com.webobjects.eodistribution
Interface EODistributionContext.Delegate

Enclosing class:

EODistributionContext

public static interface EODistributionContext.Delegate

This interface defines the methods that can be implemented by the delegate of EODistributionContexts -- mostly to control security. The delegate does not have to actually implement the interface and all methods of it; it is sufficient to implement just the methods needed, but by implementing the interface the compiler helps to find problems with wrong method signatures.

Method Summary

NSData	distributionContextDidReceiveData(EODistributionContext distributionContext, NSData data) Gives the delegate an opportunity to decrypt data sent from the client.
boolean	distributionContextShouldAllowAccessToClassDescription(EODistributionContext distributionContext, EOClassDescription classDescription) Returns whether the client application of this distribution context should have access to a class description or not.
boolean	distributionContextShouldAllowInvocation(EODistributionContext distributionContext, Object object, NSSelector selector, Object[] arguments) Returns whether a remote method invocation to object should be allowed for the client application of this distribution context or not.
boolean	distributionContextShouldFetchObjectsWithFetchSpecification(EODistributionContext distributionContext, EOFetchSpecification fetchSpecification) Returns whether the client application of this distribution context should be permitted to execute a fetch with a fetch specification.
boolean	distributionContextShouldFetchObjectWithGlobalID(EODistributionContext distributionContext, EOGlobalID globalID, EOClassDescription classDescription) Returns whether the client application of this distribution context should be permitted to fire a fault for a global ID.
boolean	distributionContextShouldFollowKeyPath(EODistributionContext distributionContext, String keyPath) Returns whether a remote method invocation to the object identified by keyPath (which is relative to the invocation target of the distribution context) should be allowed for the client application of this distribution context or not.
boolean	distributionContextShouldSave(EODistributionContext distributionContext, EOEditingContext editingContext) Returns whether the client application of this distribution context should be permitted to save the state of the editing context editingContext (which is the editing context of the distribution context).
NSData	distributionContextWillSendData(EODistributionContext distributionContext, NSData data) Gives the delegate an opportunity to encrypt data sent to the client.

Method Detail

distributionContextDidReceiveData

public NSData distributionContextDidReceiveData(EODistributionContext distributionContext,
                                                NSData data)

Gives the delegate an opportunity to decrypt data sent from the client. Note that the client side has to encrypt the data with the help of the distribution channel delegate.

Parameters:

distributionContext - the distribution context

data - the data received from the client

Returns:

the encrypted data

distributionContextShouldAllowAccessToClassDescription

public boolean distributionContextShouldAllowAccessToClassDescription(EODistributionContext distributionContext,
                                                                      EOClassDescription classDescription)

Returns whether the client application of this distribution context should have access to a class description or not. This method allows you to completely prevent a client from accessing a class description, independent of the client-side class property settings for the corresponding entity.

Parameters:

distributionContext - the distribution context

classDescription - the class description to test

Returns:

true if the access to the class description should be permitted; false otherwise.

distributionContextShouldAllowInvocation

public boolean distributionContextShouldAllowInvocation(EODistributionContext distributionContext,
                                                        Object object,
                                                        NSSelector selector,
                                                        Object[] arguments)

Returns whether a remote method invocation to object should be allowed for the client application of this distribution context or not. If the delegate returns false, an exception is raised and sent to the client, so the method invocation is forbidden.

Parameters:

distributionContext - the distribution context

object - the remote method receiver

selector - the selector identifying the method to be invoked

arguments - the arguments to be passed to the method

Returns:

true if the remote method invocation should be permitted; false otherwise

distributionContextShouldFetchObjectWithGlobalID

public boolean distributionContextShouldFetchObjectWithGlobalID(EODistributionContext distributionContext,
                                                                EOGlobalID globalID,
                                                                EOClassDescription classDescription)

Returns whether the client application of this distribution context should be permitted to fire a fault for a global ID. This method allows you to control in great detail which objects can be fetched or not. Note that not all objects are fetched through firing faults, though. The client can create fetch specifications and fetch objects through them. To control which fetch specifications can be executed, use the distributionContextShouldFetchObjectsWithFetchSpecification method (in addition to this method). If the delegate returns false, an exception is raised and sent to the client, so the fetch is forbidden.

Parameters:

distributionContext - the distribution context

globalID - the global ID to test

classDescription - the class description for the object identified by the global ID.

Returns:

true if the fetch should be permitted; false otherwise

See Also:

distributionContextShouldFetchObjectsWithFetchSpecification(EODistributionContext, EOFetchSpecification)

distributionContextShouldFetchObjectsWithFetchSpecification

public boolean distributionContextShouldFetchObjectsWithFetchSpecification(EODistributionContext distributionContext,
                                                                           EOFetchSpecification fetchSpecification)

Returns whether the client application of this distribution context should be permitted to execute a fetch with a fetch specification. This method allows you to control in great detail which objects can be fetched or not. Note that not all objects are fetched through fetch specifications, though. The client can create fault objects with the help of global IDs and simply fire these faults. To control which faults can be fired, use the distributionContextShouldFetchObjectWithGlobalID method (in addition to this method). If the delegate returns false, an exception is raised and sent to the client, so the fetch is forbidden.

Parameters:

distributionContext - the distribution context

fetchSpecification - the fetch specification to test

Returns:

true if the fetch should be permitted; false otherwise

See Also:

distributionContextShouldFetchObjectWithGlobalID(EODistributionContext, EOGlobalID, EOClassDescription)

distributionContextShouldFollowKeyPath

public boolean distributionContextShouldFollowKeyPath(EODistributionContext distributionContext,
                                                      String keyPath)

Returns whether a remote method invocation to the object identified by keyPath (which is relative to the invocation target of the distribution context) should be allowed for the client application of this distribution context or not. If the delegate returns false, an exception is raised and sent to the client, so the method invocation is forbidden.

Parameters:

distributionContext - the distribution context

keyPath - the key path identifying the remote method target

Returns:

true if the remote method invocation should be permitted; false otherwise

distributionContextShouldSave

public boolean distributionContextShouldSave(EODistributionContext distributionContext,
                                             EOEditingContext editingContext)

Returns whether the client application of this distribution context should be permitted to save the state of the editing context editingContext (which is the editing context of the distribution context). This method allows you to control in great detail which changes a client can make. The delegate can examine the state of the object graph in the editing context and if it returns false, an exception is raised and sent to the client, so the save is forbidden.

Parameters:

distributionContext - the distribution context

editingContext - the editing context to be saved

Returns:

true if the save should be permitted; false otherwise

distributionContextWillSendData

public NSData distributionContextWillSendData(EODistributionContext distributionContext,
                                              NSData data)

Gives the delegate an opportunity to encrypt data sent to the client. Note that the client side has to decrypt the data with the help of the distribution channel delegate.

Parameters:

distributionContext - the distribution context

data - the data to be sent to the client

Returns:

the encrypted data