org.parboiled.common

Class Utils

java.lang.Object

org.parboiled.common.Utils

public final class Utils
extends java.lang.Object

General utility methods.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.Boolean[]	EMPTY_BOOLEAN_OBJECT_ARRAY
static java.lang.Byte[]	EMPTY_BYTE_OBJECT_ARRAY
static java.lang.Character[]	EMPTY_CHARACTER_OBJECT_ARRAY
static java.lang.Double[]	EMPTY_DOUBLE_OBJECT_ARRAY
static java.lang.Float[]	EMPTY_FLOAT_OBJECT_ARRAY
static java.lang.Integer[]	EMPTY_INTEGER_OBJECT_ARRAY
static java.lang.Long[]	EMPTY_LONG_OBJECT_ARRAY
static java.lang.Short[]	EMPTY_SHORT_OBJECT_ARRAY

Method Summary

Methods

Modifier and Type	Method and Description
static <T> T[]	arrayOf(T[] firstElements, T lastElement) Joins the given arguments into one array.
static <T> T[]	arrayOf(T firstElement, T... moreElements) Joins the given arguments into one array.
static <T> T[]	arrayOf(T firstElement, T secondElement, T... moreElements) Joins the given arguments into one array.
static <T> boolean	equal(T a, T b) Null enabled equals().
static java.lang.reflect.Constructor	findConstructor(java.lang.Class<?> type, java.lang.Object[] args) Finds the constructor of the given class that is compatible with the given arguments.
static java.lang.Class<?>	getClass(java.lang.reflect.Type type) Get the underlying class for a type, or null if the type is a variable type.
static java.util.List<java.lang.Class<?>>	getTypeArguments(java.lang.Class<?> base, java.lang.Class<?> implementation) Gets the actual type arguments that are used in a given implementation of a given generic base class or interface.
static java.lang.String	humanize(long value) Formats the given long value into a human readable notation using the Kilo, Mega, Giga, etc.
static java.lang.Boolean[]	toObjectArray(boolean[] array)
static java.lang.Byte[]	toObjectArray(byte[] array)
static java.lang.Character[]	toObjectArray(char[] array)
static java.lang.Double[]	toObjectArray(double[] array)
static java.lang.Float[]	toObjectArray(float[] array)
static java.lang.Integer[]	toObjectArray(int[] array)
static java.lang.Long[]	toObjectArray(long[] array)
static java.lang.Short[]	toObjectArray(short[] array)
static java.lang.String	toString(java.lang.Object obj) Null enabled toString().

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

EMPTY_CHARACTER_OBJECT_ARRAY

public static final java.lang.Character[] EMPTY_CHARACTER_OBJECT_ARRAY

EMPTY_INTEGER_OBJECT_ARRAY

public static final java.lang.Integer[] EMPTY_INTEGER_OBJECT_ARRAY

EMPTY_LONG_OBJECT_ARRAY

public static final java.lang.Long[] EMPTY_LONG_OBJECT_ARRAY

EMPTY_SHORT_OBJECT_ARRAY

public static final java.lang.Short[] EMPTY_SHORT_OBJECT_ARRAY

EMPTY_BYTE_OBJECT_ARRAY

public static final java.lang.Byte[] EMPTY_BYTE_OBJECT_ARRAY

EMPTY_FLOAT_OBJECT_ARRAY

public static final java.lang.Float[] EMPTY_FLOAT_OBJECT_ARRAY

EMPTY_DOUBLE_OBJECT_ARRAY

public static final java.lang.Double[] EMPTY_DOUBLE_OBJECT_ARRAY

EMPTY_BOOLEAN_OBJECT_ARRAY

public static final java.lang.Boolean[] EMPTY_BOOLEAN_OBJECT_ARRAY

Method Detail

toObjectArray

public static java.lang.Character[] toObjectArray(char[] array)

toObjectArray

public static java.lang.Integer[] toObjectArray(int[] array)

toObjectArray

public static java.lang.Long[] toObjectArray(long[] array)

toObjectArray

public static java.lang.Short[] toObjectArray(short[] array)

toObjectArray

public static java.lang.Byte[] toObjectArray(byte[] array)

toObjectArray

public static java.lang.Float[] toObjectArray(float[] array)

toObjectArray

public static java.lang.Double[] toObjectArray(double[] array)

toObjectArray

public static java.lang.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 java.lang.String toString(java.lang.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 java.util.List<java.lang.Class<?>> getTypeArguments(java.lang.Class<?> base,
                                                  java.lang.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 java.lang.Class<?> getClass(java.lang.reflect.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

findConstructor

public static java.lang.reflect.Constructor findConstructor(java.lang.Class<?> type,
                                            java.lang.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 java.lang.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