Package org.parboiled.common

Class Utils

java.lang.Object
org.parboiled.common.Utils
public final class Utils extends Object
General utility methods.

  • Field Details

    • EMPTY_CHARACTER_OBJECT_ARRAY

      public static final Character[] EMPTY_CHARACTER_OBJECT_ARRAY

    • EMPTY_INTEGER_OBJECT_ARRAY

      public static final Integer[] EMPTY_INTEGER_OBJECT_ARRAY

    • EMPTY_LONG_OBJECT_ARRAY

      public static final Long[] EMPTY_LONG_OBJECT_ARRAY

    • EMPTY_SHORT_OBJECT_ARRAY

      public static final Short[] EMPTY_SHORT_OBJECT_ARRAY

    • EMPTY_BYTE_OBJECT_ARRAY

      public static final Byte[] EMPTY_BYTE_OBJECT_ARRAY

    • EMPTY_FLOAT_OBJECT_ARRAY

      public static final Float[] EMPTY_FLOAT_OBJECT_ARRAY

    • EMPTY_DOUBLE_OBJECT_ARRAY

      public static final Double[] EMPTY_DOUBLE_OBJECT_ARRAY

    • EMPTY_BOOLEAN_OBJECT_ARRAY

      public static final Boolean[] EMPTY_BOOLEAN_OBJECT_ARRAY

  • Method Details

    • toObjectArray

      public static Character[] toObjectArray(char[] array)

    • toObjectArray

      public static Integer[] toObjectArray(int[] array)

    • toObjectArray

      public static Long[] toObjectArray(long[] array)

    • toObjectArray

      public static Short[] toObjectArray(short[] array)

    • toObjectArray

      public static Byte[] toObjectArray(byte[] array)

    • toObjectArray

      public static Float[] toObjectArray(float[] array)

    • toObjectArray

      public static Double[] toObjectArray(double[] array)

    • toObjectArray

      public static Boolean[] toObjectArray(boolean[] array)

    • arrayOf

      public static <T> T[] arrayOf(T firstElement, T... moreElements)
      Joins the given arguments into one array.
      Parameters:
      firstElement - the first element
      moreElements - more elements (optional)
      Returns:
      a new array containing all arguments.

    • arrayOf

      public static <T> T[] arrayOf(T firstElement, T secondElement, T... moreElements)
      Joins the given arguments into one array.
      Parameters:
      firstElement - the first element
      secondElement - the second element
      moreElements - more elements (optional)
      Returns:
      a new array containing all arguments.

    • arrayOf

      public static <T> T[] arrayOf(T[] firstElements, T lastElement)
      Joins the given arguments into one array.
      Parameters:
      firstElements - the first elements
      lastElement - the element to append
      Returns:
      a new array containing all arguments.

    • toString

      public static String toString(Object obj)
      Null enabled toString().
      Parameters:
      obj - the object
      Returns:
      the empty string of obj is null, otherwise obj.toString()

    • equal

      public static <T> boolean equal(T a, T b)
      Null enabled equals().
      Parameters:
      a - the first object
      b - the second object
      Returns:
      true if both are null or both are equal

    • getTypeArguments

      public static List<Class<?>> getTypeArguments(Class<?> base, Class<?> implementation)
      Gets the actual type arguments that are used in a given implementation of a given generic base class or interface. (Based on code copyright 2007 by Ian Robertson).
      Parameters:
      base - the generic base class or interface
      implementation - the type (potentially) implementing the given base class or interface
      Returns:
      a list of the raw classes for the actual type arguments.

    • getClass

      public static Class<?> getClass(Type type)
      Get the underlying class for a type, or null if the type is a variable type. (Copyright 2007 by Ian Robertson).
      Parameters:
      type - the type
      Returns:
      the underlying class

    • isBoxedType

      public static boolean isBoxedType(Class<?> primitive, Class<?> boxed)
      Determines if the primitive type is boxed as the boxed type
      Parameters:
      primitive - the primitive type to check if boxed is the boxed type
      boxed - the possible boxed type of the primitive
      Returns:
      true if boxed is the boxed type of primitive, false otherwise.

    • findConstructor

      public static Constructor findConstructor(Class<?> type, Object[] args)
      Finds the constructor of the given class that is compatible with the given arguments.
      Parameters:
      type - the class to find the constructor of
      args - the arguments
      Returns:
      the constructor

    • humanize

      public static String humanize(long value)
      Formats the given long value into a human readable notation using the Kilo, Mega, Giga, etc. abbreviations.
      Parameters:
      value - the value to format
      Returns:
      the string representation