--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/backend/src/main/java/org/dive4elements/river/importer/ImportRange.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,78 @@
+package org.dive4elements.river.importer;
+
+import org.dive4elements.river.model.Range;
+import org.dive4elements.river.model.River;
+
+import java.math.BigDecimal;
+
+import org.apache.log4j.Logger;
+
+/** A range that is about to be imported. */
+public class ImportRange
+implements   Comparable<ImportRange>
+{
+    /** Private logger. */
+    private static Logger log = Logger.getLogger(ImportRange.class);
+
+    protected BigDecimal a;
+    protected BigDecimal b;
+
+    protected Range peer;
+
+    public ImportRange() {
+    }
+
+    public ImportRange(BigDecimal a, BigDecimal b) {
+        this.a = a;
+        this.b = b;
+    }
+
+    private static final int compare(BigDecimal a, BigDecimal b) {
+        if (a == null && b == null) {
+            return 0;
+        }
+        if (a == null && b != null) {
+            return -1;
+        }
+        if (a != null && b == null) {
+            return +1;
+        }
+        return a.compareTo(b);
+    }
+
+    public void fixRangesOrder() {
+        if (compare(a, b) > 0) {
+            BigDecimal t = a; a = b; b = t;
+        }
+    }
+
+    public int compareTo(ImportRange other) {
+        int cmp = compare(a, other.a);
+        if (cmp != 0) return cmp;
+        return compare(b, other.b);
+    }
+
+    public BigDecimal getA() {
+        return a;
+    }
+
+    public void setA(BigDecimal a) {
+        this.a = a;
+    }
+
+    public BigDecimal getB() {
+        return b;
+    }
+
+    public void setB(BigDecimal b) {
+        this.b = b;
+    }
+
+    public Range getPeer(River river) {
+        if (peer == null) {
+            peer = ImporterSession.getInstance().getRange(river, a, b);
+        }
+        return peer;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :