//package PWC253;

/**
 * PL/Java implementation for PWC 253
 * Task 1
 * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-253>
 *
 * To install into PostgreSQL execute:

 select sqlj.install_jar( 'file:///tmp/PWC253.1.jar', 'PWC253', true );
 select sqlj.set_classpath( 'public', 'PWC253' );

 select task$tn_pljava();

*/

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.*;

public class Task1 {

       @Function( onNullInput = RETURNS_NULL, effects = IMMUTABLE )
       public static final String[] task1_pljava( String separator, String[] words ) {
	   List<String> result = new LinkedList<String>();

	   for ( String w : words ) {
	       if ( ! w.contains( separator ) )
		   result.add( w );
	       else
		   result.addAll( w.split( separator ) );
	   }

	   return result;

       }
}