Merge pull request #9587 from fluca1978/PWC256

PWC 256

1 files changed, 70 insertions, 0 deletions

diff --git a/challenge-256/luca-ferrari/pljava/src/main/java/Task1.java b/challenge-256/luca-ferrari/pljava/src/main/java/Task1.java
new file mode 100644
index 0000000000..f532901d6e
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+++ b/challenge-256/luca-ferrari/pljava/src/main/java/Task1.java
@@ -0,0 +1,70 @@
+package PWC256;
+
+/**
+ * PL/Java implementation for PWC 256
+ * Task 1
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-256>
+ *
+ *
+ * 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/PWC256.jar  luca@venkman:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC256.jar', 'PWC256', true );
+
+ select 256.task1_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC256.jar', 'PWC256', 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.sql.SQLException;
+import java.util.logging.*;
+
+public class Task1 {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "256",
+	      onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final int task1_pljava( String[] words ) throws SQLException {
+	logger.log( Level.INFO, "Entering task1_pljava" );
+
+	int max = 0;
+	for ( String current : words ) {
+	    int count = count( current, words );
+	    if ( count > max )
+		max = count;
+	}
+
+	return max;
+
+    }
+
+    private static final int count( String word, String[] words ) {
+	int count = 0;
+	StringBuilder builder = new StringBuilder();
+	builder.append( word );
+	word = builder.reverse().toString();
+
+	for ( String w : words )
+	    if ( w.equals( word ) )
+		count++;
+
+	return count;
+    }
+}