Package org.springframework.cglib.core
Class KeyFactory
java.lang.Object
org.springframework.cglib.core.KeyFactory
Generates classes to handle multi-valued keys, for use in things such as Maps and Sets.
Code for
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.
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Nested Class Summary
Nested Classes -
Field Summary
FieldsModifier and TypeFieldDescriptionstatic final Customizer
static final HashCodeCustomizer
Type.hashCode()
is very expensive as it traverses full descriptor to calculate hash code.static final Customizer
Deprecated.this customizer might result in unexpected class leak since key object still holds a strong reference to the Object and class.static final FieldTypeCustomizer
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic KeyFactory
static KeyFactory
create
(ClassLoader loader, Class keyInterface, Customizer customizer) static KeyFactory
create
(ClassLoader loader, Class keyInterface, KeyFactoryCustomizer customizer, List<KeyFactoryCustomizer> next) static KeyFactory
create
(Class keyInterface, Customizer customizer) static KeyFactory
create
(Class keyInterface, KeyFactoryCustomizer first, List<KeyFactoryCustomizer> next)
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Field Details
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CLASS_BY_NAME
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STORE_CLASS_AS_STRING
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HASH_ASM_TYPE
Type.hashCode()
is very expensive as it traverses full descriptor to calculate hash code. This customizer usesType.getSort()
as a hash code. -
OBJECT_BY_CLASS
Deprecated.this customizer might result in unexpected class leak since key object still holds a strong reference to the Object and class. It is recommended to have pre-processing method that would strip Objects and represent Classes as Strings
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Constructor Details
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KeyFactory
protected KeyFactory()
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Method Details
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create
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create
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create
public static KeyFactory create(Class keyInterface, KeyFactoryCustomizer first, List<KeyFactoryCustomizer> next) -
create
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create
public static KeyFactory create(ClassLoader loader, Class keyInterface, KeyFactoryCustomizer customizer, List<KeyFactoryCustomizer> next)
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