org.apache.samza.sql.client.interfaces

Interface CommandHandler

All Known Implementing Classes:

CliCommandHandler

public interface CommandHandler

Handles commands of certain CommandType

Method Summary

Modifier and Type	Method and Description
boolean	handleCommand(CliCommand command) Handles the given command
void	init(CliShell shell, CliEnvironment env, org.jline.terminal.Terminal terminal, ExecutionContext exeContext) sets-up the member variables
CliCommand	parseLine(java.lang.String line) Attempts to parse the given input string line into a CliCommand of this handler's CommandType
void	printHelpMessage() Prints to terminal the help message of the commands this handler handles

Method Detail

init

void init(CliShell shell,
          CliEnvironment env,
          org.jline.terminal.Terminal terminal,
          ExecutionContext exeContext)

sets-up the member variables

Parameters:

shell: - the CliShell which uses this CommandHandler

env: - the Shell's CliEnvironment

terminal: - the Terminal to print output and messages

exeContext: - the ExecutionContext

parseLine

CliCommand parseLine(java.lang.String line)

Attempts to parse the given input string line into a CliCommand of this handler's CommandType

Parameters:

line: - input line string

Returns:

CliCommand on success, null otherwise

handleCommand

boolean handleCommand(CliCommand command)
               throws CommandHandlerException

Handles the given command

Parameters:

command: - input CliCommand to handle

Returns:

false if command is to quit, or fatal error happened that Shell should not continue running. True o.w.

Throws:

CommandHandlerException - if unrecoverable error happened

printHelpMessage

void printHelpMessage()

Prints to terminal the help message of the commands this handler handles