Package org.apache.tools.ant.taskdefs

Class Execute

java.lang.Object

org.apache.tools.ant.taskdefs.Execute

public class Execute
extends Object

Runs an external program.

Since:

Ant 1.2

Field Summary

Fields

Modifier and Type	Field	Description
static final int	INVALID	Invalid exit code.

Constructor Summary

Constructors

Constructor	Description
Execute()	Creates a new execute object using PumpStreamHandler for stream handling.
Execute(ExecuteStreamHandler streamHandler)	Creates a new execute object.
Execute(ExecuteStreamHandler streamHandler, ExecuteWatchdog watchdog)	Creates a new execute object.

Method Summary

Modifier and Type	Method	Description
static void	closeStreams(Process process)	Close the streams belonging to the given Process.
int	execute()	Runs a process defined by the command line and returns its exit status.
String[]	getCommandline()	Returns the commandline used to create a subprocess.
String[]	getEnvironment()	Returns the environment used to create a subprocess.
static Map<String,String>	getEnvironmentVariables()	Find the list of environment variables for this process.
int	getExitValue()	Query the exit value of the process.
static Vector<String>	getProcEnvironment()	Deprecated. use #getEnvironmentVariables instead
File	getWorkingDirectory()	Return the working directory.
boolean	isFailure()	Did this execute return in a failure.
static boolean	isFailure(int exitValue)	Checks whether exitValue signals a failure on the current system (OS specific).
boolean	killedProcess()	Test for an untimely death of the process.
static Process	launch(Project project, String[] command, String[] env, File dir, boolean useVM)	Creates a process that runs a command.
static void	runCommand(Task task, String... cmdline)	A utility method that runs an external command.
void	setAntRun(Project project)	Set the name of the antRun script using the project's value.
void	setCommandline(String[] commandline)	Sets the commandline of the subprocess to launch.
void	setEnvironment(String[] env)	Sets the environment variables for the subprocess to launch.
protected void	setExitValue(int value)	Set the exit value.
void	setNewenvironment(boolean newenv)	Set whether to propagate the default environment or not.
void	setSpawn(boolean spawn)	Deprecated.
void	setStreamHandler(ExecuteStreamHandler streamHandler)	Set the stream handler to use.
void	setVMLauncher(boolean useVMLauncher)	Launch this execution through the VM, where possible, rather than through the OS's shell.
void	setWorkingDirectory(File wd)	Sets the working directory of the process to execute.
void	spawn()	Starts a process defined by the command line.
static String	toString(ByteArrayOutputStream bos)	ByteArrayOutputStream#toString doesn't seem to work reliably on OS/390, at least not the way we use it in the execution context.
protected void	waitFor(Process process)	Wait for a given process.

Methods inherited from class java.lang.Object

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

Field Details

INVALID

public static final int INVALID

Invalid exit code. set to Integer.MAX_VALUE

See Also:

• Constant Field Values

Constructor Details

Execute

public Execute()

Creates a new execute object using PumpStreamHandler for stream handling.

Execute

public Execute(ExecuteStreamHandler streamHandler)

Creates a new execute object.

Parameters:

streamHandler - the stream handler used to handle the input and output streams of the subprocess.

Execute

public Execute(ExecuteStreamHandler streamHandler,
 ExecuteWatchdog watchdog)

Creates a new execute object.

Parameters:

streamHandler - the stream handler used to handle the input and output streams of the subprocess.

watchdog - a watchdog for the subprocess or null to disable a timeout for the subprocess.

Method Details

setSpawn

@Deprecated
public void setSpawn(boolean spawn)

Deprecated.

Set whether or not you want the process to be spawned. Default is not spawned.

Parameters:

spawn - if true you do not want Ant to wait for the end of the process. Has no influence in here, the calling task contains and acts accordingly

Since:

Ant 1.6

getEnvironmentVariables

public static Map<String,String> getEnvironmentVariables()

Find the list of environment variables for this process.

Returns:

a map containing the environment variables.

Since:

Ant 1.8.2

getProcEnvironment

@Deprecated
public static Vector<String> getProcEnvironment()

Deprecated.

use #getEnvironmentVariables instead

Find the list of environment variables for this process.

Returns:

a vector containing the environment variables. The vector elements are strings formatted like variable = value.

toString

public static String toString(ByteArrayOutputStream bos)

ByteArrayOutputStream#toString doesn't seem to work reliably on OS/390, at least not the way we use it in the execution context.

Parameters:

bos - the output stream that one wants to read.

Returns:

the output stream as a string, read with special encodings in the case of z/os and os/400.

Since:

Ant 1.5

setStreamHandler

public void setStreamHandler(ExecuteStreamHandler streamHandler)

Set the stream handler to use.

Parameters:

streamHandler - ExecuteStreamHandler.

Since:

Ant 1.6

getCommandline

public String[] getCommandline()

Returns the commandline used to create a subprocess.

Returns:

the commandline used to create a subprocess.

setCommandline

public void setCommandline(String[] commandline)

Sets the commandline of the subprocess to launch.

Parameters:

commandline - the commandline of the subprocess to launch.

setNewenvironment

public void setNewenvironment(boolean newenv)

Set whether to propagate the default environment or not.

Parameters:

newenv - whether to propagate the process environment.

getEnvironment

public String[] getEnvironment()

Returns the environment used to create a subprocess.

Returns:

the environment used to create a subprocess.

setEnvironment

public void setEnvironment(String[] env)

Sets the environment variables for the subprocess to launch.

Parameters:

env - array of Strings, each element of which has an environment variable settings in format key=value.

setWorkingDirectory

public void setWorkingDirectory(File wd)

Sets the working directory of the process to execute.

This is emulated using the antRun scripts unless the OS is Windows NT in which case a cmd.exe is spawned, or MRJ and setting user.dir works, or JDK 1.3 and there is official support in java.lang.Runtime.

Parameters:

wd - the working directory of the process.

getWorkingDirectory

public File getWorkingDirectory()

Return the working directory.

Returns:

the directory as a File.

Since:

Ant 1.7

setAntRun

public void setAntRun(Project project)
               throws BuildException

Set the name of the antRun script using the project's value.

Parameters:

project - the current project.

Throws:

BuildException - not clear when it is going to throw an exception, but it is the method's signature.

setVMLauncher

public void setVMLauncher(boolean useVMLauncher)

Launch this execution through the VM, where possible, rather than through the OS's shell. In some cases and operating systems using the shell will allow the shell to perform additional processing such as associating an executable with a script, etc.

Parameters:

useVMLauncher - true if exec should launch through the VM, false if the shell should be used to launch the command.

launch

public static Process launch(Project project,
 String[] command,
 String[] env,
 File dir,
 boolean useVM)
                      throws IOException

Creates a process that runs a command.

Parameters:

project - the Project, only used for logging purposes, may be null.

command - the command to run.

env - the environment for the command.

dir - the working directory for the command.

useVM - use the built-in exec command for JDK 1.3 if available.

Returns:

the process started.

Throws:

IOException - forwarded from the particular launcher used.

Since:

Ant 1.5

execute

public int execute()
            throws IOException

Runs a process defined by the command line and returns its exit status.

Returns:

the exit status of the subprocess or INVALID.

Throws:

IOException - The exception is thrown, if launching of the subprocess failed.

spawn

public void spawn()
           throws IOException

Starts a process defined by the command line. Ant will not wait for this process, nor log its output.

Throws:

IOException - The exception is thrown, if launching of the subprocess failed.

Since:

Ant 1.6

waitFor

protected void waitFor(Process process)

Wait for a given process.

Parameters:

process - the process one wants to wait for.

setExitValue

protected void setExitValue(int value)

Set the exit value.

Parameters:

value - exit value of the process.

getExitValue

public int getExitValue()

Query the exit value of the process.

Returns:

the exit value or Execute.INVALID if no exit value has been received.

isFailure

public static boolean isFailure(int exitValue)

Checks whether exitValue signals a failure on the current system (OS specific).

Note that this method relies on the conventions of the OS, it will return false results if the application you are running doesn't follow these conventions. One notable exception is the Java VM provided by HP for OpenVMS - it will return 0 if successful (like on any other platform), but this signals a failure on OpenVMS. So if you execute a new Java VM on OpenVMS, you cannot trust this method.

Parameters:

exitValue - the exit value (return code) to be checked.

Returns:

true if exitValue signals a failure.

isFailure

public boolean isFailure()

Did this execute return in a failure.

Returns:

true if and only if the exit code is interpreted as a failure

Since:

Ant1.7

See Also:

• isFailure(int)

killedProcess

public boolean killedProcess()

Test for an untimely death of the process.

Returns:

true if a watchdog had to kill the process.

Since:

Ant 1.5

runCommand

public static void runCommand(Task task,
 String... cmdline)
                       throws BuildException

A utility method that runs an external command. Writes the output and error streams of the command to the project log.

Parameters:

task - The task that the command is part of. Used for logging

cmdline - The command to execute.

Throws:

BuildException - if the command does not exit successfully.

closeStreams

public static void closeStreams(Process process)

Close the streams belonging to the given Process.

Parameters:

process - the Process.