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package PWC289;
/**
* PL/Java implementation for PWC 289
* Task 2
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-289>
*
*
* 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/PWC289-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC289-1.jar', 'PWC289', true );
select sqlj.set_classpath( 'public', 'PWC289' );
select pwc289.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC289-1.jar', 'PWC289', 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;
import java.util.regex.*;
public class Task2 {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( schema = "pwc289",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final String[] task2_pljava( String[] words ) throws SQLException {
logger.log( Level.INFO, "Entering pwc289.task2_pljava" );
List<String> result = new LinkedList<String>();
for ( String current : words ) {
String[] letters = current.split( "" );
int last_index = letters.length - 1;
int first_index = 0;
Pattern pattern = Pattern.compile( "^[a-z0-9A-Z]$" );
while ( ! pattern.matcher( letters[ last_index ] ).find() )
last_index--;
List<String> shuffling = new LinkedList<String>();
for ( int i = 1; i < last_index; i++ )
shuffling.add( letters[ i ] );
Collections.shuffle( shuffling );
String current_result = letters[ first_index ] + String.join( "", shuffling );
for ( int i = last_index; i < letters.length; i++ )
current_result += letters[ i ];
result.add( current_result );
}
String[] output = new String[ result.size() ];
for ( int i = 0; i < output.length; i++ )
output[ i ] = result.get( i );
return output;
}
}
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