[PATCH 2 of 4] Add getFirstLastKM utiltity function to WQKms

[Wald Commits]

# HG changeset patch
# User Andre Heinecke <aheinecke at intevation.de>
# Date 1374146031 -7200
# Node ID 38ee580a30cb830fcfbb2e4950138368be6d8bea
# Parent  ca56c4e6a755a808b9b55a293c2090664dbdfa5e
Add getFirstLastKM utiltity function to WQKms

    I found this useful.

diff -r ca56c4e6a755 -r 38ee580a30cb artifacts/src/main/java/org/dive4elements/river/artifacts/model/WQKms.java
--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/model/WQKms.java	Thu Jul 18 13:12:39 2013 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/WQKms.java	Thu Jul 18 13:13:51 2013 +0200
@@ -143,5 +143,15 @@
         double to   = getKm(size()-1);
         return from + " - " + to;
     }
+
+    /**
+     * Returns an array of two double values the first and last kilometer.
+     *
+     * @return a double array with the first and last km
+     */
+    public double[] getFirstLastKM() {
+        /* Behold the first km might be larger then the last! */
+        return new double[] {getKm(0), getKm(size()-1)};
+    }
 }
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