diff options
Diffstat (limited to 'challenge-255/luca-ferrari/pljava/src/main/java/Task2.java')
| -rw-r--r-- | challenge-255/luca-ferrari/pljava/src/main/java/Task2.java | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/challenge-255/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-255/luca-ferrari/pljava/src/main/java/Task2.java new file mode 100644 index 0000000000..0a8655ca2a --- /dev/null +++ b/challenge-255/luca-ferrari/pljava/src/main/java/Task2.java @@ -0,0 +1,62 @@ +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.util.stream.*; +import java.sql.SQLException; +import java.util.logging.*; + +public class Task2 { + private final static Logger logger = Logger.getAnonymousLogger(); + + @Function( onNullInput = RETURNS_NULL, effects = IMMUTABLE ) + public static final String task2_pljava( String paragraph, String banned ) throws SQLException { + logger.log( Level.INFO, "Entering task2_pljava" ); + + Map<String, Integer> classification = new HashMap<String, Integer>(); + for ( String word : paragraph.split( "\\W+" ) ) { + if ( word.equals( banned ) ) + continue; + + int value = classification.containsKey( word ) ? classification.get( word ) : 0; + classification.put( word, ++value ); + } + + String topValue = classification.entrySet() + .stream() + .sorted( Collections.reverseOrder( Map.Entry.comparingByValue() ) ) + .findFirst().get().getKey(); + + return topValue; + } +} |
