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package PWC275;
/**
* PL/Java implementation for PWC 275
* Task 2
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-275>
*
*
* 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/PWC275-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC275-1.jar', 'PWC275', true );
select sqlj.set_classpath( 'public', 'PWC275' );
select pwc275.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC275-1.jar', 'PWC275', 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.regex.*;
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 = "pwc275",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final String task2_pljava( String text ) throws SQLException {
logger.log( Level.INFO, "Entering pwc275.task2_pljava" );
Pattern digit = Pattern.compile( "\\d", Pattern.CASE_INSENSITIVE );
final String[] previous = new String[ 1 ];
return Stream.of( text.split( "" ) )
.map( current -> {
if ( digit.matcher( current ).find() ) {
// a digit
current = String.format( "%c", ( (int) previous[ 0 ].charAt( 0 ) + Integer.parseInt( current ) ) );
}
else {
previous[ 0 ] = current;
}
return current;
} )
.collect( Collectors.joining("") );
}
}
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