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package PWC326;
/**
* PL/Java implementation for PWC 326
* Task 2
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-326>
*
*
* 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/PWC326-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC326-1.jar', 'PWC326', true );
select sqlj.set_classpath( 'public', 'PWC326' );
select pwc326.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC326-1.jar', 'PWC326', 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 = "pwc326",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final int[] task2_pljava( int[] nums ) throws SQLException {
logger.log( Level.INFO, "Entering pwc326.task2_pljava" );
List<Integer> result = new LinkedList<Integer>();
for( int i = 0; i < nums.length - 1; i++ ) {
if( i % 2 != 0 )
continue;
int base = nums[ i ];
int times = nums[ i + 1 ];
for ( int j = 0; j < times; j++ )
result.add( base );
}
int r[] = new int[ result.size() ];
for ( int i = 0; i < result.size(); i++ )
r[ i ] = result.get( i );
return r;
}
}
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