org.apache.ibatis.reflection.ArrayUtil Maven / Gradle / Ivy
/**
* 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 null.
* @return A hash code of {@code obj} or 0 if {@code obj} is null
*/
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 true if
*
* - {@code thisObj} and {@code thatObj} are both
null
* - {@code thisObj} and {@code thatObj} are instances of the same type and
* {@link Object#equals(Object)} returns
true
* - {@code thisObj} and {@code thatObj} are arrays with the same component type and
* equals() method of {@link Arrays} returns
true (not deepEquals())
*
*
* @param thisObj
* The left hand object to compare. May be an array or null
* @param thatObj
* The right hand object to compare. May be an array or null
* @return true if two objects are equal; false 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 null.
*
* @param obj
* An object. May be an array or null.
* @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);
}
}
}