com.saelist.stx.operators
Class AbstractOperator

java.lang.Object
  com.saelist.stx.operators.AbstractOperator

All Implemented Interfaces:

Operator

Direct Known Subclasses:

ReplaceOperator, SelectOperator, SplitOperator, YankOperator

public abstract class AbstractOperator

extends java.lang.Object

implements Operator

See Operator for general description of the Operator concept in stx.

 Lifecycle: Create { init(config) init() { visit(pairs) { operator(pair) } } }
 Usage: Create { init(config) { visit(pairs) } }
 

Field Summary

protected Pair	config
protected Logger	logger

Constructor Summary

AbstractOperator()

Method Summary

protected void	init() Descendants should overide this if they vant to cache elements of config in member variables or do some other inital setup.
void	init(Pair config) Validates the configuration against the schema and stores it in config, then calls init() to allow descendants to further initialize themselves.
abstract void	operate(Pair pair) Descendant classes will put the code for the actual operation here.
void	visit(java.util.Iterator pairs) Visits the given pairs, typically the result of Pair.select(xpath).

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected Logger logger

config

protected Pair config

Constructor Detail

AbstractOperator

public AbstractOperator()

Method Detail

init

public void init(Pair config)

Validates the configuration against the schema and stores it in config, then calls init() to allow descendants to further initialize themselves.

Specified by:

init in interface Operator

Throws:

IllegalArgumentExeption - if config doesn't validate against #getSchema. The Validator will log warnings aswell as print linenumbers of the mismatches in both files to the standard error.

init

protected void init()

Descendants should overide this if they vant to cache elements of config in member variables or do some other inital setup.

visit

public final void visit(java.util.Iterator pairs)

Visits the given pairs, typically the result of Pair.select(xpath).

Specified by:

visit in interface Operator

Throws:

java.lang.ClassCastException - if pairs contains a non-Pair.

operate

public abstract void operate(Pair pair)

Descendant classes will put the code for the actual operation here.

Specified by:

operate in interface Operator

Throws:

java.lang.IllegalStateException - if this hasn't been initialized.