Merge pull request #12462 from fluca1978/PWC333

PWC 333

1 files changed, 76 insertions, 0 deletions

diff --git a/challenge-333/luca-ferrari/pljava/src/main/java/Task1.java b/challenge-333/luca-ferrari/pljava/src/main/java/Task1.java
new file mode 100644
index 0000000000..350a46cf82
--- /dev/null
+++ b/challenge-333/luca-ferrari/pljava/src/main/java/Task1.java
@@ -0,0 +1,76 @@
+
+
+
+package PWC333;
+
+/**
+ * PL/Java implementation for PWC 333
+ * Task 1
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-333>
+ *
+ *
+ * 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/PWC333-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC333-1.jar', 'PWC333', true );
+ select sqlj.set_classpath( 'public', 'PWC333' );
+
+ select pwc333.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC333-1.jar', 'PWC333', 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 Task1 {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc333",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final boolean task1_pljava( int coordinates[] ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc333.task1_pljava" );
+
+	List<Map<String, Integer>> coords = new LinkedList<Map<String, Integer>>();
+
+	for ( int i = 0; i < coordinates.length - 1; i++ ) {
+	    Map<String, Integer> current = new HashMap<String, Integer>();
+	    current.put( "x", coordinates[ i++ ] );
+	    current.put( "y", coordinates[ i ] );
+	    coords.add( current );
+	}
+
+	Map<String, Integer> first  = coords.get( 0 );
+	Map<String, Integer> second = coords.get( 1 );
+
+	for ( int i = 2; i < coords.size(); i++ ) {
+	    Map<String, Integer> current = coords.get( i );
+
+	    if ( ( current.get( "x" ) - first.get( "x" ) ) * ( first.get( "y" ) - second.get( "y" ) )
+		 != ( current.get( "y" ) - first.get( "y" ) ) * ( first.get( "x" ) - second.get( "x" ) ) )
+		return false;
+	}
+
+	return true;
+    }
+}