org.apache.tools.ant

Class Task

java.lang.Object

org.apache.tools.ant.ProjectComponent

org.apache.tools.ant.Task

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

AbstractCvsTask, AbstractJarSignerTask, Ant, Antlib, AntlibDefinition, AntStructure, AntVersion, AugmentReference, Available, Basename, BindTargets, BorlandGenerateClient, BuildNumber, CallTarget, Classloader, ClearCase, CloseResources, CommandLauncherTask, Concat, Continuus, Copy, CVSPass, DefaultExcludes, DiagnosticsTask, Dirname, DispatchTask, Echo, EchoProperties, EmailTask, ExecTask, Exit, Expand, Filter, Funtest, GenerateKey, Get, HostInfo, ImportTask, Input, IPlanetEjbcTask, JarLibAvailableTask, JarLibDisplayTask, JarLibManifestTask, JarLibResolveTask, Java, JavaCC, Javadoc, Javah, JDBCTask, JJDoc, JJTree, Length, LoadProperties, LoadResource, Local, MacroInstance, MakeUrl, ManifestClassPath, ManifestTask, MatchingTask, Mkdir, MSVSS, Nice, Pack, Parallel, Patch, PathConvert, ProjectHelperTask, Property, PropertyFile, PropertyHelperTask, Pvcs, Recorder, ReplaceRegExp, ResourceCount, Retry, Rpm, Script, ScriptDefBase, Sequential, ServerDeploy, SetProxy, Sleep, SOS, StartJobTask, SubAnt, Sync, TaskAdapter, TempFile, Touch, Truncate, Tstamp, UnknownElement, Unpack, UpToDate, WhichResource, XmlProperty, XMLValidateTask

public abstract class Task
extends ProjectComponent

Base class for all tasks. Use Project.createTask to create a new task instance rather than using this class directly for construction.

See Also:

Project.createTask(java.lang.String)

Constructor Summary

Constructors

Constructor and Description
Task() Sole constructor.

Method Summary

Modifier and Type	Method and Description
void	bindToOwner(Task owner) Bind a task to another; use this when configuring a newly created task to do work on behalf of another.
void	execute() Called by the project to let the task do its work.
Target	getOwningTarget() Returns the container target of this task.
RuntimeConfigurable	getRuntimeConfigurableWrapper() Returns the wrapper used for runtime configuration.
String	getTaskName() Returns the name to use in logging messages.
String	getTaskType() Return the type of task.
protected RuntimeConfigurable	getWrapper() Return the runtime configurable structure for this task.
protected void	handleErrorFlush(String output) Handles an error line by logging it with the WARN priority.
protected void	handleErrorOutput(String output) Handles an error output by logging it with the WARN priority.
protected void	handleFlush(String output) Handles output by logging it with the INFO priority.
protected int	handleInput(byte[] buffer, int offset, int length) Handle an input request by this task.
protected void	handleOutput(String output) Handles output by logging it with the INFO priority.
void	init() Called by the project to let the task initialize properly.
protected boolean	isInvalid() Has this task been marked invalid?
void	log(String msg) Logs a message with the default (INFO) priority.
void	log(String msg, int msgLevel) Logs a message with the given priority.
void	log(String msg, Throwable t, int msgLevel) Logs a message with the given priority.
void	log(Throwable t, int msgLevel) Logs a message with the given priority.
void	maybeConfigure() Configures this task - if it hasn't been done already.
void	perform() Performs this task if it's still valid, or gets a replacement version and performs that otherwise.
void	reconfigure() Force the task to be reconfigured from its RuntimeConfigurable.
void	setOwningTarget(Target target) Sets the target container of this task.
void	setRuntimeConfigurableWrapper(RuntimeConfigurable wrapper) Sets the wrapper to be used for runtime configuration.
void	setTaskName(String name) Sets the name to use in logging messages.
void	setTaskType(String type) Sets the name with which the task has been invoked.

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

Task

public Task()

Sole constructor.

Method Detail

bindToOwner

public final void bindToOwner(Task owner)

Bind a task to another; use this when configuring a newly created task to do work on behalf of another. Project, OwningTarget, TaskName, Location and Description are all copied Important: this method does not call init(). If you are creating a task to delegate work to, call init() to initialize it.

Parameters:

owner - owning target

Since:

Ant1.7

execute

public void execute()
             throws BuildException

Called by the project to let the task do its work. This method may be called more than once, if the task is invoked more than once. For example, if target1 and target2 both depend on target3, then running "ant target1 target2" will run all tasks in target3 twice.

Throws:

BuildException - if something goes wrong with the build.

getOwningTarget

public Target getOwningTarget()

Returns the container target of this task.

Returns:

The target containing this task, or null if this task is a top-level task.

getRuntimeConfigurableWrapper

public RuntimeConfigurable getRuntimeConfigurableWrapper()

Returns the wrapper used for runtime configuration.

Returns:

the wrapper used for runtime configuration. This method will generate a new wrapper (and cache it) if one isn't set already.

getTaskName

public String getTaskName()

Returns the name to use in logging messages.

Returns:

the name to use in logging messages.

getTaskType

public String getTaskType()

Return the type of task.

Returns:

the type of task.

getWrapper

protected RuntimeConfigurable getWrapper()

Return the runtime configurable structure for this task.

Returns:

the runtime structure for this task.

handleErrorFlush

protected void handleErrorFlush(String output)

Handles an error line by logging it with the WARN priority.

Parameters:

output - The error output to log. Should not be null.

Since:

Ant 1.5.2

handleErrorOutput

protected void handleErrorOutput(String output)

Handles an error output by logging it with the WARN priority.

Parameters:

output - The error output to log. Should not be null.

handleFlush

protected void handleFlush(String output)

Handles output by logging it with the INFO priority.

Parameters:

output - The output to log. Should not be null.

Since:

Ant 1.5.2

handleInput

protected int handleInput(byte[] buffer,
                          int offset,
                          int length)
                   throws IOException

Handle an input request by this task.

Parameters:

buffer - the buffer into which data is to be read.

offset - the offset into the buffer at which data is stored.

length - the amount of data to read.

Returns:

the number of bytes read.

Throws:

IOException - if the data cannot be read.

Since:

Ant 1.6

handleOutput

protected void handleOutput(String output)

Handles output by logging it with the INFO priority.

Parameters:

output - The output to log. Should not be null.

init

public void init()
          throws BuildException

Called by the project to let the task initialize properly. The default implementation is a no-op.

Throws:

BuildException - if something goes wrong with the build

isInvalid

protected final boolean isInvalid()

Has this task been marked invalid?

Returns:

true if this task is no longer valid. A new task should be configured in this case.

Since:

Ant 1.5

log

public void log(String msg)

Logs a message with the default (INFO) priority.

Overrides:

log in class ProjectComponent

Parameters:

msg - The message to be logged. Should not be null.

log

public void log(String msg,
                int msgLevel)

Logs a message with the given priority. This delegates the actual logging to the project.

Overrides:

log in class ProjectComponent

Parameters:

msg - The message to be logged. Should not be null.

msgLevel - The message priority at which this message is to be logged.

log

public void log(String msg,
                Throwable t,
                int msgLevel)

Logs a message with the given priority. This delegates the actual logging to the project.

Parameters:

msg - The message to be logged. Should not be null.

t - The exception to be logged. May be null.

msgLevel - The message priority at which this message is to be logged.

Since:

1.7

log

public void log(Throwable t,
                int msgLevel)

Logs a message with the given priority. This delegates the actual logging to the project.

Parameters:

t - The exception to be logged. Should not be null.

msgLevel - The message priority at which this message is to be logged.

Since:

1.7

maybeConfigure

public void maybeConfigure()
                    throws BuildException

Configures this task - if it hasn't been done already. If the task has been invalidated, it is replaced with an UnknownElement task which uses the new definition in the project.

Throws:

BuildException - if the task cannot be configured.

perform

public final void perform()

Performs this task if it's still valid, or gets a replacement version and performs that otherwise. Performing a task consists of firing a task started event, configuring the task, executing it, and then firing task finished event. If a runtime exception is thrown, the task finished event is still fired, but with the exception as the cause.

reconfigure

public void reconfigure()

Force the task to be reconfigured from its RuntimeConfigurable.

setOwningTarget

public void setOwningTarget(Target target)

Sets the target container of this task.

Parameters:

target - Target in whose scope this task belongs. May be null, indicating a top-level task.

setRuntimeConfigurableWrapper

public void setRuntimeConfigurableWrapper(RuntimeConfigurable wrapper)

Sets the wrapper to be used for runtime configuration. This method should be used only by the ProjectHelper and Ant internals. It is public to allow helper plugins to operate on tasks, normal tasks should never use it.

Parameters:

wrapper - The wrapper to be used for runtime configuration. May be null, in which case the next call to getRuntimeConfigurableWrapper will generate a new wrapper.

setTaskName

public void setTaskName(String name)

Sets the name to use in logging messages.

Parameters:

name - The name to use in logging messages. Should not be null.

setTaskType

public void setTaskType(String type)

Sets the name with which the task has been invoked.

Parameters:

type - The name the task has been invoked as. Should not be null.