Merge pull request #12348 from fluca1978/PWC330

PWC 330

1 files changed, 66 insertions, 0 deletions

diff --git a/challenge-330/luca-ferrari/pljava/src/main/java/Task1.java b/challenge-330/luca-ferrari/pljava/src/main/java/Task1.java
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index 0000000000..9de6bbcdac
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+++ b/challenge-330/luca-ferrari/pljava/src/main/java/Task1.java
@@ -0,0 +1,66 @@
+
+
+
+package PWC330;
+
+/**
+ * PL/Java implementation for PWC 330
+ * Task 1
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-330>
+ *
+ *
+ * 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/PWC330-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC330-1.jar', 'PWC330', true );
+ select sqlj.set_classpath( 'public', 'PWC330' );
+
+ select pwc330.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC330-1.jar', 'PWC330', 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;
+import java.util.regex.*;
+
+public class Task1 {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc330",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final String task1_pljava( String string ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc330.task1_pljava" );
+
+	Pattern regexp = Pattern.compile( "([a-z])([0-9])" );
+	Matcher engine = regexp.matcher( string );
+
+	while ( engine.find() ) {
+	    string = string.replaceAll( engine.group( 1 ) + engine.group( 2 ), "" );
+	    engine = regexp.matcher( string );
+	}
+
+	return string;
+
+    }
+}