Merge branch 'master' of https://github.com/manwar/perlweeklychallenge-club

1 files changed, 107 insertions, 0 deletions

diff --git a/challenge-259/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-259/luca-ferrari/pljava/src/main/java/Task2.java
new file mode 100644
index 0000000000..1a33f13bea
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+++ b/challenge-259/luca-ferrari/pljava/src/main/java/Task2.java
@@ -0,0 +1,107 @@
+
+
+
+package PWC259;
+
+/**
+ * PL/Java implementation for PWC 259
+ * Task 2
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-259>
+ *
+ *
+ * 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/PWC259-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC259-1.jar', 'PWC259', true );
+
+ select pwc259.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC259-1.jar', 'PWC259', 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.regex.*;
+import java.util.stream.*;
+import java.sql.SQLException;
+import java.util.logging.*;
+import java.sql.ResultSet;
+import java.sql.Date;
+
+public class Task2 implements ResultSetProvider {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc259",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final ResultSetProvider task2_pljava( String line ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc259.task2_pljava : " + line );
+	return new Task2( line );
+    }
+
+
+    public Task2( String line ) throws SQLException {
+	params = new LinkedList< List<String> >();
+	parse( line );
+    }
+
+
+    private final void parse( String line ) throws SQLException {
+	Pattern pattern = Pattern.compile( "[{][%] (\\w+)\\s*(.*)\\s* [%][}]" );
+	Matcher matcher = pattern.matcher( line );
+
+	if ( matcher.find() ) {
+	    id = matcher.group( 1 );
+
+	    Pattern subPattern = Pattern.compile( "(\\w+)[=](\\w+)\\s*" );
+	    Matcher subMatch   = subPattern.matcher( matcher.group( 2 ) );
+
+	    while ( subMatch.find() ) {
+		List<String> current = new LinkedList<String>();
+		current.add( subMatch.group( 1 ) );
+		current.add( subMatch.group( 2 ) );
+		params.add( current );
+
+	    }
+	}
+	else
+	    throw new SQLException( "Cannot parse " + line );
+
+    }
+
+    private List< List<String> > params;
+    private String id;
+
+    @Override
+    public boolean assignRowValues(ResultSet rs, int row)
+	throws SQLException {
+
+	// stop the result set
+	if ( row >= params.size() )
+	    return false;
+
+	rs.updateInt( 1, row );
+	rs.updateString( 2, id );
+	rs.updateString( 3, params.get( row ).get( 0 ) );
+	rs.updateString( 4, params.get( row ).get( 1 ) );
+	return true;
+    }
+
+    @Override
+    public void close() {
+    }
+}