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package PWC264;
/**
* PL/Java implementation for PWC 264
* Task 2
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-264>
*
*
* 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/PWC264-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC264-1.jar', 'PWC264', true );
select sqlj.set_classpath( 'public', 'PWC264' );
select pwc264.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC264-1.jar', 'PWC264', 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 = "pwc264",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final int[] task2_pljava( int[] source, int[] indexes ) throws SQLException {
logger.log( Level.INFO, "Entering pwc264.task2_pljava" );
List<Integer> target = new LinkedList<Integer>();
for ( int i = 0; i < indexes.length; i++ ) {
int target_index = indexes[ i ];
if ( target.isEmpty() || target.size() <= target_index )
target.add( source[ i ] );
else {
List<Integer> replace = new LinkedList<Integer>();
for ( int ii = 0; ii < target_index; ii++ )
replace.add( target.get( ii ) );
replace.add( source[ i ] );
for ( int ii = target_index; ii < target.size(); ii++ )
replace.add( target.get( ii ) );
target = replace;
}
}
int[] result = new int[ target.size() ];
int k = 0;
for ( int v : target )
result[ k++ ] = v;
return result;
}
}
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