Module org.glassfish.hk2.utilities

Package org.glassfish.hk2.utilities.general

Class GeneralUtilities

java.lang.Object

org.glassfish.hk2.utilities.general.GeneralUtilities

public class GeneralUtilities
extends Object

This class contains utilities useful for any code

Author:

jwells

Constructor Summary

Constructors

Constructor	Description
GeneralUtilities()

Method Summary

Modifier and Type	Method	Description
static <K, V> WeakHashClock<K,V>	getWeakHashClock(boolean isWeak)	Creates a weak hash clock
static <K> WeakHashLRU<K>	getWeakHashLRU(boolean isWeak)	Creates a weak hash clock
static Class<?>	loadClass(ClassLoader cl, String cName)	Loads the class from the given classloader or returns null (does not throw).
static String	prettyPrintBytes(byte[] bytes)	Pretty prints a string of bytes in a hexadecimal format with byte number at the start of the line
static boolean	safeEquals(Object a, Object b)	Returns true if a is equals to b, or both and and b are null.

Methods inherited from class java.lang.Object

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

Constructor Details

GeneralUtilities

public GeneralUtilities()

Method Details

safeEquals

public static boolean safeEquals(Object a,
 Object b)

Returns true if a is equals to b, or both and and b are null. Is safe even if a or b is null. If a or b is null but the other is not null, this returns false

Parameters:

a - A possibly null object to compare

b - A possibly null object to compare

Returns:

true if equal, false if not

loadClass

public static Class<?> loadClass(ClassLoader cl,
 String cName)

Loads the class from the given classloader or returns null (does not throw). Property handles array classes as well

Parameters:

cl - The non-null classloader to load the class from

cName - The fully qualified non-null name of the class to load

Returns:

The class if it could be loaded from the classloader, or null if it could not be found for any reason

getWeakHashClock

public static <K,
V> WeakHashClock<K,V> getWeakHashClock(boolean isWeak)

Creates a weak hash clock

Parameters:

isWeak - if true this will keep weak keyes, if false the keys will be hard and will not go away even if they do not exist anywhere else but this cache

Returns:

A weak hash clock implementation

getWeakHashLRU

public static <K> WeakHashLRU<K> getWeakHashLRU(boolean isWeak)

Creates a weak hash clock

Parameters:

isWeak - if true this will keep weak keyes, if false the keys will be hard and will not go away even if they do not exist anywhere else but this cache

Returns:

A weak hash clock implementation

prettyPrintBytes

public static String prettyPrintBytes(byte[] bytes)

Pretty prints a string of bytes in a hexadecimal format with byte number at the start of the line

Parameters:

bytes - A non-null string of bytes

Returns:

A string that has the bytes pretty-printed