ArrayUtils.java

package org.apache.commons.lang3;

public class ArrayUtils
{
  public static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];

  public static final Class<?>[] EMPTY_CLASS_ARRAY = new Class[0];

  public static final String[] EMPTY_STRING_ARRAY = new String[0];

  public static final long[] EMPTY_LONG_ARRAY = new long[0];

  public static final Long[] EMPTY_LONG_OBJECT_ARRAY = new Long[0];

  public static final int[] EMPTY_INT_ARRAY = new int[0];

  public static final Integer[] EMPTY_INTEGER_OBJECT_ARRAY = new Integer[0];

  public static final short[] EMPTY_SHORT_ARRAY = new short[0];

  public static final Short[] EMPTY_SHORT_OBJECT_ARRAY = new Short[0];

  public static final byte[] EMPTY_BYTE_ARRAY = new byte[0];

  public static final Byte[] EMPTY_BYTE_OBJECT_ARRAY = new Byte[0];

  public static final double[] EMPTY_DOUBLE_ARRAY = new double[0];

  public static final Double[] EMPTY_DOUBLE_OBJECT_ARRAY = new Double[0];

  public static final float[] EMPTY_FLOAT_ARRAY = new float[0];

  public static final Float[] EMPTY_FLOAT_OBJECT_ARRAY = new Float[0];

  public static final boolean[] EMPTY_BOOLEAN_ARRAY = new boolean[0];

  public static final Boolean[] EMPTY_BOOLEAN_OBJECT_ARRAY = new Boolean[0];

  public static final char[] EMPTY_CHAR_ARRAY = new char[0];

  public static final Character[] EMPTY_CHARACTER_OBJECT_ARRAY = new Character[0];

  public static int indexOf(Object[] array, Object objectToFind)
  {
    return indexOf(array, objectToFind, 0);
  }

  public static int indexOf(Object[] array, Object objectToFind, int startIndex)
  {
    if (array == null) {
      return -1;
    }
    if (startIndex < 0) {
      startIndex = 0;
    }
    if (objectToFind == null) {
      for (int i = startIndex; i < array.length; i++) {
        if (array[i] == null)
          return i;
      }
    }
    else if (array.getClass().getComponentType().isInstance(objectToFind)) {
      for (int i = startIndex; i < array.length; i++) {
        if (objectToFind.equals(array[i])) {
          return i;
        }
      }
    }
    return -1;
  }

  public static boolean contains(Object[] array, Object objectToFind)
  {
    return indexOf(array, objectToFind) != -1;
  }

  public static boolean isEmpty(Object[] array)
  {
    return (array == null) || (array.length == 0);
  }

  public static <T> boolean isNotEmpty(T[] array)
  {
    return (array != null) && (array.length != 0);
  }
}