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package PWC257;
/**
* PL/Java implementation for PWC 257
* Task 1
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-257>
*
*
* 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/PWC257.jar luca@venkman:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC257.jar', 'PWC257', true );
select 257.task1_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC257.jar', 'PWC257', 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 org.postgresql.pljava.ResultSetProvider;
import java.sql.ResultSet;
import java.util.*;
import java.sql.SQLException;
import java.util.logging.*;
public class Task1 implements ResultSetProvider {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( schema = "pwc257",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final ResultSetProvider task1_pljava( int[] numbers ) throws SQLException {
logger.log( Level.INFO, "Entering task1_pljava" );
return new Task1( numbers );
}
public Task1( int[] nums ) {
numbers = nums;
}
private int[] numbers;
@Override
public boolean assignRowValues(ResultSet receiver, int currentRow)
throws SQLException {
if ( currentRow >= numbers.length )
return false;
int current = numbers[ currentRow ];
int count = 0;
for ( int other : numbers )
if ( other < current )
count++;
receiver.updateInt( 1, count );
return true;
}
@Override
public void close() { }
}
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