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package PWC280;
/**
* PL/Java implementation for PWC 280
* Task 1
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-280>
*
*
* 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/PWC280-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC280-1.jar', 'PWC280', true );
select sqlj.set_classpath( 'public', 'PWC280' );
select pwc280.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC280-1.jar', 'PWC280', 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 Task1 {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( schema = "pwc280",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static String task1_pljava( String string ) throws SQLException {
logger.log( Level.INFO, "Entering pwc280.task1_pljava" );
for ( String needle : string.split( "" ) ) {
int count = 0;
for ( String s : string.split( "" ) )
if ( s.equals( needle ) )
count++;
if ( count > 1 )
return needle;
}
return null;
}
}
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