public abstract class KeyFactory extends 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 and Description |
---|---|
static class |
KeyFactory.Generator |
Modifier and Type | Field and Description |
---|---|
static Customizer |
CLASS_BY_NAME |
static Customizer |
OBJECT_BY_CLASS |
Modifier | Constructor and Description |
---|---|
protected |
KeyFactory() |
Modifier and Type | Method and Description |
---|---|
static KeyFactory |
create(Class keyInterface) |
static KeyFactory |
create(Class keyInterface,
Customizer customizer) |
static KeyFactory |
create(ClassLoader loader,
Class keyInterface,
Customizer customizer) |
public static final Customizer CLASS_BY_NAME
public static final Customizer OBJECT_BY_CLASS
public static KeyFactory create(Class keyInterface)
public static KeyFactory create(Class keyInterface, Customizer customizer)
public static KeyFactory create(ClassLoader loader, Class keyInterface, Customizer customizer)
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