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 org.apache.avro.util.springframework;
  
  import org.apache.avro.reflect.Nullable;
  import org.apache.avro.util.ClassUtils;
  
  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
   * @see ClassUtils see CollectionUtils see StringUtils
   * @since 19.03.2004
   */
  class ObjectUtils {
    private ObjectUtils() {
    }
  
    private static final int INITIAL_HASH = 7;
    private static final int MULTIPLIER = 31;
  
    /**
     * Determine whether the given array is empty: i.e. {@code null} or of zero
     * length.
     *
     * @param array the array to check
     */
    public static boolean isEmpty(@Nullable Object[] array) {
      return (array == null || array.length == 0);
    }
  
    // ---------------------------------------------------------------------
    // 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 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 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;
    }
  }
  