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package PWC260;
/**
* PL/Java implementation for PWC 260
* Task 2
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-260>
*
*
* 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/PWC260-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC260-1.jar', 'PWC260', true );
select sqlj.set_classpath( 'public', 'pwc260' );
select pwc260.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC260-1.jar', 'PWC260', 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.math.*;
public class Task2 {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( schema = "pwc260",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final int task2_pljava( String word ) throws SQLException {
logger.log( Level.INFO, "Entering pwc260.task2_pljava" );
List<String> chars = new LinkedList<String>();
for ( String s : word.split( "" ) ) {
logger.log( Level.INFO, "CHAR " + s );
chars.add( s );
}
List<String> words = new LinkedList<String>();
BigInteger limit = BigInteger.ONE;
for ( int i = 1; i <= chars.size(); i++ ) {
limit = limit.multiply( new BigInteger( "" + i ) );
}
logger.log( Level.INFO, "Limit is " + limit );
while ( BigInteger.ZERO.compareTo( limit ) < 0 ) {
String newWord = "";
do {
Collections.shuffle( chars );
newWord = String.join( "", chars );
} while ( words.contains( newWord ) );
words.add( newWord );
limit = limit.subtract( BigInteger.ONE );
}
Collections.sort( words );
for ( int i = 0; i < words.size(); i++ )
if ( words.get( i ).equals( word ) )
return i + 1;
return -1;
}
}
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