PWC 264

Task 1 Raku done
Task 2 Raku done

Task 1 PL/Perl done
Task 2 PL/perl done

Task 1 PL/PgSQL done
Task 2 PL/PgSQL done

Task 1 PL/Java done
Task 2 PL/Java done

Task 1 Python done
Task 2 Python done

1 files changed, 72 insertions, 0 deletions

diff --git a/challenge-264/luca-ferrari/pljava/src/main/java/Task1.java b/challenge-264/luca-ferrari/pljava/src/main/java/Task1.java
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+++ b/challenge-264/luca-ferrari/pljava/src/main/java/Task1.java
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+
+
+
+package PWC264;
+
+/**
+ * PL/Java implementation for PWC 264
+ * Task 1
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-264>
+ *
+ *
+ * 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/PWC264-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC264-1.jar', 'PWC264', true );
+ select sqlj.set_classpath( 'public', 'PWC264' );
+
+ select pwc264.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC264-1.jar', 'PWC264', 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.util.regex.*;
+
+public class Task1 {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc264",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final String task1_pljava( String string ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc264.task1_pljava" );
+
+	List<String> letters = new LinkedList<String>();
+	for ( String l : string.split( "" ) ) {
+	    if ( ! l.equals( l.toUpperCase() ) )
+		 continue;
+
+	    Pattern regexp = Pattern.compile( l.toLowerCase() );
+	    Matcher engine = regexp.matcher( string );
+	    if ( ! engine.matches() )
+		letters.add( l );
+	}
+
+	if ( letters.isEmpty() )
+	    return "-";
+
+	Collections.sort( letters );
+	return letters.get( letters.size() - 1 );
+    }
+}