User Defined Java Class

Demonstration to illustrate the Modified JavaScript Value step. We're going to use: 'Replace' function to substitute characters in a string.

In this workshop, you will:

• Configure the following steps:

  • User Defined Java Class

User Defined Java Class

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First Tab

Second Tab

1. Generate rows

2. UDJC

This Java code is part of a class or method that processes rows of data.

Let's break it down:

1. Import Statements:

   import java.util.*;

   These statements import the java.util package, which includes various utility classes like Calendar.

2. Private Fields:

   private int yearIndex;
   private Calendar calendar;

   These are private instance fields of the class. yearIndex is an integer, and calendar is an instance of the Calendar class.

3. processRow Method: This method is used to process rows of data. It takes two parameters, StepMetaInterface smi and StepDataInterface sdi, and it may throw a KettleException.

   • It checks if there is a row available for processing using getRow(). If there is no row, it marks the output as done and returns false.

   • The if (first) block initializes some variables the first time this method is called. It finds the index of a field named "YEAR" in the input data, creates a Calendar instance, and clears it.

   • It resizes the outputRowData array to match the output row's metadata size.

   • It extracts the year value from the input row using getInteger and calculates the Easter date using the easterDate method.

   • It adds the Easter date to the output row data and puts it into the output stream using putRow.

4. easterDate Method: This method calculates the date of Easter for a given year using the algorithm to determine the date of Easter Sunday.

   • It takes the year as a parameter.

   • It performs several mathematical calculations to determine the day, month, and year of Easter based on the input year.

   • Finally, it sets the calculated date in the calendar instance and returns the Date object representing the Easter date.

Overall, this code is part of a data processing routine, and the easterDate method calculates the date of Easter for a given year using a well-known algorithm for determining Easter's date.

User Defined Java Class - Calender