scriptella.core

Class EtlVariable

java.lang.Object

scriptella.core.EtlVariable

All Implemented Interfaces:

ParametersCallback

public class EtlVariable
extends Object
implements ParametersCallback

Represents a global etl variable available for all ETL file elements.

As of 1.1 a new syntax is introduced based on JEXL function namespaces:

• date: namespace contains functions from EtlVariable.DateUtils, e.g. date:now()
• text: namespace contains functions from EtlVariable.TextUtils, e.g. text:ifNull()
• class: namespace contains functions from EtlVariable.ClassUtils, e.g. class:forName('java.lang.System').getProperty('java.version')

Version:

1.0

Author:

Fyodor Kupolov

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	EtlVariable.ClassUtils Utility class for ETL expressions.
static class	EtlVariable.DateUtils Utility class for ETL file expressions.
static class	EtlVariable.TextUtils Utility class for ETL file expressions.

Field Summary

Fields

Modifier and Type	Field and Description
static String	NAME

Constructor Summary

Constructors

Constructor and Description
EtlVariable()
EtlVariable(ParametersCallback parametersCallback, Map<String,Object> globals)

Method Summary

Methods

Modifier and Type	Method and Description
EtlVariable.ClassUtils	getClazz()
EtlVariable.DateUtils	getDate()
Map<String,Object>	getGlobals() Getter for a global variables storage.
Object	getParameter(String name) Accessor method for parameters available in the current execution context.
EtlVariable.TextUtils	getText()
Class	loadClass(String name)

Methods inherited from class java.lang.Object

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

Field Detail

NAME

public static final String NAME

See Also:

Constant Field Values

Constructor Detail

EtlVariable

public EtlVariable(ParametersCallback parametersCallback,
           Map<String,Object> globals)

EtlVariable

public EtlVariable()

Method Detail

getDate

public EtlVariable.DateUtils getDate()

getText

public EtlVariable.TextUtils getText()

getClazz

public EtlVariable.ClassUtils getClazz()

loadClass

public Class loadClass(String name)
                throws ClassNotFoundException

Throws:

ClassNotFoundException

getParameter

public Object getParameter(String name)

Accessor method for parameters available in the current execution context. Useful for cases when variables has special symbols which cannot be referenced as normal JEXL variables, e.g. etl.getParameter('Column Name')

Specified by:

getParameter in interface ParametersCallback

Parameters:

name - parameter name.

Returns:

value of the parameter.

getGlobals

public Map<String,Object> getGlobals()

Getter for a global variables storage.

This map is shared between all etl file elements and can be used for cases when there is a need to share some state globally. It is recommended to avoid using global variables except cases when it's really beneficiary and simplifies the ETL file.

Returns:

map of global variables in the scope of ETL file.