[PATCH 1 of 2] WDifferencesCurveGenerator: added a logger

[Wald Commits]

# HG changeset patch
# User Felix Wolfsteller <felix.wolfsteller at intevation.de>
# Date 1374144180 -7200
# Node ID 8d1d90adc6525ef8502fa9efe0884776b72ec1f3
# Parent  61897a2b8283cab15c20804208e33636c6ef356f
WDifferencesCurveGenerator: added a logger.

diff -r 61897a2b8283 -r 8d1d90adc652 artifacts/src/main/java/org/dive4elements/river/exports/WDifferencesCurveGenerator.java
--- a/artifacts/src/main/java/org/dive4elements/river/exports/WDifferencesCurveGenerator.java	Thu Jul 18 12:37:08 2013 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/exports/WDifferencesCurveGenerator.java	Thu Jul 18 12:43:00 2013 +0200
@@ -8,6 +8,11 @@
 
 package org.dive4elements.river.exports;
 
+import org.apache.log4j.Logger;
+
+import org.dive4elements.artifactdatabase.state.ArtifactAndFacet;
+import org.dive4elements.artifactdatabase.state.Facet;
+
 import org.dive4elements.river.artifacts.model.FacetTypes;
 import org.dive4elements.river.artifacts.model.WKms;
 
@@ -22,6 +27,9 @@
 extends      LongitudinalSectionGenerator
 implements   FacetTypes
 {
+    /** The logger that is used in this generator. */
+    private static Logger logger = Logger.getLogger(WDifferencesCurveGenerator.class);
+
     public enum YAXIS {
         W(0),
         D(1),