com.neurosys.etl.common.transformers

Class SmartSingleValuesTransformer

java.lang.Object

com.neurosys.etl.common.transformers.SmartSingleValuesTransformer

All Implemented Interfaces:

FunctionTransformer, Function, org.apache.commons.collections.Transformer

public class SmartSingleValuesTransformer
extends Object
implements FunctionTransformer

Many transport mechnaisms and requests may default use Arrays or Collections as values in a Data-Structure (most preferbly a Map). For processing purposes its a necessary step to often extract the single value from the default List as the actual value.

By default NOT modify the original input Collection or Map ; and return a new instance. To attempt to modify input instance use modifyInstance = true If the input is an unmodifiable Collection it may result in an Exception or an ArrayList being created as a return object.

Author:

Arjun Dhar

Constructor Summary

Constructors

Constructor and Description
SmartSingleValuesTransformer()

Method Summary

Modifier and Type	Method and Description
Set<String>	getParamsAsCollections() If any param name in this Set it will be treated as a collection else the result will be returned as single value if a collection is passed (0th element only). If the main data structure is a List then index positions starting from 0 as Integer can be set.
boolean	isModifyInstance() If true, attempt modification of the input Object
protected Object	processElement(Object key, Object o)
void	setModifyInstance(boolean modifyInstance) If true, attempt modification of the input Object
void	setParamsAsCollections(Set<String> paramsAsCollections) If any param name in this Set it will be treated as a collection else the result will be returned as single value if a collection is passed (0th element only). If the main data structure is a List then index positions starting from 0 as Integer can be set.
Object	transform(Object input)

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.neurosys.etl.common.transformers.FunctionTransformer

apply

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Constructor Detail

SmartSingleValuesTransformer

public SmartSingleValuesTransformer()

Method Detail

processElement

protected Object processElement(Object key,
                                Object o)

transform

public Object transform(Object input)

Specified by:

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

getParamsAsCollections

public Set<String> getParamsAsCollections()

If any param name in this Set it will be treated as a collection else the result will be returned as single value if a collection is passed (0th element only).
If the main data structure is a List then index positions starting from 0 as Integer can be set.

setParamsAsCollections

public void setParamsAsCollections(Set<String> paramsAsCollections)

If any param name in this Set it will be treated as a collection else the result will be returned as single value if a collection is passed (0th element only).
If the main data structure is a List then index positions starting from 0 as Integer can be set.

isModifyInstance

public boolean isModifyInstance()

If true, attempt modification of the input Object

Default value:

false

setModifyInstance

public void setModifyInstance(boolean modifyInstance)

If true, attempt modification of the input Object

Default value:

false