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package PWC264;
/**
* PL/Java implementation for PWC 264
* Task 1
* 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;
import java.util.regex.*;
public class Task1 {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( schema = "pwc264",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final String task1_pljava( String string ) throws SQLException {
logger.log( Level.INFO, "Entering pwc264.task1_pljava" );
List<String> letters = new LinkedList<String>();
for ( String l : string.split( "" ) ) {
if ( ! l.equals( l.toUpperCase() ) )
continue;
Pattern regexp = Pattern.compile( l.toLowerCase() );
Matcher engine = regexp.matcher( string );
if ( ! engine.matches() )
letters.add( l );
}
if ( letters.isEmpty() )
return "-";
Collections.sort( letters );
return letters.get( letters.size() - 1 );
}
}
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