Method Detail

• acquireValue

  void acquireValue(Parameter par)
             throws TaskException

  Obtains a legal value for a given parameter from the environment and sets the parameter's value accordingly.

  This environment should obtain a value for the parameter par in whatever way it sees fit, and must then call par's Parameter.setValueFromString(uk.ac.starlink.task.Environment, java.lang.String) method so that the parameter knows what its new value is. If the setValueFromString call throws a ParameterValueException the environment may try to get another value (for instance by re-prompting the user) or may give up and re-throw the exception.

  Parameters:

  par - the Parameter whose value is to be obtained and set

  Throws:

  TaskException

• clearValue

  void clearValue(Parameter par)

  Clears a value for a given parameter.

  Parameters:

  par - the Parameter whose value is to be cleared

• getNames

  java.lang.String[] getNames()

  Returns an array of parameter names which have been specified. The result is not necessarily an exhaustive list of all parameters whose values can be retrieved from this environment, since an interactive environment may be able to prompt the user for values, but it can give a list of values provided explicitly or without interactive prompts.

  Returns:

  array of names of known supplied parameters

• getOutputStream

  java.io.PrintStream getOutputStream()

  Returns an output stream into which text output from a task can be written. This would correspond to standard output for a terminal-based application.

  Returns:

  a stream for text output

• getErrorStream

  java.io.PrintStream getErrorStream()

  Returns an output stream into which error or logging output from a task can be written. This would correspodnd to standard error for a terminal-based application.

  Returns:

  a stream for error output