py4j.commands

Class ReflectionCommand

java.lang.Object

py4j.commands.AbstractCommand

py4j.commands.ReflectionCommand

All Implemented Interfaces:

Command

public class ReflectionCommand
extends AbstractCommand

The ReflectionCommand is responsible for accessing packages, classes, and static members. This is the command invoked when using the jvm property of a JavaGateway on the Python side.

Field Summary

Fields

Modifier and Type	Field and Description
static char	GET_JAVA_LANG_CLASS_SUB_COMMAND_NAME
static char	GET_MEMBER_SUB_COMMAND_NAME
static char	GET_UNKNOWN_SUB_COMMAND_NAME
static java.lang.String	REFLECTION_COMMAND_NAME
protected ReflectionEngine	rEngine

Fields inherited from class py4j.commands.AbstractCommand

commandName, connection, gateway

Constructor Summary

Constructors

Constructor and Description
ReflectionCommand()

Method Summary

Modifier and Type	Method and Description
void	execute(java.lang.String commandName, java.io.BufferedReader reader, java.io.BufferedWriter writer)
void	init(Gateway gateway, Py4JServerConnection connection) Called when a command instance is created and assigned to a connection.

Methods inherited from class py4j.commands.AbstractCommand

getArguments, getCommandName, getStringArguments, invokeMethod

Methods inherited from class java.lang.Object

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

Field Detail

GET_UNKNOWN_SUB_COMMAND_NAME

public static final char GET_UNKNOWN_SUB_COMMAND_NAME

See Also:

Constant Field Values

GET_MEMBER_SUB_COMMAND_NAME

public static final char GET_MEMBER_SUB_COMMAND_NAME

See Also:

Constant Field Values

GET_JAVA_LANG_CLASS_SUB_COMMAND_NAME

public static final char GET_JAVA_LANG_CLASS_SUB_COMMAND_NAME

See Also:

Constant Field Values

REFLECTION_COMMAND_NAME

public static final java.lang.String REFLECTION_COMMAND_NAME

See Also:

Constant Field Values

rEngine

protected ReflectionEngine rEngine

Constructor Detail

ReflectionCommand

public ReflectionCommand()

Method Detail

execute

public void execute(java.lang.String commandName,
                    java.io.BufferedReader reader,
                    java.io.BufferedWriter writer)
             throws Py4JException,
                    java.io.IOException

Specified by:

execute in interface Command

Specified by:

execute in class AbstractCommand

Parameters:

commandName - The command name that was extracted of the command.

reader - The reader from which to read the command parts. Each command part are expected to be on a separate line and readable through BufferedReader.readLine().

writer - The writer to which the return value should be written.

Throws:

Py4JException - If an error occurs while executing the command. All exceptions except IOException caused by the reader and the writer should be wrapper in a Py4JException instance.

java.io.IOException - If an error occurs while using the reader or the writer.

init

public void init(Gateway gateway,
                 Py4JServerConnection connection)

Description copied from interface: Command

Called when a command instance is created and assigned to a connection.

Specified by:

init in interface Command

Overrides:

init in class AbstractCommand

connection - the Py4JServerConnection this socket is assigned to