hashCode((char[]) obj); } else if (byte.class.equals(componentType)) { return Arrays.hashCode((byte[]) obj); } else if (boolean.class.equals(componentType)) { return Arrays.hashCode((boolean[]) obj); } else if (float.class.equals(componentType)) { return Arrays.hashCode((float[]) obj); } else if (double.class.equals(componentType)) { return Arrays.hashCode((double[]) obj); } else { return Arrays.hashCode((Object[]) obj); } } /** * Compares two objects. Returns <code>true</code> if * <ul> * <li>{@code thisObj} and {@code thatObj} are both <code>null</code></li> * <li>{@code thisObj} and {@code thatObj} are instances of the same type and * {@link Object#equals(Object)} returns <code>true</code></li> * <li>{@code thisObj} and {@code thatObj} are arrays with the same component type and * equals() method of {@link Arrays} returns <code>true</code> (not deepEquals())</li> * </ul> * * @param thisObj * The left hand object to compare. May be an array or <code>null</code> * @param thatObj * The right hand object to compare. May be an array or <code>null</code> * @return <code>true</code> if two objects are equal; <code>false</code> otherwise. */ public static boolean equals(Object thisObj, Object thatObj) { if (thisObj == null) { return thatObj == null; } else if (thatObj == null) { return false; } final Class<?> clazz = thisObj.getClass(); if (!clazz.equals(thatObj.getClass())) { return false; } if (!clazz.isArray()) { return thisObj.equals(thatObj); } final Class<?> componentType = clazz.getComponentType(); if (long.class.equals(componentType)) { return Arrays.equals((long[]) thisObj, (long[]) thatObj); } else if (int.class.equals(componentType)) { return Arrays.equals((int[]) thisObj, (int[]) thatObj); } else if (short.class.equals(componentType)) { return Arrays.equals((short[]) thisObj, (short[]) thatObj); } else if (char.class.equals(componentType)) { return Arrays.equals((char[]) thisObj, (char[]) thatObj); } else if (byte.class.equals(componentType)) { return Arrays.equals((byte[]) thisObj, (byte[]) thatObj); } else if (boolean.class.equals(componentType)) { return Arrays.equals((boolean[]) thisObj, (boolean[]) thatObj); } else if (float.class.equals(componentType)) { return Arrays.equals((float[]) thisObj, (float[]) thatObj); } else if (double.class.equals(componentType)) { return Arrays.equals((double[]) thisObj, (double[]) thatObj); } else { return Arrays.equals((Object[]) thisObj, (Object[]) thatObj); } } /** * If the {@code obj} is an array, toString() method of {@link Arrays} is called. Otherwise * {@link Object#toString()} is called. Returns "null" if {@code obj} is <code>null</code>. * * @param obj * An object. May be an array or <code>null</code>. * @return String representation of the {@code obj}. */ public static String toString(Object obj) { if (obj == null) { return "null"; } final Class<?> clazz = obj.getClass(); if (!clazz.isArray()) { return obj.toString(); } final Class<?> componentType = obj.getClass().getComponentType(); if (long.class.equals(componentType)) { return Arrays.toString((long[]) obj); } else if (int.class.equals(componentType)) { return Arrays.toString((int[]) obj); } else if (short.class.equals(componentType)) { return Arrays.toString((short[]) obj); } else if (char.class.equals(componentType)) { return Arrays.toString((char[]) obj); } else if (byte.class.equals(componentType)) { return Arrays.toString((byte[]) obj); } else if (boolean.class.equals(componentType)) { return Arrays.toString((boolean[]) obj); } else if (float.class.equals(componentType)) { return Arrays.toString((float[]) obj); } else if (double.class.equals(componentType)) { return Arrays.toString((double[]) obj); } else { return Arrays.toString((Object[]) obj); } } }