com.bazaarvoice.jolt.common

Class PathEvaluatingTraversal

java.lang.Object

com.bazaarvoice.jolt.common.PathEvaluatingTraversal

Direct Known Subclasses:

ShiftrWriter, TransposeReader

public abstract class PathEvaluatingTraversal
extends Object

Combines a Traversr with the ability to evaluate References against a WalkedPath. Convenience class for path based off a single dot notation String, like "rating.&1(2).&.value". This processes the dot notation path into internal data structures, so that the String processing only happens once.

Constructor Summary

Constructors

Constructor and Description
PathEvaluatingTraversal(String dotNotation)

Method Summary

Modifier and Type	Method and Description
protected abstract Traversr	createTraversr(List<String> paths)
List<String>	evaluate(WalkedPath walkedPath) Use the supplied WalkedPath, in the evaluation of each of our PathElements.
PathElement	get(int index)
String	getCanonicalForm() Testing method.
Optional<Object>	read(Object data, WalkedPath walkedPath)
int	size()
void	write(Object data, Map<String,Object> output, WalkedPath walkedPath) Use the supplied WalkedPath, in the evaluation of each of our PathElements to build a concrete output path.

Methods inherited from class java.lang.Object

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

Constructor Detail

PathEvaluatingTraversal

public PathEvaluatingTraversal(String dotNotation)

Method Detail

createTraversr

protected abstract Traversr createTraversr(List<String> paths)

write

public void write(Object data,
                  Map<String,Object> output,
                  WalkedPath walkedPath)

Use the supplied WalkedPath, in the evaluation of each of our PathElements to build a concrete output path. Then use that output path to write the given data to the output.

Parameters:

data - data to write

output - data structure we are going to write the data to

walkedPath - reference used to lookup reference values like "&1(2)"

read

public Optional<Object> read(Object data,
                             WalkedPath walkedPath)

evaluate

public List<String> evaluate(WalkedPath walkedPath)

Use the supplied WalkedPath, in the evaluation of each of our PathElements. If our PathElements contained a TransposePathElement, we may return null.

Parameters:

walkedPath - used to lookup/evaluate PathElement references values like "&1(2)"

Returns:

null or fully evaluated Strings, possibly with concrete array references like "photos.[3]"

size

public int size()

get

public PathElement get(int index)

getCanonicalForm

public String getCanonicalForm()

Testing method.