er.directtoweb.assignments.delayed

Class ERDDelayedSelectorInvocationAssignment

java.lang.Object

com.webobjects.directtoweb.Assignment

er.directtoweb.assignments.delayed.ERDDelayedAssignment

er.directtoweb.assignments.delayed.ERDDelayedSelectorInvocationAssignment

All Implemented Interfaces:

EOKeyValueArchiving, ERDComputingAssignmentInterface, Serializable

public class ERDDelayedSelectorInvocationAssignment
extends ERDDelayedAssignment
implements ERDComputingAssignmentInterface

Similar in nature to a key-value assignment, but allows you to construct arbitrary method invocations to resolve rules. As a somewhat contrived example, assume we're inferring on the componentName rule:

entity.name = 'Person' and propertyKey = 'username' -> componentName = (object, componentForKey, propertyKey)

Resolving the rule for componentName, would end up invoking the componentForKey(Object) method on the current object from the rule context, passing the current propertyKey through for the argument. This would boil down to object.componentForKey("username").

The array in the value for this assignment must have two or more objects. The first object is a key path evaluated on the rule context to find the target of the selector. The second object is the selector name, it is a constant and is not evaluated on the rule context. All subsequent objects in the array are treated as key paths to resolve on the rule context to get the arguments for the selector.

Assumptions:

• The arguments to the invoked method must all be Objects. This isn't strictly speaking necessary, but the way the assignment is currently coded, it's required.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ERDDelayedSelectorInvocationAssignment.DefaultImplementation

Nested classes/interfaces inherited from interface com.webobjects.eocontrol.EOKeyValueArchiving

EOKeyValueArchiving._NullValueSupport, EOKeyValueArchiving._NumberSupport, EOKeyValueArchiving._TimestampSupport, EOKeyValueArchiving.Awaking, EOKeyValueArchiving.FinishInitialization, EOKeyValueArchiving.Support

Field Summary

Fields inherited from class com.webobjects.directtoweb.Assignment

KeyPathKey, ValueKey

Fields inherited from interface com.webobjects.eocontrol.EOKeyValueArchiving

_CLASS

Constructor Summary

Constructors

Constructor and Description
ERDDelayedSelectorInvocationAssignment(EOKeyValueUnarchiver u)
ERDDelayedSelectorInvocationAssignment(String key, Object value)

Method Summary

Modifier and Type	Method and Description
static Object	decodeWithKeyValueUnarchiver(EOKeyValueUnarchiver eokeyvalueunarchiver)
NSArray	dependentKeys(String keyPath)
Object	fireNow(com.webobjects.directtoweb.D2WContext c) Implemented by subclasses.

Methods inherited from class er.directtoweb.assignments.delayed.ERDDelayedAssignment

fire

Methods inherited from class com.webobjects.directtoweb.Assignment

encodeWithKeyValueArchiver, keyPath, toString, value, value

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ERDDelayedSelectorInvocationAssignment

public ERDDelayedSelectorInvocationAssignment(EOKeyValueUnarchiver u)

ERDDelayedSelectorInvocationAssignment

public ERDDelayedSelectorInvocationAssignment(String key,
                                              Object value)

Method Detail

decodeWithKeyValueUnarchiver

public static Object decodeWithKeyValueUnarchiver(EOKeyValueUnarchiver eokeyvalueunarchiver)

dependentKeys

public NSArray dependentKeys(String keyPath)

Specified by:

dependentKeys in interface ERDComputingAssignmentInterface

fireNow

public Object fireNow(com.webobjects.directtoweb.D2WContext c)

Description copied from class: ERDDelayedAssignment

Implemented by subclasses.

Specified by:

fireNow in class ERDDelayedAssignment