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See:
Description
Interface Summary | |
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GeneralParameterDescriptor | Abstract definition of a parameter or group of parameters used by an operation method. |
GeneralParameterValue | Abstract parameter value or group of parameter values. |
ParameterDescriptor<T> | The definition of a parameter used by an operation method. |
ParameterDescriptorGroup | The definition of a group of related parameters used by an operation method. |
ParameterValue<T> | A parameter value used by an operation method. |
ParameterValueGroup | A group of related parameter values. |
Exception Summary | |
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InvalidParameterCardinalityException | Throws if adding a parameter value to a group would result in more parameters than the maximum occurence allowed. |
InvalidParameterNameException | Thrown when an unexpected parameter was found in a parameter group. |
InvalidParameterTypeException | Thrown when a parameter can't be cast to the requested type. |
InvalidParameterValueException | Thrown when an invalid value was given to a parameter. |
ParameterNotFoundException | Thrown when a required parameter was not found in a parameter group. |
Description and storage of parameter values. The first two paragraphs below are adapted from OpenGIS® Spatial Referencing by Coordinates (Topic 2) specification.
Most parameter values are numeric, but for some operation methods, notably those implementing a grid interpolation algorithm, the parameter value could be a file name and location (this may be a URI). An example is the coordinate transformation from NAD 27 to NAD 83 in the USA; depending on the locations of the points to be transformed, one of a series of grid files should be used.
Some operation methods may require a large number of coordinate operation parameters. Also, some operation methods require that groups of parameters be repeatable as a group. In such cases, it is helpful to group related parameters in parameter groups. Two or more parameter groups are then associated with a particular operation method, and each parameter group consists of a set of operation parameters, or other, nested parameter groups. This way of modelling is not mandatory; all coordinate operation parameters may be assigned directly to the coordinate operation method.
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