--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/sinfo/flowdepthdev/FlowDepthDevelopmentAccess.java	Fri Mar 16 18:08:38 2018 +0100
@@ -0,0 +1,67 @@
+/* Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
+ * Software engineering by
+ *  Björnsen Beratende Ingenieure GmbH
+ *  Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
+ *
+ * This file is Free Software under the GNU AGPL (>=v3)
+ * and comes with ABSOLUTELY NO WARRANTY! Check out the
+ * documentation coming with Dive4Elements River for details.
+ */
+
+package org.dive4elements.river.artifacts.sinfo.flowdepthdev;
+
+import java.util.List;
+
+import org.apache.commons.lang.math.DoubleRange;
+import org.dive4elements.river.artifacts.access.RangeAccess;
+import org.dive4elements.river.artifacts.sinfo.SINFOArtifact;
+import org.dive4elements.river.artifacts.sinfo.SinfoCalcMode;
+import org.dive4elements.river.artifacts.sinfo.flowdepth.WstSoundingIdPair;
+
+/**
+ * Access to the flow depth calculation type specific SInfo artifact data.
+ * REMARK: this class is NOT intended to be hold in the results (or anywhere else), in order to avoid a permanent
+ * reference to the artifact instance.
+ * Hence we do NOT cache any data.
+ *
+ * @author Gernot Belger
+ */
+final class FlowDepthDevelopmentAccess extends RangeAccess {
+
+    static final String FIELD_DIFFID_CURRENT = "diffid_current";
+    static final String FIELD_DIFFID_HIST = "diffid_historical";
+
+    public FlowDepthDevelopmentAccess(final SINFOArtifact artifact) {
+        super(artifact);
+
+        /* assert calculation mode */
+        final SinfoCalcMode calculationMode = artifact.getCalculationMode();
+        assert (calculationMode == SinfoCalcMode.sinfo_calc_flow_depth_minmax);
+    }
+
+    public DoubleRange getRange() {
+        final double from = getFrom();
+        final double to = getTo();
+        return new DoubleRange(from, to);
+    }
+
+    public WstSoundingIdPair getCurrentPair() {
+        return getPair(FIELD_DIFFID_CURRENT);
+    }
+
+    public WstSoundingIdPair getHistoricalPair() {
+        return getPair(FIELD_DIFFID_HIST);
+    }
+
+    private WstSoundingIdPair getPair(final String field) {
+        final String diffids = getString(field);
+
+        /* fetch the raw configured pairs */
+        final List<WstSoundingIdPair> diffPairs = WstSoundingIdPair.parsePairs(diffids);
+
+        if (diffPairs.size() != 1)
+            return null;
+
+        return diffPairs.get(0);
+    }
+}
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