--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/sinfo/flowdepth/FlowDepthAccess.java	Thu Jan 18 18:34:41 2018 +0100
@@ -0,0 +1,88 @@
+/* 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.flowdepth;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+
+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.backend.utils.StringUtil;
+
+/**
+ * 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
+ */
+public class FlowDepthAccess
+extends      RangeAccess
+{
+	public static class DifferencesPair
+	{
+		private final String wstId;
+		private final String soundingId;
+
+		public DifferencesPair( final String wstId, final String soundingId ) {
+			this.wstId = wstId;
+			this.soundingId = soundingId;
+		}
+		
+		public String getWstId() {
+			return this.wstId;
+		}
+
+		public String getSoundingId() {
+			return this.soundingId;
+		}
+	}
+
+	private static final String FIELD_USE_TKH = "use_transport_bodies"; //$NON-NLS-1$
+
+	public FlowDepthAccess(final SINFOArtifact artifact) {
+		super(artifact);
+
+		/* assert calculation mode */
+		final SinfoCalcMode calculationMode = artifact.getCalculationMode();
+		assert(calculationMode == SinfoCalcMode.sinfo_calc_flow_depth);
+	}
+
+	public boolean isUseTransportBodies() {
+		final Boolean useTkh = artifact.getDataAsBoolean( FIELD_USE_TKH );
+		return useTkh == null ? false : useTkh;
+	}
+
+	public Collection<DifferencesPair> getDifferencePairs() {
+
+		final Collection<DifferencesPair> diffPairs = new ArrayList<>();
+
+		 final String diffids = super.getString("diffids");
+		 if( diffids == null )
+		 {
+			 // Should never happen as this is handled by the ui
+			 return Collections.emptyList();
+		 }
+
+		 // FIXME: this way of parsing the datacage-ids is repeated all over flys!
+		 final String datas[] = diffids.split("#");
+		 for(int i = 0; i < datas.length; i+=2) {
+			 final String leftId = StringUtil.unbracket( datas[i] );
+			 final String rightId = StringUtil.unbracket( datas[i+1] );
+
+			 diffPairs.add(new DifferencesPair(leftId, rightId));
+		 }
+
+		return Collections.unmodifiableCollection(diffPairs);
+	}
+}
\ No newline at end of file