com.sun.appserv.management.util.misc
Class CollectionUtil

java.lang.Object
  com.sun.appserv.management.util.misc.CollectionUtil

public final class CollectionUtil
extends Object

Various helper utilities for Collections.

Method Summary

static <T> void	addArray(Collection<T> c, T[] array) Add all items in an array to a set.
static <T> T	getSingleton(Collection<T> s)
static boolean	isAllStrings(Collection<?> c)
static <T> T[]	toArray(Collection<? extends T> c, Class<T> elementClass)
static String	toString(Collection c)
static String	toString(Collection c, String delim)
static String[]	toStringArray(Collection c)

Methods inherited from class java.lang.Object

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

Method Detail

toString

public static String toString(Collection c,
                              String delim)

Returns:

a String

toString

public static String toString(Collection c)

getSingleton

public static <T> T getSingleton(Collection<T> s)

addArray

public static <T> void addArray(Collection<T> c,
                                T[] array)

Add all items in an array to a set.

toStringArray

public static String[] toStringArray(Collection c)

Returns:

String[]

toArray

public static <T> T[] toArray(Collection<? extends T> c,
                              Class<T> elementClass)

Parameters:

c - the Collection

elementClass - the type of the element, must be non-primitive

Returns:

array of [] elements

isAllStrings

public static boolean isAllStrings(Collection<?> c)

Returns:

true if all elements are String, and there is at least one element