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package PWC333;
/**
* PL/Java implementation for PWC 333
* Task 2
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-333>
*
*
* 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/PWC333-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC333-1.jar', 'PWC333', true );
select sqlj.set_classpath( 'public', 'PWC333' );
select pwc333.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC333-1.jar', 'PWC333', 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;
public class Task2 {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( schema = "pwc333",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final int[] task2_pljava( int[] numbers ) throws SQLException {
logger.log( Level.INFO, "Entering pwc333.task2_pljava" );
List<Integer> result = new LinkedList<Integer>();
int limit = numbers.length;
for ( int i = 0; i < numbers.length && limit > 0; i++ ) {
result.add( numbers[ i ] );
limit--;
if ( limit == 0 )
break;
if ( numbers[ i ] == 0 ) {
result.add( numbers[ i ] );
limit--;
}
}
int[] tmp = new int[ result.size() ];
for ( int i = 0; i < tmp.length; i++ )
tmp[ i ] = result.get( i );
return tmp;
}
}
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