org.opengis.parameter

Interface ParameterValueGroup

All Superinterfaces:

GeneralParameterValue

@UML(identifier="CC_ParameterValueGroup",
     specification=ISO_19111)
public interface ParameterValueGroup
extends GeneralParameterValue

A group of related parameter values. The same group can be repeated more than once in an coordinate operation or higher level ParameterValueGroup, if those instances contain different values of one or more ParameterValues which suitably distinquish among those groups.

Since:

1.0

See Also:

ParameterDescriptorGroup, ParameterValue

Method Summary

Methods

Modifier and Type	Method and Description
ParameterValueGroup	addGroup(String name) Creates a new group of the specified name.
ParameterValueGroup	clone() Returns a copy of this group of parameter values.
ParameterDescriptorGroup	getDescriptor() The abstract definition of this group of parameters.
List<ParameterValueGroup>	groups(String name) Returns all subgroups with the specified name.
ParameterValue<?>	parameter(String name) Returns the value in this group for the specified identifier code.
List<GeneralParameterValue>	values() Returns the values in this group.

Method Detail

getDescriptor

@UML(identifier="group",
     obligation=MANDATORY,
     specification=ISO_19111)
ParameterDescriptorGroup getDescriptor()

The abstract definition of this group of parameters.

Specified by:

getDescriptor in interface GeneralParameterValue

Returns:

The abstract definition of this parameter or group of parameters.

Departure from OGC/ISO specification:
The ISO name was "group". GeoAPI uses "descriptor" instead in order to override the getDescriptor() generic method provided in the parent interface. In addition the "descriptor" name makes more apparent that this method returns an abstract definition of parameters - not their actual values - and is consistent with usage in other Java libraries like the Java Advanced Imaging library.

values

@UML(identifier="parameterValue",
     obligation=MANDATORY,
     specification=ISO_19111)
List<GeneralParameterValue> values()

Returns the values in this group. The returned list may or may not be unmodifiable; this is implementation-dependent. However, if some aspects of this list are modifiable, then any modification shall be reflected back into this ParameterValueGroup. More specifically:

• If the list supports the add operation, then it should ensure that the added general parameter value is valid and can be added to this group. An InvalidParameterCardinalityException (or any other appropriate exception) shall be thrown if it is not the case.

• The list may also supports the remove operation as a way to remove parameter created by the parameter(String) method.

Returns:

The values in this group.

parameter

ParameterValue<?> parameter(String name)
                            throws ParameterNotFoundException

Returns the value in this group for the specified identifier code. If no parameter value is found but a parameter descriptor is found (which may occurs if the parameter is optional, i.e. minimumOccurs == 0), then a parameter value is automatically created and initialized to its default value (if any).

This convenience method provides a way to get and set parameter values by name. For example the following idiom fetches a floating point value for the "false_easting" parameter:

double value = parameter("false_easting").doubleValue();

This method do not search recursively in subgroups. This is because more than one subgroup may exist for the same descriptor. The user must query all subgroups and select explicitly the appropriate one to use.

Parameters:

name - The case insensitive identifier code of the parameter to search for.

Returns:

The parameter value for the given identifier code.

Throws:

ParameterNotFoundException - if there is no parameter value for the given identifier code.

Departure from OGC/ISO specification:
This method is not part of the ISO specification. It has been added in an attempt to make this interface easier to use.

groups

List<ParameterValueGroup> groups(String name)
                                 throws ParameterNotFoundException

Returns all subgroups with the specified name. This method do not create new groups. If the requested group is optional (i.e. minimumOccurs == 0) and no value were defined previously, then this method returns an empty set.

Parameters:

name - The case insensitive identifier code of the parameter group to search for.

Returns:

The set of all parameter group for the given identifier code.

Throws:

ParameterNotFoundException - if no descriptor was found for the given name.

Departure from OGC/ISO specification:
This method is not part of the ISO specification. It has been added in an attempt to make this interface easier to use.

addGroup

ParameterValueGroup addGroup(String name)
                             throws ParameterNotFoundException,
                                    IllegalStateException

Creates a new group of the specified name. The specified name must be the identifier code of a descriptor group.

Parameters:

name - The case insensitive identifier code of the parameter group to create.

Returns:

A newly created parameter group for the given identifier code.

Throws:

ParameterNotFoundException - if no descriptor was found for the given name.

InvalidParameterCardinalityException - If this parameter group already contains the maximum number of occurences of subgroups of the given name.

IllegalStateException - If the group can not be added for an other raison.

Departure from OGC/ISO specification:
This method is not part of the ISO specification. It has been added in an attempt to make this interface easier to use.

clone

ParameterValueGroup clone()

Returns a copy of this group of parameter values. Included parameter values and subgroups are cloned recursively.

Specified by:

clone in interface GeneralParameterValue

Returns:

A copy of this group of parameter values.