v0.2.47..v0.2.48 changeset ElementComparer.h

diff --git a/hoot-core/src/main/cpp/hoot/core/elements/ElementComparer.h b/hoot-core/src/main/cpp/hoot/core/elements/ElementComparer.h
new file mode 100644
index 0000000..018d29b
--- /dev/null
+++ b/hoot-core/src/main/cpp/hoot/core/elements/ElementComparer.h
@@ -0,0 +1,70 @@
+/*
+ * This file is part of Hootenanny.
+ *
+ * Hootenanny is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --------------------------------------------------------------------
+ *
+ * The following copyright notices are generated automatically. If you
+ * have a new notice to add, please use the format:
+ * " * @copyright Copyright ..."
+ * This will properly maintain the copyright information. DigitalGlobe
+ * copyrights will be updated automatically.
+ *
+ * @copyright Copyright (C) 2016, 2017, 2018, 2019 DigitalGlobe (http://www.digitalglobe.com/)
+ */
+#ifndef ELEMENTCOMPARER_H
+#define ELEMENTCOMPARER_H
+
+// Hoot
+#include <hoot/core/elements/Element.h>
+
+namespace hoot
+{
+
+/**
+ * Compares two elements of the same type for similarity
+ */
+class ElementComparer
+{
+
+public:
+
+  static const long DEBUG_ID = 0;
+
+  explicit ElementComparer(Meters threshold = 0.05);
+
+  bool isSame(ElementPtr e1, ElementPtr e2) const;
+
+private:
+
+  //currently, this threshold applies only to non-node circular error checks and the var would
+  //eventually go away completely if all element types were converted over to uses hashes for
+  //comparisons
+  Meters _threshold;
+
+  bool _compareNode(const std::shared_ptr<const Element>& re,
+                    const std::shared_ptr<const Element>& e) const;
+  bool _compareWay(const std::shared_ptr<const Element>& re,
+                   const std::shared_ptr<const Element>& e) const;
+  bool _compareRelation(const std::shared_ptr<const Element>& re,
+                        const std::shared_ptr<const Element>& e) const;
+
+  void _removeTagsNotImportantForComparison(Tags& tags) const;
+
+};
+
+}
+
+#endif // ELEMENTCOMPARER_H