java.lang.Object
- com.opengamma.strata.market.surface.ConstantSurface

All Implemented Interfaces:

ParameterizedData, Surface, Serializable, org.joda.beans.Bean, org.joda.beans.ImmutableBean
```
public final class ConstantSurface
extends Object
implements Surface, org.joda.beans.ImmutableBean, Serializable
```
A surface based on a single constant value.
This class defines a surface in terms of a single parameter, the constant value. When queried, zValue(double, double) always returns the constant value. The sensitivity is 1 and the first derivative is 0.
The surface has one parameter, the value of the constant.

See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class ConstantSurface.Meta
The meta-bean for ConstantSurface.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object obj)`
`ValueDerivatives`	`firstPartialDerivatives(double x, double y)`	Computes the partial derivatives of the surface.
`SurfaceMetadata`	`getMetadata()`	Gets the surface metadata.
`double`	`getParameter(int parameterIndex)`	Gets the value of the parameter at the specified index.
`int`	`getParameterCount()`	Gets the number of parameters.
`double`	`getZValue()`	Gets the single z-value.
`int`	`hashCode()`
`static ConstantSurface.Meta`	`meta()`	The meta-bean for `ConstantSurface`.
`ConstantSurface.Meta`	`metaBean()`
`static ConstantSurface`	`of(SurfaceMetadata metadata, double zValue)`	Creates a constant surface with a specific value.
`static ConstantSurface`	`of(SurfaceName name, double zValue)`	Creates a constant surface with a specific value.
`static ConstantSurface`	`of(String name, double zValue)`	Creates a constant surface with a specific value.
`String`	`toString()`
`ConstantSurface`	`withMetadata(SurfaceMetadata metadata)`	Returns a new surface with the specified metadata.
`ConstantSurface`	`withParameter(int parameterIndex, double newValue)`	Returns a copy of the data with the value at the specified index altered.
`ConstantSurface`	`withPerturbation(ParameterPerturbation perturbation)`	Returns a perturbed copy of the data.
`double`	`zValue(double x, double y)`	Computes the z-value for the specified x-value and y-value.
`UnitParameterSensitivity`	`zValueParameterSensitivity(double x, double y)`	Computes the sensitivity of the z-value with respect to the surface parameters.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.joda.beans.Bean
property, propertyNames

Methods inherited from interface com.opengamma.strata.market.surface.Surface
createParameterSensitivity, createParameterSensitivity, findParameterIndex, getName, getParameterMetadata, zValue, zValueParameterSensitivity

- Method Detail
  - of
```
public static ConstantSurface of(String name,
                                 double zValue)
```
    Creates a constant surface with a specific value.
    
    Parameters:
    
    name - the surface name
    
    zValue - the constant z-value
    
    Returns:
    
    the surface
  - of
```
public static ConstantSurface of(SurfaceName name,
                                 double zValue)
```
    Creates a constant surface with a specific value.
    
    Parameters:
    
    name - the surface name
    
    zValue - the constant z-value
    
    Returns:
    
    the surface
  - of
```
public static ConstantSurface of(SurfaceMetadata metadata,
                                 double zValue)
```
    Creates a constant surface with a specific value.
    
    Parameters:
    
    metadata - the surface metadata
    
    zValue - the constant z-value
    
    Returns:
    
    the surface
  - getParameterCount
```
public int getParameterCount()
```
    Description copied from interface: ParameterizedData
    
    Gets the number of parameters.
    This returns the number of parameters, which can be used to create a loop to access the other methods on this interface.
    
    Specified by:
    
    getParameterCount in interface ParameterizedData
    
    Returns:
    
    the number of parameters
  - getParameter
```
public double getParameter(int parameterIndex)
```
    Description copied from interface: ParameterizedData
    
    Gets the value of the parameter at the specified index.
    
    Specified by:
    
    getParameter in interface ParameterizedData
    
    Parameters:
    
    parameterIndex - the zero-based index of the parameter to get
    
    Returns:
    
    the value of the parameter
  - withParameter
```
public ConstantSurface withParameter(int parameterIndex,
                                     double newValue)
```
    Description copied from interface: ParameterizedData
    
    Returns a copy of the data with the value at the specified index altered.
    This instance is immutable and unaffected by this method call.
    
    Specified by:
    
    withParameter in interface ParameterizedData
    
    Specified by:
    
    withParameter in interface Surface
    
    Parameters:
    
    parameterIndex - the zero-based index of the parameter to get
    
    newValue - the new value for the specified parameter
    
    Returns:
    
    a parameterized data instance based on this with the specified parameter altered
  - withPerturbation
```
public ConstantSurface withPerturbation(ParameterPerturbation perturbation)
```
    Description copied from interface: ParameterizedData
    
    Returns a perturbed copy of the data.
    The perturbation instance will be invoked once for each parameter in this instance, returning the perturbed value for that parameter. The result of this method is a new instance that is based on those perturbed values.
    This instance is immutable and unaffected by this method call.
    
    Specified by:
    
    withPerturbation in interface ParameterizedData
    
    Specified by:
    
    withPerturbation in interface Surface
    
    Parameters:
    
    perturbation - the perturbation to apply
    
    Returns:
    
    a parameterized data instance based on this with the specified perturbation applied
  - zValue
```
public double zValue(double x,
                     double y)
```
    Description copied from interface: Surface
    
    Computes the z-value for the specified x-value and y-value.
    
    Specified by:
    
    zValue in interface Surface
    
    Parameters:
    
    x - the x-value to find the z-value for
    
    y - the y-value to find the z-value for
    
    Returns:
    
    the value at the x/y point
  - zValueParameterSensitivity
```
public UnitParameterSensitivity zValueParameterSensitivity(double x,
                                                           double y)
```
    Description copied from interface: Surface
    
    Computes the sensitivity of the z-value with respect to the surface parameters.
    This returns an array with one element for each x-y parameter of the surface. The array contains one a sensitivity value for each parameter used to create the surface.
    
    Specified by:
    
    zValueParameterSensitivity in interface Surface
    
    Parameters:
    
    x - the x-value at which the parameter sensitivity is computed
    
    y - the y-value at which the parameter sensitivity is computed
    
    Returns:
    
    the sensitivity at the x/y/ point
  - firstPartialDerivatives
```
public ValueDerivatives firstPartialDerivatives(double x,
                                                double y)
```
    Description copied from interface: Surface
    Computes the partial derivatives of the surface.
    The first derivatives are dz/dx and dz/dy. The derivatives are in the following order:
    
    [0] derivative with respect to x
    [1] derivative with respect to y
    Specified by:
    
    firstPartialDerivatives in interface Surface
    
    Parameters:
    
    x - the x-value at which the partial derivative is taken
    
    y - the y-value at which the partial derivative is taken
    
    Returns:
    
    the z-value and it's partial first derivatives
  - withMetadata
```
public ConstantSurface withMetadata(SurfaceMetadata metadata)
```
    Description copied from interface: Surface
    
    Returns a new surface with the specified metadata.
    This allows the metadata of the surface to be changed while retaining all other information. If parameter metadata is present, the size of the list must match the number of parameters of this surface.
    
    Specified by:
    
    withMetadata in interface Surface
    
    Parameters:
    
    metadata - the new metadata for the surface
    
    Returns:
    
    the new surface
  - meta
```
public static ConstantSurface.Meta meta()
```
    The meta-bean for ConstantSurface.
    
    Returns:
    
    the meta-bean, not null
  - metaBean
```
public ConstantSurface.Meta metaBean()
```
    Specified by:
    
    metaBean in interface org.joda.beans.Bean
  - getMetadata
```
public SurfaceMetadata getMetadata()
```
    Gets the surface metadata.
    The metadata will have not have parameter metadata.
    
    Specified by:
    
    getMetadata in interface Surface
    
    Returns:
    
    the value of the property, not null
  - getZValue
```
public double getZValue()
```
    Gets the single z-value.
    
    Returns:
    
    the value of the property
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class ConstantSurface

Nested Class Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface org.joda.beans.Bean

Methods inherited from interface com.opengamma.strata.market.surface.Surface

Method Detail

of

of

of

getParameterCount

getParameter

withParameter

withPerturbation

zValue

zValueParameterSensitivity

firstPartialDerivatives

withMetadata

meta

metaBean

getMetadata

getZValue

equals

hashCode

toString