PWC 263

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, 103 insertions, 0 deletions

diff --git a/challenge-263/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-263/luca-ferrari/pljava/src/main/java/Task2.java
new file mode 100644
index 0000000000..e177ef5a38
--- /dev/null
+++ b/challenge-263/luca-ferrari/pljava/src/main/java/Task2.java
@@ -0,0 +1,103 @@
+
+
+
+package PWC263;
+
+/**
+ * PL/Java implementation for PWC 263
+ * Task 2
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-263>
+ *
+ *
+ * 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/PWC263-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC263-1.jar', 'PWC263', true );
+ select sqlj.set_classpath( 'public', 'PWC263' );
+
+ select pwc263.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC263-1.jar', 'PWC263', 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;
+
+public class Task2 implements ResultSetProvider {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc263",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final ResultSetProvider task2_pljava( int i[], int j[] ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc263.task2_pljava" );
+	return new Task2( i, j );
+    }
+
+
+    Map<Integer, Integer> quantity = new HashMap<Integer, Integer>();
+    List<Integer> items = new LinkedList<Integer>();
+
+    public Task2( int[] i, int[] j ) {
+	super();
+
+	int index = 0;
+	while ( index < i.length ) {
+	    int item = i[ index ];
+	    int qty  = i[ index + 1 ];
+	    quantity.put( i[ index ], i[ index + 1 ] );
+	    index += 2;
+	}
+
+	index = 0;
+	while ( index < j.length ) {
+	    int item = j[ index ];
+	    int qty  = j[ index + 1 ];
+	    if ( quantity.containsKey( item ) )
+		qty += quantity.get( item );
+
+
+	    quantity.put( item, qty );
+	    index += 2;
+	}
+
+	items.addAll( quantity.keySet() );
+
+    }
+
+    @Override
+    public boolean assignRowValues( ResultSet tuples, int row )
+	throws SQLException {
+
+	if ( items.isEmpty() || quantity.isEmpty() )
+	    return false;
+
+	int item = items.remove( 0 );
+
+	tuples.updateInt( 1, item );
+	tuples.updateInt( 2, quantity.get( item ) );
+	return true;
+    }
+
+    @Override
+    public void close() {}
+}