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package PWC332;
/**
* PL/Java implementation for PWC 332
* Task 1
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-332>
*
*
* 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/PWC332-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC332-1.jar', 'PWC332', true );
select sqlj.set_classpath( 'public', 'PWC332' );
select pwc332.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC332-1.jar', 'PWC332', 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 = "pwc332",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final boolean task1_pljava( String text ) throws SQLException {
logger.log( Level.INFO, "Entering pwc332.task1_pljava" );
Map<String, Integer> bag = new HashMap<String, Integer>();
boolean ok = true;
for ( String c : text.split( "" ) ) {
bag.putIfAbsent( c, 0 );
bag.put( c, bag.get( c ) + 1 );
if ( bag.get( c ) > 1 )
ok = false;
}
return ok;
}
}
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