StepFactory (Starjava TTOOLS API)

java.lang.Object
- uk.ac.starlink.ttools.filter.StepFactory

```
public class StepFactory
extends java.lang.Object
```
Factory which can create ProcessingStep objects from strings which represent the filter specifications.
This is currently a singleton class.

Since:

16 Aug 2005

Author:

Mark Taylor (Starlink)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`ProcessingStep`	`createStep(java.lang.String line)`	Creates a processing filter from a line of text.
`ProcessingStep[]`	`createSteps(java.lang.String text)`	Creates an array of processing filters from an input string.
`uk.ac.starlink.util.ObjectFactory<ProcessingFilter>`	`getFilterFactory()`	Returns the factory which can create filters from their nicknames.
`static StepFactory`	`getInstance()`	Returns the singleton instance of this class.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - getFilterFactory
```
public uk.ac.starlink.util.ObjectFactory<ProcessingFilter> getFilterFactory()
```
    Returns the factory which can create filters from their nicknames.
    
    Returns:
    
    ProcessingFilter factory
  - createSteps
```
public ProcessingStep[] createSteps(java.lang.String text)
                             throws uk.ac.starlink.task.TaskException
```
    Creates an array of processing filters from an input string. The string may contain zero or more lines, separated by semicolons or newlines.
    
    Parameters:
    
    text - input string
    
    Returns:
    
    array of steps
    
    Throws:
    
    uk.ac.starlink.task.TaskException
  - createStep
```
public ProcessingStep createStep(java.lang.String line)
                          throws uk.ac.starlink.task.TaskException
```
    Creates a processing filter from a line of text. The general format for the line is <filter-name> <filter-args>
    
    Parameters:
    
    line - line of text representing filter commands
    
    Returns:
    
    processing step; may be null if line contains no tokens
    
    Throws:
    
    uk.ac.starlink.task.TaskException
  - getInstance
```
public static StepFactory getInstance()
```
    Returns the singleton instance of this class.
    
    Returns:
    
    StepFactory instance