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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.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;
+ }
+}