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package PWC278;
/**
* PL/Java implementation for PWC 278
* Task 2
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-278>
*
*
* 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/PWC278-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC278-1.jar', 'PWC278', true );
select sqlj.set_classpath( 'public', 'PWC278' );
select pwc278.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC278-1.jar', 'PWC278', 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 = "pwc278",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final String task2_pljava( String word, String c ) throws SQLException {
logger.log( Level.INFO, "Entering pwc278.task2_pljava" );
if ( ! word.contains( c ) )
return word;
final List<String> left = new LinkedList<String>();
final List<String> right = new LinkedList<String>();
final boolean[] found = { false };
Stream.of( word.split( "" ) ).forEach( letter -> {
if ( found[ 0 ] )
right.add( letter );
else {
left.add( letter );
if ( letter.equals( c ) )
found[ 0 ] = true;
}
} );
Collections.sort( left );
return left.stream().collect( Collectors.joining() ) + right.stream().collect( Collectors.joining() );
}
}
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