ObjectUtil.java

/*
 * Copyright 1999-2012 Alibaba Group.
 *  
 * 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 com.alibaba.cobar.util;

public final class ObjectUtil {

    /**
     * 递归地比较两个数组是否相同，支持多维数组。
     * <p>
     * 如果比较的对象不是数组，则此方法的结果同<code>ObjectUtil.equals</code>。
     * </p>
     * 
     * @param array1 数组1
     * @param array2 数组2
     * @return 如果相等, 则返回<code>true</code>
     */
    public static boolean equals(Object array1, Object array2) {
        if (array1 == array2) {
            return true;
        }

        if ((array1 == null) || (array2 == null)) {
            return false;
        }

        Class<? extends Object> clazz = array1.getClass();

        if (!clazz.equals(array2.getClass())) {
            return false;
        }

        if (!clazz.isArray()) {
            return array1.equals(array2);
        }

        // array1和array2为同类型的数组
        if (array1 instanceof long[]) {
            long[] longArray1 = (long[]) array1;
            long[] longArray2 = (long[]) array2;

            if (longArray1.length != longArray2.length) {
                return false;
            }

            for (int i = 0; i < longArray1.length; i++) {
                if (longArray1[i] != longArray2[i]) {
                    return false;
                }
            }

            return true;
        } else if (array1 instanceof int[]) {
            int[] intArray1 = (int[]) array1;
            int[] intArray2 = (int[]) array2;

            if (intArray1.length != intArray2.length) {
                return false;
            }

            for (int i = 0; i < intArray1.length; i++) {
                if (intArray1[i] != intArray2[i]) {
                    return false;
                }
            }

            return true;
        } else if (array1 instanceof short[]) {
            short[] shortArray1 = (short[]) array1;
            short[] shortArray2 = (short[]) array2;

            if (shortArray1.length != shortArray2.length) {
                return false;
            }

            for (int i = 0; i < shortArray1.length; i++) {
                if (shortArray1[i] != shortArray2[i]) {
                    return false;
                }
            }

            return true;
        } else if (array1 instanceof byte[]) {
            byte[] byteArray1 = (byte[]) array1;
            byte[] byteArray2 = (byte[]) array2;

            if (byteArray1.length != byteArray2.length) {
                return false;
            }

            for (int i = 0; i < byteArray1.length; i++) {
                if (byteArray1[i] != byteArray2[i]) {
                    return false;
                }
            }

            return true;
        } else if (array1 instanceof double[]) {
            double[] doubleArray1 = (double[]) array1;
            double[] doubleArray2 = (double[]) array2;

            if (doubleArray1.length != doubleArray2.length) {
                return false;
            }

            for (int i = 0; i < doubleArray1.length; i++) {
                if (Double.doubleToLongBits(doubleArray1[i]) != Double.doubleToLongBits(doubleArray2[i])) {
                    return false;
                }
            }

            return true;
        } else if (array1 instanceof float[]) {
            float[] floatArray1 = (float[]) array1;
            float[] floatArray2 = (float[]) array2;

            if (floatArray1.length != floatArray2.length) {
                return false;
            }

            for (int i = 0; i < floatArray1.length; i++) {
                if (Float.floatToIntBits(floatArray1[i]) != Float.floatToIntBits(floatArray2[i])) {
                    return false;
                }
            }

            return true;
        } else if (array1 instanceof boolean[]) {
            boolean[] booleanArray1 = (boolean[]) array1;
            boolean[] booleanArray2 = (boolean[]) array2;

            if (booleanArray1.length != booleanArray2.length) {
                return false;
            }

            for (int i = 0; i < booleanArray1.length; i++) {
                if (booleanArray1[i] != booleanArray2[i]) {
                    return false;
                }
            }

            return true;
        } else if (array1 instanceof char[]) {
            char[] charArray1 = (char[]) array1;
            char[] charArray2 = (char[]) array2;

            if (charArray1.length != charArray2.length) {
                return false;
            }

            for (int i = 0; i < charArray1.length; i++) {
                if (charArray1[i] != charArray2[i]) {
                    return false;
                }
            }

            return true;
        } else {
            Object[] objectArray1 = (Object[]) array1;
            Object[] objectArray2 = (Object[]) array2;

            if (objectArray1.length != objectArray2.length) {
                return false;
            }

            for (int i = 0; i < objectArray1.length; i++) {
                if (!equals(objectArray1[i], objectArray2[i])) {
                    return false;
                }
            }

            return true;
        }
    }

}