py4j.reflection

Class MethodInvoker

java.lang.Object

py4j.reflection.MethodInvoker

public class MethodInvoker
extends Object

A MethodInvoker translates a call made in a Python Program into a call to a Java method.

A MethodInvoker is tailored to a particular set of actual parameters and indicates how far the calling context is from the method signature.

For example, a call to method1(String) from Python can be translated to a call to method1(char) in Java, with a cost of 1.

Author:

Barthelemy Dagenais

Field Summary

Fields

Modifier and Type	Field and Description
static MethodInvoker	INVALID_INVOKER
static int	INVALID_INVOKER_COST
static int	MAX_DISTANCE

Constructor Summary

Constructors

Constructor and Description
MethodInvoker(Constructor<?> constructor, TypeConverter[] converters, int cost)
MethodInvoker(Method method, TypeConverter[] converters, int cost)

Method Summary

Modifier and Type	Method and Description
static int	buildConverters(List<TypeConverter> converters, Class<?>[] parameters, Class<?>[] arguments) Builds a list of converters used to convert the arguments into the parameters.
static MethodInvoker	buildInvoker(Constructor<?> constructor, Class<?>[] arguments)
static MethodInvoker	buildInvoker(Method method, Class<?>[] arguments)
Constructor<?>	getConstructor()
List<TypeConverter>	getConverters()
int	getCost()
Method	getMethod()
Object	invoke(Object obj, Object[] arguments)
boolean	isVoid()

Methods inherited from class java.lang.Object

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

Field Detail

INVALID_INVOKER_COST

public static final int INVALID_INVOKER_COST

See Also:

Constant Field Values

MAX_DISTANCE

public static final int MAX_DISTANCE

See Also:

Constant Field Values

INVALID_INVOKER

public static final MethodInvoker INVALID_INVOKER

Constructor Detail

MethodInvoker

public MethodInvoker(Constructor<?> constructor,
                     TypeConverter[] converters,
                     int cost)

MethodInvoker

public MethodInvoker(Method method,
                     TypeConverter[] converters,
                     int cost)

Method Detail

buildConverters

public static int buildConverters(List<TypeConverter> converters,
                                  Class<?>[] parameters,
                                  Class<?>[] arguments)

Builds a list of converters used to convert the arguments into the parameters.

Parameters:

converters -

parameters -

arguments -

Returns:

buildInvoker

public static MethodInvoker buildInvoker(Constructor<?> constructor,
                                         Class<?>[] arguments)

buildInvoker

public static MethodInvoker buildInvoker(Method method,
                                         Class<?>[] arguments)

getConstructor

public Constructor<?> getConstructor()

getConverters

public List<TypeConverter> getConverters()

getCost

public int getCost()

getMethod

public Method getMethod()

invoke

public Object invoke(Object obj,
                     Object[] arguments)

isVoid

public boolean isVoid()