com.neurosys.etl.common.filters

Class NullFilter

java.lang.Object

com.neurosys.etl.common.filters.NullFilter

All Implemented Interfaces:

ChainAware, Lookup, org.apache.commons.collections.Predicate, org.apache.commons.collections.Transformer

public class NullFilter
extends Object
implements org.apache.commons.collections.Predicate, Lookup, org.apache.commons.collections.Transformer, ChainAware

Filter nulls or empty values. Will return false if null or empty (configurable for empty conditions)
A transformer like AbstractEntityTransformer will interpret the null as a BreakChainException or return a null value back in the chain (using ContinueProcessingException)

If You want to use as a Filter (Predicate), the null filter to reject the record then set throwException as true.
If you use as a Transformer then it will throw Exceptions if no defaultValue is used, else on null the defaultValue is returned. TODO: Add to unit test case JSONNull conditions

Author:

Arjun Dhar

Constructor Summary

Constructors

Constructor and Description
NullFilter()

Method Summary

Modifier and Type	Method and Description
boolean	evaluate(Object object)
Chain	getChain() If the processor that implements this is part of a chain, it will return a reference to the chain else null
Object	getDefaultValue() In any Transformation or Lookup, if the default value is sent then instead of null or causing an exception, it will return the default value
Object	getPredecessor() Get the item before this one in the Chain
boolean	isBlank()
boolean	isEmpty()
boolean	isThrowException() If true the filter will reject the record by means of an Exception (not a BreakChainException), if being used as a Transformer then a ContinueProcessingException will be thrown if true
void	setBlank(boolean blank)
void	setChain(Chain chain) If the processor that implements this is part of a chain, it will have a reference to the chain
void	setDefaultValue(Object defaultValue) In any Transformation or Lookup, if the default value is sent then instead of null or causing an exception, it will return the default value
void	setEmpty(boolean empty)
void	setPredecessor(Object predecessor) Get the item before this one in the Chain
void	setThrowException(boolean throwException) If true the filter will reject the record by means of an Exception (not a BreakChainException), if being used as a Transformer then a ContinueProcessingException will be thrown if true
Object	transform(Object input) For a Given String, Lookup a value for it

Methods inherited from class java.lang.Object

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

Constructor Detail

NullFilter

public NullFilter()

Method Detail

evaluate

public boolean evaluate(Object object)

Specified by:

evaluate in interface org.apache.commons.collections.Predicate

isEmpty

public boolean isEmpty()

setEmpty

public void setEmpty(boolean empty)

isBlank

public boolean isBlank()

setBlank

public void setBlank(boolean blank)

transform

public Object transform(Object input)

Description copied from interface: Lookup

For a Given String, Lookup a value for it

Specified by:

transform in interface Lookup

Specified by:

transform in interface org.apache.commons.collections.Transformer

setChain

public void setChain(Chain chain)

Description copied from interface: ChainAware

If the processor that implements this is part of a chain, it will have a reference to the chain

Specified by:

setChain in interface ChainAware

Parameters:

chain - as Chain

getChain

public Chain getChain()

Description copied from interface: ChainAware

If the processor that implements this is part of a chain, it will return a reference to the chain else null

Specified by:

getChain in interface ChainAware

Returns:

Chain

getPredecessor

public Object getPredecessor()

Description copied from interface: ChainAware

Get the item before this one in the Chain

Specified by:

getPredecessor in interface ChainAware

setPredecessor

public void setPredecessor(Object predecessor)

Description copied from interface: ChainAware

Get the item before this one in the Chain

Specified by:

setPredecessor in interface ChainAware

getDefaultValue

public Object getDefaultValue()

In any Transformation or Lookup, if the default value is sent then instead of null or causing an exception, it will return the default value

setDefaultValue

public void setDefaultValue(Object defaultValue)

In any Transformation or Lookup, if the default value is sent then instead of null or causing an exception, it will return the default value

isThrowException

public boolean isThrowException()

If true the filter will reject the record by means of an Exception (not a BreakChainException), if being used as a Transformer then a ContinueProcessingException will be thrown if true

setThrowException

public void setThrowException(boolean throwException)

If true the filter will reject the record by means of an Exception (not a BreakChainException), if being used as a Transformer then a ContinueProcessingException will be thrown if true