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+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;
+ }
+}