Package org.locationtech.jtstest.geomfunction

Class BaseGeometryFunction

java.lang.Object

org.locationtech.jtstest.geomfunction.BaseGeometryFunction

All Implemented Interfaces:

java.lang.Comparable, GeometryFunction

Direct Known Subclasses:

StaticMethodGeometryFunction

public abstract class BaseGeometryFunction
extends java.lang.Object
implements GeometryFunction, java.lang.Comparable

A base for implementations of GeometryFunction which provides most of the required structure. Extenders must supply the behaviour for the actual function invocation.

Field Summary

Fields

Modifier and Type	Field	Description
protected java.lang.String	category
protected java.lang.String	description
protected java.lang.String	name
protected java.lang.String[]	parameterNames
protected java.lang.Class[]	parameterTypes
protected java.lang.Class	returnType

Constructor Summary

Constructors

Constructor	Description
BaseGeometryFunction(java.lang.String category, java.lang.String name, java.lang.String[] parameterNames, java.lang.Class[] parameterTypes, java.lang.Class returnType)
BaseGeometryFunction(java.lang.String category, java.lang.String name, java.lang.String description, java.lang.String[] parameterNames, java.lang.Class[] parameterTypes, java.lang.Class returnType)

Method Summary

Modifier and Type	Method	Description
private static int	compareTo(java.lang.Class c1, java.lang.Class c2)
int	compareTo(java.lang.Object o)
boolean	equals(java.lang.Object obj)	Two functions are the same if they have the same signature (name, parameter types and return type).
static int	firstScalarParamIndex(GeometryFunction func)
java.lang.String	getCategory()	Gets the category name of this function
java.lang.String	getDescription()	Gets the description of this function
protected static java.lang.Double	getDoubleOrNull(java.lang.Object[] args, int index)
protected static java.lang.Integer	getIntegerOrNull(java.lang.Object[] args, int index)
java.lang.String	getName()	Gets the name of this function
java.lang.String[]	getParameterNames()	Gets the parameter names for this function
java.lang.Class[]	getParameterTypes()	Gets the types of the other function arguments, if any.
java.lang.Class	getReturnType()	Gets the return type of this function
java.lang.String	getSignature()	Gets a string representing the signature of this function.
abstract java.lang.Object	invoke(Geometry geom, java.lang.Object[] args)	Invokes this function.
boolean	isBinary()
static boolean	isBinaryGeomFunction(GeometryFunction func)

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

category

protected java.lang.String category

name

protected java.lang.String name

description

protected java.lang.String description

parameterNames

protected java.lang.String[] parameterNames

parameterTypes

protected java.lang.Class[] parameterTypes

returnType

protected java.lang.Class returnType

Constructor Detail

BaseGeometryFunction

public BaseGeometryFunction(java.lang.String category,
                            java.lang.String name,
                            java.lang.String[] parameterNames,
                            java.lang.Class[] parameterTypes,
                            java.lang.Class returnType)

BaseGeometryFunction

public BaseGeometryFunction(java.lang.String category,
                            java.lang.String name,
                            java.lang.String description,
                            java.lang.String[] parameterNames,
                            java.lang.Class[] parameterTypes,
                            java.lang.Class returnType)

Method Detail

isBinaryGeomFunction

public static boolean isBinaryGeomFunction(GeometryFunction func)

firstScalarParamIndex

public static int firstScalarParamIndex(GeometryFunction func)

getCategory

public java.lang.String getCategory()

Description copied from interface: GeometryFunction

Gets the category name of this function

Specified by:

getCategory in interface GeometryFunction

Returns:

the category name of the function

getName

public java.lang.String getName()

Description copied from interface: GeometryFunction

Gets the name of this function

Specified by:

getName in interface GeometryFunction

Returns:

the name of the function

getDescription

public java.lang.String getDescription()

Description copied from interface: GeometryFunction

Gets the description of this function

Specified by:

getDescription in interface GeometryFunction

Returns:

the name of the function

getParameterNames

public java.lang.String[] getParameterNames()

Description copied from interface: GeometryFunction

Gets the parameter names for this function

Specified by:

getParameterNames in interface GeometryFunction

Returns:

the names of the function parameters

getParameterTypes

public java.lang.Class[] getParameterTypes()

Gets the types of the other function arguments, if any.

Specified by:

getParameterTypes in interface GeometryFunction

Returns:

the types

getReturnType

public java.lang.Class getReturnType()

Description copied from interface: GeometryFunction

Gets the return type of this function

Specified by:

getReturnType in interface GeometryFunction

Returns:

the type of the value returned by this function

isBinary

public boolean isBinary()

Specified by:

isBinary in interface GeometryFunction

getSignature

public java.lang.String getSignature()

Description copied from interface: GeometryFunction

Gets a string representing the signature of this function.

Specified by:

getSignature in interface GeometryFunction

Returns:

the string for the function signature

getDoubleOrNull

protected static java.lang.Double getDoubleOrNull(java.lang.Object[] args,
                                                  int index)

getIntegerOrNull

protected static java.lang.Integer getIntegerOrNull(java.lang.Object[] args,
                                                    int index)

invoke

public abstract java.lang.Object invoke(Geometry geom,
                                        java.lang.Object[] args)

Description copied from interface: GeometryFunction

Invokes this function. Note that any exceptions returned must be RuntimeExceptions.

Specified by:

invoke in interface GeometryFunction

Parameters:

geom - the target geometry

args - the other arguments to the function

Returns:

the value computed by the function

equals

public boolean equals(java.lang.Object obj)

Two functions are the same if they have the same signature (name, parameter types and return type).

Specified by:

equals in interface GeometryFunction

Overrides:

equals in class java.lang.Object

Parameters:

obj -

Returns:

true if this object is the same as the obj argument

compareTo

public int compareTo(java.lang.Object o)

Specified by:

compareTo in interface java.lang.Comparable

compareTo

private static int compareTo(java.lang.Class c1,
                             java.lang.Class c2)