Package org.pentaho.di.trans.steps.mergejoin

Class MergeJoinHelper

java.lang.Object

org.pentaho.di.trans.step.BaseStepHelper

org.pentaho.di.trans.steps.mergejoin.MergeJoinHelper

All Implemented Interfaces:

StepHelperInterface

public class MergeJoinHelper
extends BaseStepHelper

Field Summary

Fields inherited from class org.pentaho.di.trans.step.BaseStepHelper

IS_TRANS_REFERENCE, IS_VALID_REFERENCE, log, REFERENCE_PATH, SEPARATOR

Fields inherited from interface org.pentaho.di.trans.step.StepHelperInterface

ACTION_STATUS, FAILURE_METHOD_NOT_FOUND_RESPONSE, FAILURE_RESPONSE, STATUS, SUCCESS_RESPONSE

Constructor Summary

Constructors

Constructor	Description
MergeJoinHelper()

Method Summary

Modifier and Type	Method	Description
protected org.json.simple.JSONObject	handleStepAction(String method, TransMeta transMeta, Map<String,String> queryParams)	Handles step-specific actions for MergeJoin.
org.json.simple.JSONObject	previousKeysAction(TransMeta transMeta, Map<String,String> queryParams)	Retrieves the keys from the previous steps connected to the specified MergeJoin step.

Methods inherited from class org.pentaho.di.trans.step.BaseStepHelper

getReferencePath, isFailedResponse, stepAction, validateAndPutReferenceStatus

Methods inherited from class java.lang.Object

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

Constructor Details

MergeJoinHelper

public MergeJoinHelper()

Method Details

handleStepAction

protected org.json.simple.JSONObject handleStepAction(String method,
 TransMeta transMeta,
 Map<String,String> queryParams)

Handles step-specific actions for MergeJoin.

Specified by:

handleStepAction in class BaseStepHelper

Parameters:

method - The name of the method to execute.

transMeta - The transformation metadata associated with the step.

queryParams - A map of query parameters for the action.

Returns:

A JSON object containing the action status and any additional response data.

previousKeysAction

public org.json.simple.JSONObject previousKeysAction(TransMeta transMeta,
 Map<String,String> queryParams)
                                              throws org.pentaho.di.core.exception.KettleException

Retrieves the keys from the previous steps connected to the specified MergeJoin step.

Parameters:

transMeta - The transformation metadata.

queryParams - A map of query parameters for the action, including "stepName".

Returns:

A JSON object containing the previous step keys and their fields.

Throws:

org.pentaho.di.core.exception.KettleException - if there's an error retrieving step information.