public abstract class KeyFactory
extends java.lang.Object
equals
and hashCode
methods follow the
the rules laid out in Effective Java by Joshua Bloch.
To generate a KeyFactory
, you need to supply an interface which
describes the structure of the key. The interface should have a
single method named newInstance
, which returns an
Object
. The arguments array can be
anything--Objects, primitive values, or single or
multi-dimension arrays of either. For example:
private interface IntStringKey { public Object newInstance(int i, String s); }
Once you have made a KeyFactory
, you generate a new key by calling
the newInstance
method defined by your interface.
IntStringKey factory = (IntStringKey)KeyFactory.create(IntStringKey.class); Object key1 = factory.newInstance(4, "Hello"); Object key2 = factory.newInstance(4, "World");
Note:
hashCode
equality between two keys key1
and key2
is only guaranteed if
key1.equals(key2)
and the keys were produced by the same factory.
Modifier and Type | Class | Description |
---|---|---|
static class |
KeyFactory.Generator |
Modifier and Type | Field | Description |
---|---|---|
static Customizer |
CLASS_BY_NAME |
|
static Customizer |
OBJECT_BY_CLASS |
Modifier and Type | Method | Description |
---|---|---|
static KeyFactory |
create(java.lang.Class keyInterface) |
|
static KeyFactory |
create(java.lang.ClassLoader loader,
java.lang.Class keyInterface,
Customizer customizer) |
|
static KeyFactory |
create(java.lang.Class keyInterface,
Customizer customizer) |
public static final Customizer CLASS_BY_NAME
public static final Customizer OBJECT_BY_CLASS
public static KeyFactory create(java.lang.Class keyInterface)
public static KeyFactory create(java.lang.Class keyInterface, Customizer customizer)
public static KeyFactory create(java.lang.ClassLoader loader, java.lang.Class keyInterface, Customizer customizer)
Copyright (c) 2001 - Apache Software Foundation