Merge pull request #9784 from fluca1978/PWC261

PWC 261

1 files changed, 67 insertions, 0 deletions

diff --git a/challenge-261/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-261/luca-ferrari/pljava/src/main/java/Task2.java
new file mode 100644
index 0000000000..df81c3f088
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+++ b/challenge-261/luca-ferrari/pljava/src/main/java/Task2.java
@@ -0,0 +1,67 @@
+
+
+
+package PWC261;
+
+/**
+ * PL/Java implementation for PWC 261
+ * Task 2
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-261>
+ *
+ *
+ * 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/PWC261-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC261-1.jar', 'PWC261', true );
+ select sqlj.set_classpath( 'public', 'PWC261' );
+
+ select pwc261.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC261-1.jar', 'PWC261', 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 {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc261",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final int task2_pljava( int start, int[] nums ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc261.task2_pljava" );
+
+	while ( grep( start, nums ) )
+	    start *= 2;
+
+	return start;
+    }
+
+    private static boolean grep( int needle, int[] nums ) {
+	for ( int current : nums )
+	    if ( current == needle )
+		return true;
+
+	return false;
+    }
+}