org.springframework.security.acls.domain
Class ObjectIdentityImpl

java.lang.Object
  org.springframework.security.acls.domain.ObjectIdentityImpl

All Implemented Interfaces:

Serializable, ObjectIdentity

public class ObjectIdentityImpl
extends Object
implements ObjectIdentity

Simple implementation of ObjectIdentity.

Uses Strings to store the identity of the domain object instance. Also offers a constructor that uses reflection to build the identity information.

See Also:

Serialized Form

Constructor Summary

ObjectIdentityImpl(Class<?> javaType, Serializable identifier)
Constructor which uses the name of the supplied class as the type property.

ObjectIdentityImpl(Object object)
Creates the ObjectIdentityImpl based on the passed object instance.

ObjectIdentityImpl(String type, Serializable identifier)

Method Summary

boolean	equals(Object arg0) Important so caching operates properly.
Serializable	getIdentifier() Obtains the actual identifier.
String	getType() Obtains the "type" metadata for the domain object.
int	hashCode() Important so caching operates properly.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ObjectIdentityImpl

public ObjectIdentityImpl(String type,
                          Serializable identifier)

ObjectIdentityImpl

public ObjectIdentityImpl(Class<?> javaType,
                          Serializable identifier)

Constructor which uses the name of the supplied class as the type property.

ObjectIdentityImpl

public ObjectIdentityImpl(Object object)
                   throws IdentityUnavailableException

Creates the ObjectIdentityImpl based on the passed object instance. The passed object must provide a getId() method, otherwise an exception will be thrown.

The class name of the object passed will be considered the type, so if more control is required, a different constructor should be used.

Parameters:

object - the domain object instance to create an identity for.

Throws:

IdentityUnavailableException - if identity could not be extracted

Method Detail

equals

public boolean equals(Object arg0)

Important so caching operates properly.

Considers an object of the same class equal if it has the same classname and id properties.

Numeric identities (Integer and Long values) are considered equal if they are numerically equal. Other serializable types are evaluated using a simple equality.

Specified by:

equals in interface ObjectIdentity

Overrides:

equals in class Object

Parameters:

arg0 - object to compare

Returns:

true if the presented object matches this object

See Also:

Object.equals(Object)

getIdentifier

public Serializable getIdentifier()

Description copied from interface: ObjectIdentity

Obtains the actual identifier. This identifier must not be reused to represent other domain objects with the same javaType.

Because ACLs are largely immutable, it is strongly recommended to use a synthetic identifier (such as a database sequence number for the primary key). Do not use an identifier with business meaning, as that business meaning may change in the future such change will cascade to the ACL subsystem data.

Specified by:

getIdentifier in interface ObjectIdentity

Returns:

the identifier (unique within this type; never null)

getType

public String getType()

Description copied from interface: ObjectIdentity

Obtains the "type" metadata for the domain object. This will often be a Java type name (an interface or a class) – traditionally it is the name of the domain object implementation class.

Specified by:

getType in interface ObjectIdentity

Returns:

the "type" of the domain object (never null).

hashCode

public int hashCode()

Important so caching operates properly.

Specified by:

hashCode in interface ObjectIdentity

Overrides:

hashCode in class Object

Returns:

the hash

See Also:

Object.hashCode()

toString

public String toString()

Overrides:

toString in class Object