com.webobjects.eocontrol
Class EOKeyGlobalID

java.lang.Object
  |
  +--com.webobjects.eocontrol.EOGlobalID
        |
        +--com.webobjects.eocontrol.EOKeyGlobalID

All Implemented Interfaces:

Cloneable, NSCoding, Serializable

public abstract class EOKeyGlobalID

extends EOGlobalID

implements NSCoding

EOKeyGlobalID is a concrete subclass of EOGlobalID whose instances, an entity and the primary key values for the object being identified, represent persistent IDs based on EOModel information. When creating an EOKeyGlobalID, the key values must be supplied following alphabetical order for their attribute names. EOKeyGlobalID defines the globalIDWithEntityName method for creating instances, but it's much more convenient to create instances from fetched rows using EOEntity's globalIDForRow method. (EOEntity and EOModel are defined in EOAccess.) Note that a constructor can't be used to create EOKeyGlobalIDs

See Also:

globalIDWithEntityName(String entityName, Object[] values), EOEntity.globalIDForRow(NSDictionary row), Serialized Form

Nested Class Summary

Nested classes inherited from class com.webobjects.foundation.NSCoding

NSCoding.Support

Field Summary

Fields inherited from class com.webobjects.eocontrol.EOGlobalID

GlobalIDChangedNotification

Constructor Summary

protected

EOKeyGlobalID(String entityName, int hashCode) Returns an EOKeyGlobalID object

Method Summary

Class	classForCoder() Allows the receiver to substitute a class other than its own (for example, a public superclass) for use during archiving (encoding) by an NSCoder.
static Object	decodeObject(NSCoder coder) (Re)creates an object based on type information and data stored in coder.
void	encodeWithCoder(NSCoder coder) Archives the receiver's type information and data into coder.
String	entityName() Returns the name of the entity governing the object identified by the receiver.
static EOKeyGlobalID	globalIDWithEntityName(String entityName, Object[] values) Returns an EOKeyGlobalID based on entityName and values.
int	hashCode() Returns an integer that can be used as a hash key in a hash table structure.
abstract int	keyCount() Returns the number of keys that form the (potentially composite) primary key of the receiver.
abstract Object[]	keyValues() Returns the keys that form the (potentially composite) primary key of the receiver.
NSArray	keyValuesArray() Returns the keys that form the (potentially composite) primary key of the receiver as an NSArray.
protected Object	readResolve()

Methods inherited from class com.webobjects.eocontrol.EOGlobalID

clone, equals, isTemporary

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EOKeyGlobalID

protected EOKeyGlobalID(String entityName,
                        int hashCode)

Returns an EOKeyGlobalID object

Parameters:

entityName - specifies name of entity

hashCode - specifies hashcode

Method Detail

classForCoder

public Class classForCoder()

Allows the receiver to substitute a class other than its own (for example, a public superclass) for use during archiving (encoding) by an NSCoder. Default is the value of the getClass method.

Specified by:

classForCoder in interface NSCoding

Returns:

the class to be used with an NSCoder

See Also:

encodeWithCoder(NSCoder coder), decodeObject(NSCoder coder), NSCoder, NSCoding

decodeObject

public static Object decodeObject(NSCoder coder)

(Re)creates an object based on type information and data stored in coder.

Returns:

an Object (re)created from the data in coder

See Also:

encodeWithCoder(NSCoder coder), NSCoder, NSCoding

encodeWithCoder

public void encodeWithCoder(NSCoder coder)

Archives the receiver's type information and data into coder. The receiver can then be recreated using decodeObject. Custom type information can be used by overriding classForCoder.

Specified by:

encodeWithCoder in interface NSCoding

Parameters:

coder - stores object type information along with an object's data

See Also:

decodeObject(NSCoder coder), classForCoder(), NSCoder, NSCoding

entityName

public String entityName()

Returns the name of the entity governing the object identified by the receiver. This is used by EODatabaseContexts (EOAccess) to identify an EOEntity (EOAccess) in methods such as faultForGlobalID.

Returns:

a String representing the name of the entity governing the object identified by the receiver

globalIDWithEntityName

public static EOKeyGlobalID globalIDWithEntityName(String entityName,
                                                   Object[] values)

Returns an EOKeyGlobalID based on entityName and values. EOKeyGlobalIDs are more conveniently created using EOEntity's globalIDForRow method (EOAccess).

Parameters:

entityName - name of entity for which the new EOKeyGlobalID will be created

values - specifies primary key values for entityName

Returns:

returns an EOKeyGlobalID based on entityName and values

See Also:

EOEntity.globalIDForRow(NSDictionary row)

hashCode

public int hashCode()

Returns an integer that can be used as a hash key in a hash table structure. If two objects are equal (as determined by the equals method), they must have the same hash value.

Specified by:

hashCode in class EOGlobalID

Returns:

an int that can be used as a hash key in a hash table structure

keyCount

public abstract int keyCount()

Returns the number of keys that form the (potentially composite) primary key of the receiver.

Returns:

the int number of primary key values in the receiver

keyValues

public abstract Object[] keyValues()

Returns the keys that form the (potentially composite) primary key of the receiver.

Returns:

an array of the primary key value(s) of the receiver

See Also:

keyValuesArray()

keyValuesArray

public NSArray keyValuesArray()

Returns the keys that form the (potentially composite) primary key of the receiver as an NSArray.

Returns:

an NSArray of the primary key value(s) of the receiver

See Also:

keyValues()

readResolve

protected Object readResolve()
                      throws ObjectStreamException

ObjectStreamException