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package PWC255;
/**
* PL/Java implementation for PWC 255
* Task 1
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-255>
*
*
* 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/PWC253-1.jar luca@venkman:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC255-1.jar', 'PWC255', true );
select sqlj.set_classpath( 'public', 'PWC255' );
select task1_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC255-1.jar', 'PWC255', 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.sql.SQLException;
import java.util.logging.*;
public class Task1 {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( onNullInput = RETURNS_NULL, effects = IMMUTABLE )
public static final String task1_pljava( String origin, String shuffled ) throws SQLException {
logger.log( Level.INFO, "Entering task1_pljava" );
if ( origin.length() + 1 != shuffled.length() ) {
throw new SQLException( "Shuffled string should be one character longer than the original one" );
}
Map<String, Integer> classification = new HashMap<String, Integer>();
for ( String needle : shuffled.split( "" ) ) {
int value = classification.keySet().contains( needle )
? classification.get( needle )
: 0;
classification.put( needle, ++value );
}
for ( String comparison : origin.split( "" ) ) {
int value = classification.get( comparison );
value--;
if ( value > 0 )
classification.put( comparison, value );
else
classification.remove( comparison );
}
return classification.keySet().iterator().next();
}
}
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