content: /*
   * Copyright 2002-2021 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
   *
   *      https://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.ttl3.internal.util;
  
  
  ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  //
  // This source code file is copied from spring v5.3.24:
  //
  // https://github.com/spring-projects/spring-framework/blob/v5.3.24/spring-core/src/main/java/org/springframework/util/ObjectUtils.java
  //
  // with adoption:
  // - remove unused elements
  // - adjust visible modifier and code format
  //
  ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  
  import edu.umd.cs.findbugs.annotations.Nullable;
  
  import java.util.Arrays;
  
  /**
   * Miscellaneous object utility methods.
   *
   * <p>Mainly for internal use within the framework.
   *
   * <p>Thanks to Alex Ruiz for contributing several enhancements to this class!
   *
   * @author Juergen Hoeller
   * @author Keith Donald
   * @author Rod Johnson
   * @author Rob Harrop
   * @author Chris Beams
   * @author Sam Brannen
   */
  final class ObjectUtils {
  
      private static final int INITIAL_HASH = 7;
      private static final int MULTIPLIER = 31;
  
  
      //---------------------------------------------------------------------
      // Convenience methods for content-based equality/hash-code handling
      //---------------------------------------------------------------------
  
      /**
       * Determine if the given objects are equal, returning {@code true} if
       * both are {@code null} or {@code false} if only one is {@code null}.
       * <p>Compares arrays with {@code Arrays.equals}, performing an equality
       * check based on the array elements rather than the array reference.
       *
       * @param o1 first Object to compare
       * @param o2 second Object to compare
       * @return whether the given objects are equal
       * @see Object#equals(Object)
       * @see java.util.Arrays#equals
       */
      public static boolean nullSafeEquals(@Nullable Object o1, @Nullable Object o2) {
          if (o1 == o2) {
              return true;
          }
          if (o1 == null || o2 == null) {
              return false;
          }
          if (o1.equals(o2)) {
              return true;
          }
          if (o1.getClass().isArray() && o2.getClass().isArray()) {
              return arrayEquals(o1, o2);
          }
          return false;
      }
  
      /**
       * Compare the given arrays with {@code Arrays.equals}, performing an equality
       * check based on the array elements rather than the array reference.
       *
       * @param o1 first array to compare
       * @param o2 second array to compare
       * @return whether the given objects are equal
       * @see #nullSafeEquals(Object, Object)
       * @see java.util.Arrays#equals
       */
      private static boolean arrayEquals(Object o1, Object o2) {
          if (o1 instanceof Object[] && o2 instanceof Object[]) {
              return Arrays.equals((Object[]) o1, (Object[]) o2);
          }
          if (o1 instanceof boolean[] && o2 instanceof boolean[]) {
              return Arrays.equals((boolean[]) o1, (boolean[]) o2);
          }
          if (o1 instanceof byte[] && o2 instanceof byte[]) {
              return Arrays.equals((byte[]) o1, (byte[]) o2);
          }
          if (o1 instanceof char[] && o2 instanceof char[]) {
              return Arrays.equals((char[]) o1, (char[]) o2);
          }
          if (o1 instanceof double[] && o2 instanceof double[]) {
              return Arrays.equals((double[]) o1, (double[]) o2);
          }
          if (o1 instanceof float[] && o2 instanceof float[]) {
              return Arrays.equals((float[]) o1, (float[]) o2);
          }
          if (o1 instanceof int[] && o2 instanceof int[]) {
              return Arrays.equals((int[]) o1, (int[]) o2);
          }
          if (o1 instanceof long[] && o2 instanceof long[]) {
              return Arrays.equals((long[]) o1, (long[]) o2);
          }
          if (o1 instanceof short[] && o2 instanceof short[]) {
              return Arrays.equals((short[]) o1, (short[]) o2);
          }
          return false;
      }
  
      /**
       * Return as hash code for the given object; typically the value of
       * {@code Object#hashCode()}}. If the object is an array,
       * this method will delegate to any of the {@code nullSafeHashCode}
       * methods for arrays in this class. If the object is {@code null},
       * this method returns 0.
       *
       * @see Object#hashCode()
       * @see #nullSafeHashCode(Object[])
       * @see #nullSafeHashCode(boolean[])
       * @see #nullSafeHashCode(byte[])
       * @see #nullSafeHashCode(char[])
       * @see #nullSafeHashCode(double[])
       * @see #nullSafeHashCode(float[])
       * @see #nullSafeHashCode(int[])
       * @see #nullSafeHashCode(long[])
       * @see #nullSafeHashCode(short[])
       */
      public static int nullSafeHashCode(@Nullable Object obj) {
          if (obj == null) {
              return 0;
          }
          if (obj.getClass().isArray()) {
              if (obj instanceof Object[]) {
                  return nullSafeHashCode((Object[]) obj);
              }
              if (obj instanceof boolean[]) {
                  return nullSafeHashCode((boolean[]) obj);
              }
              if (obj instanceof byte[]) {
                  return nullSafeHashCode((byte[]) obj);
              }
              if (obj instanceof char[]) {
                  return nullSafeHashCode((char[]) obj);
              }
              if (obj instanceof double[]) {
                  return nullSafeHashCode((double[]) obj);
              }
              if (obj instanceof float[]) {
                  return nullSafeHashCode((float[]) obj);
              }
              if (obj instanceof int[]) {
                  return nullSafeHashCode((int[]) obj);
              }
              if (obj instanceof long[]) {
                  return nullSafeHashCode((long[]) obj);
              }
              if (obj instanceof short[]) {
                  return nullSafeHashCode((short[]) obj);
              }
          }
          return obj.hashCode();
      }
  
      /**
       * Return a hash code based on the contents of the specified array.
       * If {@code array} is {@code null}, this method returns 0.
       */
      public static int nullSafeHashCode(@Nullable Object[] array) {
          if (array == null) {
              return 0;
          }
          int hash = INITIAL_HASH;
          for (Object element : array) {
              hash = MULTIPLIER * hash + nullSafeHashCode(element);
          }
          return hash;
      }
  
      /**
       * Return a hash code based on the contents of the specified array.
       * If {@code array} is {@code null}, this method returns 0.
       */
      public static int nullSafeHashCode(@Nullable boolean[] array) {
          if (array == null) {
              return 0;
          }
          int hash = INITIAL_HASH;
          for (boolean element : array) {
              hash = MULTIPLIER * hash + Boolean.hashCode(element);
          }
          return hash;
      }
  
      /**
       * Return a hash code based on the contents of the specified array.
       * If {@code array} is {@code null}, this method returns 0.
       */
      public static int nullSafeHashCode(@Nullable byte[] array) {
          if (array == null) {
              return 0;
          }
          int hash = INITIAL_HASH;
          for (byte element : array) {
              hash = MULTIPLIER * hash + element;
          }
          return hash;
      }
  
      /**
       * Return a hash code based on the contents of the specified array.
       * If {@code array} is {@code null}, this method returns 0.
       */
      public static int nullSafeHashCode(@Nullable char[] array) {
          if (array == null) {
              return 0;
          }
          int hash = INITIAL_HASH;
          for (char element : array) {
              hash = MULTIPLIER * hash + element;
          }
          return hash;
      }
  
      /**
       * Return a hash code based on the contents of the specified array.
       * If {@code array} is {@code null}, this method returns 0.
       */
      public static int nullSafeHashCode(@Nullable double[] array) {
          if (array == null) {
              return 0;
          }
          int hash = INITIAL_HASH;
          for (double element : array) {
              hash = MULTIPLIER * hash + Double.hashCode(element);
          }
          return hash;
      }
  
      /**
       * Return a hash code based on the contents of the specified array.
       * If {@code array} is {@code null}, this method returns 0.
       */
      public static int nullSafeHashCode(@Nullable float[] array) {
          if (array == null) {
              return 0;
          }
          int hash = INITIAL_HASH;
          for (float element : array) {
              hash = MULTIPLIER * hash + Float.hashCode(element);
          }
          return hash;
      }
  
      /**
       * Return a hash code based on the contents of the specified array.
       * If {@code array} is {@code null}, this method returns 0.
       */
      public static int nullSafeHashCode(@Nullable int[] array) {
          if (array == null) {
              return 0;
          }
          int hash = INITIAL_HASH;
          for (int element : array) {
              hash = MULTIPLIER * hash + element;
          }
          return hash;
      }
  
      /**
       * Return a hash code based on the contents of the specified array.
       * If {@code array} is {@code null}, this method returns 0.
       */
      public static int nullSafeHashCode(@Nullable long[] array) {
          if (array == null) {
              return 0;
          }
          int hash = INITIAL_HASH;
          for (long element : array) {
              hash = MULTIPLIER * hash + Long.hashCode(element);
          }
          return hash;
      }
  
      /**
       * Return a hash code based on the contents of the specified array.
       * If {@code array} is {@code null}, this method returns 0.
       */
      public static int nullSafeHashCode(@Nullable short[] array) {
          if (array == null) {
              return 0;
          }
          int hash = INITIAL_HASH;
          for (short element : array) {
              hash = MULTIPLIER * hash + element;
          }
          return hash;
      }
  
  }
  