org.apache.tools.ant.taskdefs

## Class ExecTask

- java.lang.Object
- - org.apache.tools.ant.ProjectComponent
  - - org.apache.tools.ant.Task
    - - org.apache.tools.ant.taskdefs.ExecTask

All Implemented Interfaces:
  java.lang.Cloneable

Direct Known Subclasses:
  ExecuteOn

    public class ExecTask
    extends Task

Executes a given command if the os platform is appropriate.

Since:
  Ant 1.2

### Field Summary

Fields
`protected Commandline` `cmdl`
`protected boolean` `failOnError`
`protected boolean` `newEnvironment`
`protected Redirector` `redirector`
`protected RedirectorElement` `redirectorElement`

### Fields inherited from class org.apache.tools.ant.Task

`target, taskName, taskType, wrapper`

### Fields inherited from class org.apache.tools.ant.ProjectComponent

`description, location, project`

### Constructor Summary

Constructors
Constructor and Description
`ExecTask()` Create an instance.
`ExecTask(Task owner)` create an instance that is helping another task.

### Method Summary

Methods
`void` `addConfiguredRedirector(RedirectorElement redirectorElement)` Add a `RedirectorElement` to this task.
`void` `addEnv(Environment.Variable var)` Add an environment variable to the launched process.
`protected void` `checkConfiguration()` Has the user set all necessary attributes?
`Commandline.Argument` `createArg()` Adds a command-line argument.
`protected ExecuteStreamHandler` `createHandler()` Create the StreamHandler to use with our Execute instance.
`protected ExecuteWatchdog` `createWatchdog()` Create the Watchdog to kill a runaway process.
`void` `execute()` Do the work.
`java.lang.String` `getOs()` List of operating systems on which the command may be executed.
`java.lang.String` `getOsFamily()` Restrict this execution to a single OS Family
`boolean` `getResolveExecutable()` Indicates whether to attempt to resolve the executable to a file.
`protected boolean` `isValidOs()` Is this the OS the user wanted?
`protected void` `logFlush()` Flush the output stream - if there is one.
`protected void` `maybeSetResultPropertyValue(int result)` Helper method to set result property to the passed in value if appropriate.
`protected Execute` `prepareExec()` Create an Execute instance with the correct working directory set.
`protected java.lang.String` `resolveExecutable(java.lang.String exec, boolean mustSearchPath)` The method attempts to figure out where the executable is so that we can feed the full path.
`protected void` `runExec(Execute exe)` Run the command using the given Execute instance.
`protected void` `runExecute(Execute exe)` A Utility method for this classes and subclasses to run an Execute instance (an external command).
`void` `setAppend(boolean append)` Set whether output should be appended to or overwrite an existing file.
`void` `setCommand(Commandline cmdl)` Sets a command line.
`void` `setDir(java.io.File d)` Set the working directory of the process.
`void` `setError(java.io.File error)` Set the File to which the error stream of the process should be redirected.
`void` `setErrorProperty(java.lang.String errorProperty)` Sets the name of the property whose value should be set to the error of the process.
`void` `setExecutable(java.lang.String value)` Set the name of the executable program.
`void` `setFailIfExecutionFails(boolean flag)` Set whether to stop the build if program cannot be started.
`void` `setFailonerror(boolean fail)` Fail if the command exits with a non-zero return code.
`void` `setInput(java.io.File input)` Set the input file to use for the task.
`void` `setInputString(java.lang.String inputString)` Set the string to use as input.
`void` `setLogError(boolean logError)` Controls whether error output of exec is logged.
`void` `setNewenvironment(boolean newenv)` Do not propagate old environment when new environment variables are specified.
`void` `setOs(java.lang.String os)` List of operating systems on which the command may be executed.
`void` `setOsFamily(java.lang.String osFamily)` Restrict this execution to a single OS Family
`void` `setOutput(java.io.File out)` File the output of the process is redirected to.
`void` `setOutputproperty(java.lang.String outputProp)` Sets the property name whose value should be set to the output of the process.
`void` `setResolveExecutable(boolean resolveExecutable)` Set whether to attempt to resolve the executable to a file.
`void` `setResultProperty(java.lang.String resultProperty)` Sets the name of a property in which the return code of the command should be stored.
`void` `setSearchPath(boolean searchPath)` Set whether to search nested, then system PATH environment variables for the executable.
`void` `setSpawn(boolean spawn)` Set whether or not you want the process to be spawned.
`void` `setTimeout(java.lang.Integer value)` Set the timeout in milliseconds after which the process will be killed.
`void` `setTimeout(java.lang.Long value)` Set the timeout in milliseconds after which the process will be killed.
`protected void` `setupRedirector()` Set up properties on the redirector that we needed to store locally.
`void` `setVMLauncher(boolean vmLauncher)` Set whether to launch new process with VM, otherwise use the OS's shell.

### Methods inherited from class org.apache.tools.ant.Task

`bindToOwner, getOwningTarget, getRuntimeConfigurableWrapper, getTaskName, getTaskType, getWrapper, handleErrorFlush, handleErrorOutput, handleFlush, handleInput, handleOutput, init, isInvalid, log, log, log, log, maybeConfigure, perform, reconfigure, setOwningTarget, setRuntimeConfigurableWrapper, setTaskName, setTaskType`

### Methods inherited from class org.apache.tools.ant.ProjectComponent

`clone, getDescription, getLocation, getProject, setDescription, setLocation, setProject`

### Methods inherited from class java.lang.Object

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

### Field Detail

#### failOnError

    protected boolean failOnError

#### newEnvironment

    protected boolean newEnvironment

#### cmdl

    protected Commandline cmdl

#### redirector

    protected Redirector redirector

#### redirectorElement

    protected RedirectorElement redirectorElement

### Constructor Detail

#### ExecTask

    public ExecTask()

Create an instance. Needs to be configured by binding to a project.

#### ExecTask

    public ExecTask(Task owner)

create an instance that is helping another task. Project, OwningTarget, TaskName and description are all pulled out

Parameters:
  `owner` - task that we belong to

### Method Detail

#### setSpawn

    public void setSpawn(boolean spawn)

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

Parameters:
  `spawn` - if true you do not want Ant to wait for the end of the process.
Since:
  Ant 1.6

#### setTimeout

    public void setTimeout(java.lang.Long value)

Set the timeout in milliseconds after which the process will be killed.

Parameters:
  `value` - timeout in milliseconds.
Since:
  Ant 1.5

#### setTimeout

    public void setTimeout(java.lang.Integer value)

Set the timeout in milliseconds after which the process will be killed.

Parameters:
  `value` - timeout in milliseconds.

#### setExecutable

    public void setExecutable(java.lang.String value)

Set the name of the executable program.

Parameters:
  `value` - the name of the executable program.

#### setDir

    public void setDir(java.io.File d)

Set the working directory of the process.

Parameters:
  `d` - the working directory of the process.

#### setOs

    public void setOs(java.lang.String os)

List of operating systems on which the command may be executed.

Parameters:
  `os` - list of operating systems on which the command may be executed.

#### getOs

    public final java.lang.String getOs()

List of operating systems on which the command may be executed.

Since:
  Ant 1.8.0

#### setCommand

    public void setCommand(Commandline cmdl)

Sets a command line.

Parameters:
  `cmdl` - command line.

#### setOutput

    public void setOutput(java.io.File out)

File the output of the process is redirected to. If error is not redirected, it too will appear in the output.

Parameters:
  `out` - name of a file to which output should be sent.

#### setInput

    public void setInput(java.io.File input)

Set the input file to use for the task.

Parameters:
  `input` - name of a file from which to get input.

#### setInputString

    public void setInputString(java.lang.String inputString)

Set the string to use as input.

Parameters:
  `inputString` - the string which is used as the input source.

#### setLogError

    public void setLogError(boolean logError)

Controls whether error output of exec is logged. This is only useful when output is being redirected and error output is desired in the Ant log.

Parameters:
  `logError` - set to true to log error output in the normal ant log.

#### setError

    public void setError(java.io.File error)

Set the File to which the error stream of the process should be redirected.

Parameters:
  `error` - a file to which stderr should be sent.
Since:
  Ant 1.6

#### setOutputproperty

    public void setOutputproperty(java.lang.String outputProp)

Sets the property name whose value should be set to the output of the process.

Parameters:
  `outputProp` - name of property.

#### setErrorProperty

    public void setErrorProperty(java.lang.String errorProperty)

Sets the name of the property whose value should be set to the error of the process.

Parameters:
  `errorProperty` - name of property.
Since:
  Ant 1.6

#### setFailonerror

    public void setFailonerror(boolean fail)

Fail if the command exits with a non-zero return code.

Parameters:
  `fail` - if true fail the command on non-zero return code.

#### setNewenvironment

    public void setNewenvironment(boolean newenv)

Do not propagate old environment when new environment variables are specified.

Parameters:
  `newenv` - if true, do not propagate old environment when new environment variables are specified.

#### setResolveExecutable

    public void setResolveExecutable(boolean resolveExecutable)

Set whether to attempt to resolve the executable to a file.

Parameters:
  `resolveExecutable` - if true, attempt to resolve the path of the executable.

#### setSearchPath

    public void setSearchPath(boolean searchPath)

Set whether to search nested, then system PATH environment variables for the executable.

Parameters:
  `searchPath` - if true, search PATHs.

#### getResolveExecutable

    public boolean getResolveExecutable()

Indicates whether to attempt to resolve the executable to a file.

Returns:
  the resolveExecutable flag
Since:
  Ant 1.6

#### addEnv

    public void addEnv(Environment.Variable var)

Add an environment variable to the launched process.

Parameters:
  `var` - new environment variable.

#### createArg

    public Commandline.Argument createArg()

Adds a command-line argument.

Returns:
  new command line argument created.

#### setResultProperty

    public void setResultProperty(java.lang.String resultProperty)

Sets the name of a property in which the return code of the command should be stored. Only of interest if failonerror=false.

Parameters:
  `resultProperty` - name of property.
Since:
  Ant 1.5

#### maybeSetResultPropertyValue

    protected void maybeSetResultPropertyValue(int result)

Helper method to set result property to the passed in value if appropriate.

Parameters:
  `result` - value desired for the result property value.

#### setFailIfExecutionFails

    public void setFailIfExecutionFails(boolean flag)

Set whether to stop the build if program cannot be started. Defaults to true.

Parameters:
  `flag` - stop the build if program cannot be started.
Since:
  Ant 1.5

#### setAppend

    public void setAppend(boolean append)

Set whether output should be appended to or overwrite an existing file. Defaults to false.

Parameters:
  `append` - if true append is desired.
Since:
  1.30, Ant 1.5

#### addConfiguredRedirector

    public void addConfiguredRedirector(RedirectorElement redirectorElement)

Add a `RedirectorElement` to this task.

Parameters:
  `redirectorElement` - `RedirectorElement`.
Since:
  Ant 1.6.2

#### setOsFamily

    public void setOsFamily(java.lang.String osFamily)

Restrict this execution to a single OS Family

Parameters:
  `osFamily` - the family to restrict to.

#### getOsFamily

    public final java.lang.String getOsFamily()

Restrict this execution to a single OS Family

Since:
  Ant 1.8.0

#### resolveExecutable

    protected java.lang.String resolveExecutable(java.lang.String exec,
                                     boolean mustSearchPath)

The method attempts to figure out where the executable is so that we can feed the full path. We first try basedir, then the exec dir, and then fallback to the straight executable name (i.e. on the path).

Parameters:
  `exec` - the name of the executable.
  `mustSearchPath` - if true, the executable will be looked up in the PATH environment and the absolute path is returned.
Returns:
  the executable as a full path if it can be determined.
Since:
  Ant 1.6

#### execute

    public void execute()
                 throws BuildException

Do the work.

Overrides:
  `execute` in class `Task`
Throws:
  `BuildException` - in a number of circumstances:
  - if failIfExecFails is set to true and the process cannot be started
  - the java13command launcher can send build exceptions
  - this list is not exhaustive or limitative

#### checkConfiguration

    protected void checkConfiguration()
                               throws BuildException

Has the user set all necessary attributes?

Throws:
  `BuildException` - if there are missing required parameters.

#### setupRedirector

    protected void setupRedirector()

Set up properties on the redirector that we needed to store locally.

#### isValidOs

    protected boolean isValidOs()

Is this the OS the user wanted?

Returns:
  boolean.
  - `true` if the os and osfamily attributes are null.
  - `true` if osfamily is set, and the os family and must match that of the current OS, according to the logic of `Os.isOs(String, String, String, String)`, and the result of the `os` attribute must also evaluate true.
  - `true` if os is set, and the system.property os.name is found in the os attribute,
  - `false` otherwise.

#### setVMLauncher

    public void setVMLauncher(boolean vmLauncher)

Set whether to launch new process with VM, otherwise use the OS's shell. Default value is true.

Parameters:
  `vmLauncher` - true if we want to launch new process with VM, false if we want to use the OS's shell.

#### prepareExec

    protected Execute prepareExec()
                           throws BuildException

Create an Execute instance with the correct working directory set.

Returns:
  an instance of the Execute class.
Throws:
  `BuildException` - under unknown circumstances.

#### runExecute

    protected final void runExecute(Execute exe)
                             throws java.io.IOException

A Utility method for this classes and subclasses to run an Execute instance (an external command).

Parameters:
  `exe` - instance of the execute class.
Throws:
  `java.io.IOException` - in case of problem to attach to the stdin/stdout/stderr streams of the process.

#### runExec

    protected void runExec(Execute exe)
                    throws BuildException

Run the command using the given Execute instance. This may be overridden by subclasses.

Parameters:
  `exe` - instance of Execute to run.
Throws:
  `BuildException` - if the new process could not be started only if failIfExecFails is set to true (the default).

#### createHandler

    protected ExecuteStreamHandler createHandler()
                                          throws BuildException

Create the StreamHandler to use with our Execute instance.

Returns:
  instance of ExecuteStreamHandler.
Throws:
  `BuildException` - under unknown circumstances.

#### createWatchdog

    protected ExecuteWatchdog createWatchdog()
                                      throws BuildException

Create the Watchdog to kill a runaway process.

Returns:
  instance of ExecuteWatchdog.
Throws:
  `BuildException` - under unknown circumstances.

#### logFlush

    protected void logFlush()

Flush the output stream - if there is one.