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package PWC261;
/**
* PL/Java implementation for PWC 261
* Task 1
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-261>
*
*
* To compile on the local machine:
$ export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64/ # if not already set
$ mvn clean build
$ scp target/PWC261-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC261-1.jar', 'PWC261', true );
select sqlj.set_classpath( 'public', 'PWC261' );
select pwc261.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC261-1.jar', 'PWC261', true );
*/
import org.postgresql.pljava.*;
import org.postgresql.pljava.annotation.Function;
import static org.postgresql.pljava.annotation.Function.Effects.IMMUTABLE;
import static org.postgresql.pljava.annotation.Function.OnNullInput.RETURNS_NULL;
import java.util.*;
import java.util.stream.*;
import java.sql.SQLException;
import java.util.logging.*;
import java.sql.ResultSet;
import java.sql.Date;
import java.lang.Math;
public class Task1 {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( schema = "pwc261",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final int task1_pljava( int nums[] ) throws SQLException {
logger.log( Level.INFO, "Entering pwc261.task1_pljava" );
int sum_numbers = 0;
int sum_digits = 0;
for ( int current : nums ) {
sum_numbers += current;
while ( current > 0 ) {
sum_digits += current % 10;
current /= 10;
}
}
return Math.abs( sum_numbers - sum_digits );
}
}
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