org.geotools.parameter
Class Parameter<T>

java.lang.Object
  extended by org.geotools.referencing.wkt.Formattable
      extended by org.geotools.parameter.AbstractParameter
          extended by org.geotools.parameter.Parameter<T>
Type Parameters:
T - The value type.
All Implemented Interfaces:
java.io.Serializable, java.lang.Cloneable, org.opengis.parameter.GeneralParameterValue, org.opengis.parameter.ParameterValue<T>

public class Parameter<T>
extends AbstractParameter
implements org.opengis.parameter.ParameterValue<T>

A parameter value used by an operation method. Most CRS parameter values are numeric, but other types of parameter values are possible. The parameter type can be fetch with the getValue().getClass() idiom. The getValue() and setValue(Object) methods can be invoked at any time. Others getters and setters are parameter-type dependents.

Since:
2.1
Version:
$Id: Parameter.java 33894 2009-09-11 10:51:02Z simonegiannecchini $
Author:
Martin Desruisseaux (IRD), Jody Garnett (Refractions Research)
See Also:
DefaultParameterDescriptor, ParameterGroup, Serialized Form

Field Summary
 
Fields inherited from class org.geotools.referencing.wkt.Formattable
SINGLE_LINE
 
Constructor Summary
Parameter(org.opengis.parameter.ParameterDescriptor<T> descriptor)
          Constructs a parameter value from the specified descriptor.
Parameter(org.opengis.parameter.ParameterDescriptor<T> descriptor, T value)
          Constructs a parameter value from the specified descriptor and value.
 
Method Summary
 boolean booleanValue()
          Returns the boolean value of an operation parameter.
 Parameter clone()
          Returns a clone of this parameter.
static
<T extends org.opengis.util.CodeList>
Parameter<T>
create(java.lang.String name, java.lang.Class<T> type, T value)
          Constructs a parameter from the specified code list.
static Parameter<java.lang.Double> create(java.lang.String name, double value, javax.measure.unit.Unit<?> unit)
          Constructs a parameter from the specified name and value.
static Parameter<java.lang.Integer> create(java.lang.String name, int value)
          Constructs a parameter from the specified name and value.
 double doubleValue()
          Returns the numeric value of the coordinate operation parameter with its associated unit of measure.
 double doubleValue(javax.measure.unit.Unit<?> unit)
          Returns the numeric value of the coordinate operation parameter in the specified unit of measure.
 double[] doubleValueList()
          Returns an ordered sequence of two or more numeric values of an operation parameter list, where each value has the same associated unit of measure.
 double[] doubleValueList(javax.measure.unit.Unit<?> unit)
          Returns an ordered sequence of numeric values in the specified unit of measure.
static
<T> T
ensureValidValue(org.opengis.parameter.ParameterDescriptor<T> descriptor, java.lang.Object value)
          Ensures that the given value is valid according the specified parameter descriptor.
 boolean equals(java.lang.Object object)
          Compares the specified object with this parameter for equality.
 org.opengis.parameter.ParameterDescriptor<T> getDescriptor()
          Returns the abstract definition of this parameter.
 javax.measure.unit.Unit<?> getUnit()
          Returns the unit of measure of the parameter value.
 T getValue()
          Returns the parameter value as an object.
 int hashCode()
          Returns a hash value for this parameter.
 int intValue()
          Returns the positive integer value of an operation parameter, usually used for a count.
 int[] intValueList()
          Returns an ordered sequence of two or more integer values of an operation parameter list, usually used for counts.
 void setValue(boolean value)
          Sets the parameter value as a boolean.
 void setValue(double value)
          Sets the parameter value as a floating point.
 void setValue(double[] values, javax.measure.unit.Unit<?> unit)
          Set the parameter value as an array of floating point and their associated unit.
 void setValue(double value, javax.measure.unit.Unit<?> unit)
          Sets the parameter value as a floating point and its associated unit.
 void setValue(int value)
          Sets the parameter value as an integer.
 void setValue(java.lang.Object value)
          Set the parameter value as an object.
 java.lang.String stringValue()
          Returns the string value of an operation parameter.
 java.net.URI valueFile()
          Returns a reference to a file or a part of a file containing one or more parameter values.
 
Methods inherited from class org.geotools.parameter.AbstractParameter
formatWKT, toString, write
 
Methods inherited from class org.geotools.referencing.wkt.Formattable
cleanupThreadLocals, toWKT, toWKT, toWKT
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

Parameter

public Parameter(org.opengis.parameter.ParameterDescriptor<T> descriptor)
Constructs a parameter value from the specified descriptor. The value will be initialized to the default value, if any.

Parameters:
descriptor - The abstract definition of this parameter.

Parameter

public Parameter(org.opengis.parameter.ParameterDescriptor<T> descriptor,
                 T value)
          throws org.opengis.parameter.InvalidParameterValueException
Constructs a parameter value from the specified descriptor and value.

Parameters:
descriptor - The abstract definition of this parameter.
value - The parameter value.
Throws:
org.opengis.parameter.InvalidParameterValueException - if the type of value is inappropriate for this parameter, or if the value is illegal for some other reason (for example the value is numeric and out of range).
Method Detail

create

public static Parameter<java.lang.Integer> create(java.lang.String name,
                                                  int value)
Constructs a parameter from the specified name and value. This convenience constructor creates a DefaultParameterDescriptor object. But if such an object is available, then the preferred way to get a ParameterValue is to invoke ParameterDescriptor.createValue().

Parameters:
name - The parameter name.
value - The parameter value.
Returns:
A new parameter instance for the given name and value.
Since:
2.5

create

public static Parameter<java.lang.Double> create(java.lang.String name,
                                                 double value,
                                                 javax.measure.unit.Unit<?> unit)
Constructs a parameter from the specified name and value. This convenience constructor creates a DefaultParameterDescriptor object. But if such an object is available, then the preferred way to get a ParameterValue is to invoke ParameterDescriptor.createValue().

Parameters:
name - The parameter name.
value - The parameter value.
unit - The unit for the parameter value.
Returns:
A new parameter instance for the given name and value.
Since:
2.5

create

public static <T extends org.opengis.util.CodeList> Parameter<T> create(java.lang.String name,
                                                                        java.lang.Class<T> type,
                                                                        T value)
Constructs a parameter from the specified code list. This convenience constructor creates a DefaultParameterDescriptor object. But if such an object is available, then the preferred way to get a ParameterValue is to invoke ParameterDescriptor.createValue().

Type Parameters:
T - The parameter type.
Parameters:
name - The parameter name.
type - The parameter type.
value - The parameter value.
Returns:
A new parameter instance for the given name and value.
Since:
2.5

ensureValidValue

public static <T> T ensureValidValue(org.opengis.parameter.ParameterDescriptor<T> descriptor,
                                     java.lang.Object value)
                          throws org.opengis.parameter.InvalidParameterValueException
Ensures that the given value is valid according the specified parameter descriptor. This convenience method ensures that value is assignable to the expected class, is between the minimum and maximum values and is one of the set of valid values. If the value fails any of those tests, then an exception is thrown.

This method is similar to Parameters#isValid(descriptor, value) except that the exception contains an error message formatted with a description of the failure reason.

Type Parameters:
T - The type of parameter value. The given value should typically be an instance of this class. This is not required by this method signature but is checked by this method implementation.
Parameters:
descriptor - The parameter descriptor to check against.
value - The value to check, or null.
Returns:
The value casted to the descriptor parameterized type.
Throws:
org.opengis.parameter.InvalidParameterValueException - if the parameter value is invalid.

getDescriptor

public org.opengis.parameter.ParameterDescriptor<T> getDescriptor()
Returns the abstract definition of this parameter.

Specified by:
getDescriptor in interface org.opengis.parameter.GeneralParameterValue
Specified by:
getDescriptor in interface org.opengis.parameter.ParameterValue<T>
Overrides:
getDescriptor in class AbstractParameter

getUnit

public javax.measure.unit.Unit<?> getUnit()
Returns the unit of measure of the parameter value. If the parameter value has no unit (for example because it is a String type), then this method returns null. Note that "no unit" doesn't means "dimensionless".

Specified by:
getUnit in interface org.opengis.parameter.ParameterValue<T>
Returns:
The unit of measure, or null if none.
See Also:
doubleValue(), doubleValueList(), getValue()

doubleValue

public double doubleValue(javax.measure.unit.Unit<?> unit)
                   throws org.opengis.parameter.InvalidParameterTypeException
Returns the numeric value of the coordinate operation parameter in the specified unit of measure. This convenience method apply unit conversion on the fly as needed.

Specified by:
doubleValue in interface org.opengis.parameter.ParameterValue<T>
Parameters:
unit - The unit of measure for the value to be returned.
Returns:
The numeric value represented by this parameter after conversion to type double and conversion to unit.
Throws:
org.opengis.parameter.InvalidParameterTypeException - if the value is not a numeric type.
java.lang.IllegalArgumentException - if the specified unit is invalid for this parameter.
See Also:
getUnit(), setValue(double,Unit), doubleValueList(Unit)

doubleValue

public double doubleValue()
                   throws org.opengis.parameter.InvalidParameterTypeException
Returns the numeric value of the coordinate operation parameter with its associated unit of measure.

Specified by:
doubleValue in interface org.opengis.parameter.ParameterValue<T>
Returns:
The numeric value represented by this parameter after conversion to type double.
Throws:
org.opengis.parameter.InvalidParameterTypeException - if the value is not a numeric type.
See Also:
getUnit(), setValue(double), doubleValueList()

intValue

public int intValue()
             throws org.opengis.parameter.InvalidParameterTypeException
Returns the positive integer value of an operation parameter, usually used for a count. An integer value does not have an associated unit of measure.

Specified by:
intValue in interface org.opengis.parameter.ParameterValue<T>
Returns:
The numeric value represented by this parameter after conversion to type int.
Throws:
org.opengis.parameter.InvalidParameterTypeException - if the value is not an integer type.
See Also:
setValue(int), intValueList()

booleanValue

public boolean booleanValue()
                     throws org.opengis.parameter.InvalidParameterTypeException
Returns the boolean value of an operation parameter. A boolean value does not have an associated unit of measure.

Specified by:
booleanValue in interface org.opengis.parameter.ParameterValue<T>
Returns:
The boolean value represented by this parameter.
Throws:
org.opengis.parameter.InvalidParameterTypeException - if the value is not a boolean type.
See Also:
setValue(boolean)

stringValue

public java.lang.String stringValue()
                             throws org.opengis.parameter.InvalidParameterTypeException
Returns the string value of an operation parameter. A string value does not have an associated unit of measure.

Specified by:
stringValue in interface org.opengis.parameter.ParameterValue<T>
Returns:
The string value represented by this parameter.
Throws:
org.opengis.parameter.InvalidParameterTypeException - if the value is not a string.
See Also:
getValue(), setValue(Object)

doubleValueList

public double[] doubleValueList(javax.measure.unit.Unit<?> unit)
                         throws org.opengis.parameter.InvalidParameterTypeException
Returns an ordered sequence of numeric values in the specified unit of measure. This convenience method apply unit conversion on the fly as needed.

Specified by:
doubleValueList in interface org.opengis.parameter.ParameterValue<T>
Parameters:
unit - The unit of measure for the value to be returned.
Returns:
The sequence of values represented by this parameter after conversion to type double and conversion to unit.
Throws:
org.opengis.parameter.InvalidParameterTypeException - if the value is not an array of doubles.
java.lang.IllegalArgumentException - if the specified unit is invalid for this parameter.
See Also:
getUnit(), setValue(double[],Unit), doubleValue(Unit)

doubleValueList

public double[] doubleValueList()
                         throws org.opengis.parameter.InvalidParameterTypeException
Returns an ordered sequence of two or more numeric values of an operation parameter list, where each value has the same associated unit of measure.

Specified by:
doubleValueList in interface org.opengis.parameter.ParameterValue<T>
Returns:
The sequence of values represented by this parameter.
Throws:
org.opengis.parameter.InvalidParameterTypeException - if the value is not an array of doubles.
See Also:
getUnit(), setValue(Object), doubleValue()

intValueList

public int[] intValueList()
                   throws org.opengis.parameter.InvalidParameterTypeException
Returns an ordered sequence of two or more integer values of an operation parameter list, usually used for counts. These integer values do not have an associated unit of measure.

Specified by:
intValueList in interface org.opengis.parameter.ParameterValue<T>
Returns:
The sequence of values represented by this parameter.
Throws:
org.opengis.parameter.InvalidParameterTypeException - if the value is not an array of ints.
See Also:
setValue(Object), intValue()

valueFile

public java.net.URI valueFile()
                       throws org.opengis.parameter.InvalidParameterTypeException
Returns a reference to a file or a part of a file containing one or more parameter values. When referencing a part of a file, that file must contain multiple identified parts, such as an XML encoded document. Furthermore, the referenced file or part of a file can reference another part of the same or different files, as allowed in XML documents.

Specified by:
valueFile in interface org.opengis.parameter.ParameterValue<T>
Returns:
The reference to a file containing parameter values.
Throws:
org.opengis.parameter.InvalidParameterTypeException - if the value is not a reference to a file or an URI.
See Also:
getValue(), setValue(Object)

getValue

public T getValue()
Returns the parameter value as an object. The object type is typically a Double, Integer, Boolean, String, URI, double[] or int[].

Specified by:
getValue in interface org.opengis.parameter.ParameterValue<T>
Returns:
The parameter value as an object.
See Also:
setValue(Object)

setValue

public void setValue(double value,
                     javax.measure.unit.Unit<?> unit)
              throws org.opengis.parameter.InvalidParameterValueException
Sets the parameter value as a floating point and its associated unit.

Specified by:
setValue in interface org.opengis.parameter.ParameterValue<T>
Parameters:
value - The parameter value.
unit - The unit for the specified value.
Throws:
org.opengis.parameter.InvalidParameterValueException - if the floating point type is inappropriate for this parameter, or if the value is illegal for some other reason (for example a value out of range).
See Also:
setValue(double), doubleValue(Unit)

setValue

public void setValue(double value)
              throws org.opengis.parameter.InvalidParameterValueException
Sets the parameter value as a floating point. The unit, if any, stay unchanged.

Specified by:
setValue in interface org.opengis.parameter.ParameterValue<T>
Parameters:
value - The parameter value.
Throws:
org.opengis.parameter.InvalidParameterValueException - if the floating point type is inappropriate for this parameter, or if the value is illegal for some other reason (for example a value out of range).
See Also:
setValue(double,Unit), doubleValue()

setValue

public void setValue(int value)
              throws org.opengis.parameter.InvalidParameterValueException
Sets the parameter value as an integer.

Specified by:
setValue in interface org.opengis.parameter.ParameterValue<T>
Parameters:
value - The parameter value.
Throws:
org.opengis.parameter.InvalidParameterValueException - if the integer type is inappropriate for this parameter, or if the value is illegal for some other reason (for example a value out of range).
See Also:
intValue()

setValue

public void setValue(boolean value)
              throws org.opengis.parameter.InvalidParameterValueException
Sets the parameter value as a boolean.

Specified by:
setValue in interface org.opengis.parameter.ParameterValue<T>
Parameters:
value - The parameter value.
Throws:
org.opengis.parameter.InvalidParameterValueException - if the boolean type is inappropriate for this parameter.
See Also:
booleanValue()

setValue

public void setValue(java.lang.Object value)
              throws org.opengis.parameter.InvalidParameterValueException
Set the parameter value as an object. The object type is typically a Double, Integer, Boolean, String, URI, double[] or int[].

Specified by:
setValue in interface org.opengis.parameter.ParameterValue<T>
Parameters:
value - The parameter value.
Throws:
org.opengis.parameter.InvalidParameterValueException - if the type of value is inappropriate for this parameter, or if the value is illegal for some other reason (for example the value is numeric and out of range).
See Also:
getValue()

setValue

public void setValue(double[] values,
                     javax.measure.unit.Unit<?> unit)
              throws org.opengis.parameter.InvalidParameterValueException
Set the parameter value as an array of floating point and their associated unit.

Specified by:
setValue in interface org.opengis.parameter.ParameterValue<T>
Parameters:
values - The parameter values.
unit - The unit for the specified value.
Throws:
org.opengis.parameter.InvalidParameterValueException - if the floating point type is inappropriate for this parameter, or if the value is illegal for some other reason (for example a value out of range).

equals

public boolean equals(java.lang.Object object)
Compares the specified object with this parameter for equality.

Overrides:
equals in class AbstractParameter
Parameters:
object - The object to compare to this.
Returns:
true if both objects are equal.

hashCode

public int hashCode()
Returns a hash value for this parameter.

Overrides:
hashCode in class AbstractParameter
Returns:
The hash code value. This value doesn't need to be the same in past or future versions of this class.

clone

public Parameter clone()
Returns a clone of this parameter.

Specified by:
clone in interface org.opengis.parameter.GeneralParameterValue
Specified by:
clone in interface org.opengis.parameter.ParameterValue<T>
Overrides:
clone in class AbstractParameter


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