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package PWC329;
/**
* PL/Java implementation for PWC 329
* Task 2
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-329>
*
*
* 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/PWC329-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC329-1.jar', 'PWC329', true );
select sqlj.set_classpath( 'public', 'PWC329' );
select pwc329.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC329-1.jar', 'PWC329', 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 = "pwc329",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final String task2_pljava( String string ) throws SQLException {
logger.log( Level.INFO, "Entering pwc329.task2_pljava" );
char chars[] = string.toCharArray();
int begin = 0;
int end = 0;
for ( int i = 0; i < chars.length; i++ ) {
char c = chars[ i ];
char n = Character.toUpperCase( c );
if ( Character.isUpperCase( c ) )
n = Character.toLowerCase( c );
for ( int j = i + 1; j < chars.length; j++ )
if ( chars[ j ] == n )
if ( ( end - begin ) < ( j - i ) ) {
begin = i;
end = j;
}
}
return string.substring( begin, end + 1 );
}
}
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