com.google.enterprise.adaptor.prebuilt

Class Command

java.lang.Object

com.google.enterprise.adaptor.prebuilt.Command

public class Command
extends Object

Exec helper that allows easy handling of stdin, stdout, and stderr. Normally you have to worry about deadlock when dealing with those streams (as mentioned briefly in Process), so this class handles that for you.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Command.Result Result data from an invocation

Method Summary

Modifier and Type	Method and Description
static Command.Result	exec(String[] command) Same as exec(command, null, new byte[0]).
static Command.Result	exec(String[] command, byte[] stdin) Same as exec(command, null, stdin).
static Command.Result	exec(String[] command, File workingDir) Same as exec(command, workingDir, new byte[0]).
static Command.Result	exec(String[] command, File workingDir, byte[] stdin) Create process command starting in the workingDir and providing stdin as input.

Methods inherited from class java.lang.Object

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

Method Detail

exec

public static Command.Result exec(String[] command)
                           throws IOException,
                                  InterruptedException

Same as exec(command, null, new byte[0]).

Parameters:

command - command

Returns:

result

Throws:

IOException - if creating process fails

InterruptedException - if interrupted

exec

public static Command.Result exec(String[] command,
                                  File workingDir)
                           throws IOException,
                                  InterruptedException

Same as exec(command, workingDir, new byte[0]).

Parameters:

command - command

workingDir - workingDir

Returns:

result

Throws:

IOException - if creating process fails

InterruptedException - if interrupted

See Also:

exec(String[], File, byte[])

exec

public static Command.Result exec(String[] command,
                                  byte[] stdin)
                           throws IOException,
                                  InterruptedException

Same as exec(command, null, stdin).

Parameters:

command - command

stdin - stdin

Returns:

result

Throws:

IOException - if creating process fails

InterruptedException - if interrupted

See Also:

exec(String[], File, byte[])

exec

public static Command.Result exec(String[] command,
                                  File workingDir,
                                  byte[] stdin)
                           throws IOException,
                                  InterruptedException

Create process command starting in the workingDir and providing stdin as input. This method blocks until the process exits. Stdout and stderr are available via Command.Result.getStdout() and Command.Result.getStderr(). Before using them, however, you should generally make sure that the process exited with a return code of zero, as other return codes typically indicate an error.

Parameters:

command - command

workingDir - workingDir

stdin - stdin

Returns:

result

Throws:

IOException - if creating process fails

InterruptedException - if interrupted