org.locationtech.jtstest.geomfunction

Class BaseGeometryFunction

java.lang.Object

org.locationtech.jtstest.geomfunction.BaseGeometryFunction

All Implemented Interfaces:

Comparable, GeometryFunction

Direct Known Subclasses:

StaticMethodGeometryFunction

public abstract class BaseGeometryFunction
extends Object
implements GeometryFunction, Comparable

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

Author:

Martin Davis

Field Summary

Fields

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

Constructor Summary

Constructors

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

Method Summary

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

name

protected String name

description

protected String description

parameterNames

protected String[] parameterNames

parameterTypes

protected Class[] parameterTypes

returnType

protected Class returnType

Constructor Detail

BaseGeometryFunction

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

BaseGeometryFunction

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

Method Detail

isBinaryGeomFunction

public static boolean isBinaryGeomFunction(GeometryFunction func)

firstScalarParamIndex

public static int firstScalarParamIndex(GeometryFunction func)

getCategory

public 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 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 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 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 Class[] getParameterTypes()

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

Specified by:

getParameterTypes in interface GeometryFunction

Returns:

the types

getReturnType

public 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 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 Double getDoubleOrNull(Object[] args,
                                        int index)

getIntegerOrNull

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

invoke

public abstract Object invoke(Geometry geom,
                              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(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 Object

Parameters:

obj -

Returns:

true if this object is the same as the obj argument

compareTo

public int compareTo(Object o)

Specified by:

compareTo in interface Comparable