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package PWC263;
/**
* PL/Java implementation for PWC 263
* Task 1
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-263>
*
*
* 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/PWC263-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC263-1.jar', 'PWC263', true );
select sqlj.set_classpath( 'public', 'PWC263' );
select pwc263.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC263-1.jar', 'PWC263', 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 Task1 {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( schema = "pwc263",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final int[] task1_pljava( int k, int[] nums ) throws SQLException {
logger.log( Level.INFO, "Entering pwc263.task1_pljava" );
List<Integer> source = new LinkedList<Integer>();
for ( int v : nums )
source.add( v );
Collections.sort( source );
final List<Integer> result = new LinkedList<Integer>();
IntStream.range( 0, source.size() )
.forEach( index -> {
if ( source.get( index ) == k )
result.add( index );
} );
int res[] = new int[ result.size() ];
for ( int i = 0; i < res.length; i++ )
res[ i ] = result.get( i );
return res;
}
}
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