org.melati.poem.util

Class EnumUtils

java.lang.Object

org.melati.poem.util.EnumUtils

public final class EnumUtils
extends Object

An assortment of useful operations on Enumerations.

Method Summary

Modifier and Type	Method and Description
static String	concatenated(String sep, Enumeration<?> e) Concatenate an Enumeration, specifying the separator.
static boolean	contains(Enumeration<?> e, Object o) Whether the Enumeration contain an Object.
static <T> Vector<T>	initial(Enumeration<T> e, int n) Create a Vector of the first n Elements of an Enumeration.
static <T> Enumeration<T>	join(Enumeration<T> a, Enumeration<T> b) Join two Enumerations into a single one.
static <T> List<T>	list(Enumeration<T> enumeration)
static <T> int	skip(Enumeration<T> e, int n) Skip a specified number of Elements in an Enumeration.
static <T> Vector<T>	vectorOf(Enumeration<T> e) Create a Vector from an Enumeration, supplying an initial size of 20.
static <T> Vector<T>	vectorOf(Enumeration<T> e, int roughSize) Create a Vector from an Enumeration.

Methods inherited from class java.lang.Object

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

Method Detail

skip

public static <T> int skip(Enumeration<T> e,
                           int n)

Skip a specified number of Elements in an Enumeration.

Parameters:

e - the Enumeration to skip Elements of

n - the number of Elements to skip

Returns:

the number of Elements actually skipped, may be less than asked

initial

public static <T> Vector<T> initial(Enumeration<T> e,
                                    int n)

Create a Vector of the first n Elements of an Enumeration. If the number of elements in the Enumeration is less than n then the remaining elements of the Vector will be null.

Parameters:

e - the input Enumeration

n - the number of Elements to include

Returns:

a new Vector of the initial Elements

join

public static <T> Enumeration<T> join(Enumeration<T> a,
                                      Enumeration<T> b)

Join two Enumerations into a single one.

Parameters:

a - head Enumeration

b - tail Enumeration

Returns:

a new enumeration which is a concatenation of A and B

vectorOf

public static <T> Vector<T> vectorOf(Enumeration<T> e,
                                     int roughSize)

Create a Vector from an Enumeration.

Parameters:

e - the source Enumeration

roughSize - starting size of the Vector

Returns:

a Vector of the Elements of the input Enumeration

vectorOf

public static <T> Vector<T> vectorOf(Enumeration<T> e)

Create a Vector from an Enumeration, supplying an initial size of 20.

Parameters:

e - the source Enumeration

Returns:

a Vector with size at least 20 of the Elements of the input Enumeration

concatenated

public static String concatenated(String sep,
                                  Enumeration<?> e)

Concatenate an Enumeration, specifying the separator.

Parameters:

sep - Separator string

e - Enumeration to be concatenated

Returns:

A String representation of the Enumeration

contains

public static boolean contains(Enumeration<?> e,
                               Object o)

Whether the Enumeration contain an Object.

Parameters:

e - an Enumeration to look in

o - the Object to look for

Returns:

true if the Object occurs in the Enumeration

list

public static <T> List<T> list(Enumeration<T> enumeration)

Returns:

a List from an Enumeration