org.opengis.feature.type
Interface Operation

All Superinterfaces:

PropertyDescriptor

public interface Operation
extends PropertyDescriptor

An implementation of an operation that may be invoked on an Attribute.

Method Summary

int	getMaxOccurs() Operations are not part of the structure.
int	getMinOccurs() Operations are not part of the structure.
OperationType	getType() Indicates the OpperationType of this attribute
Object	invoke(Attribute target, Object[] params) Invoke this operation on an attribute using the provided parameters.
boolean	isImplemented() Indicates if invoke may be called.

Methods inherited from interface PropertyDescriptor

getName, getUserData, isNillable

Method Detail

getMaxOccurs

int getMaxOccurs()

Operations are not part of the structure.

Specified by:

getMaxOccurs in interface PropertyDescriptor

Returns:

0 in order to not trip up

getMinOccurs

int getMinOccurs()

Operations are not part of the structure.

Specified by:

getMinOccurs in interface PropertyDescriptor

Returns:

0 in order to not trip up

getType

OperationType getType()

Indicates the OpperationType of this attribute

Specified by:

getType in interface PropertyDescriptor

isImplemented

boolean isImplemented()

Indicates if invoke may be called.

In order allow for faithful description of a software system we will need construct models dynamically at runtime, possibly when no implementation of this Operation is available. As an example when working with features in a web application some operations may only be available when being executed on a remote web processing service.

Returns:

true if invoke may be called.

invoke

Object invoke(Attribute target,
              Object[] params)
              throws InvocationTargetException

Invoke this operation on an attribute using the provided parameters.

The state of the attribute may be used and / or updated during the execution of the operation.

Please check to ensure that isImplemented returns true before calling invoke.

Parameters:

target - Attribute this operation is being applied to, the state of this attribute may be changed by this operation.

params - parameters used by the operation

Returns:

the result of the operation

Throws:

InvoationTargetException - if an error occurred while processing

InvocationTargetException