v0.2.48..v0.2.49 changeset RandomElementRemover.cpp

diff --git a/hoot-core/src/main/cpp/hoot/core/visitors/RandomElementRemover.cpp b/hoot-core/src/main/cpp/hoot/core/visitors/RandomElementRemover.cpp
new file mode 100644
index 0000000..08869fa
--- /dev/null
+++ b/hoot-core/src/main/cpp/hoot/core/visitors/RandomElementRemover.cpp
@@ -0,0 +1,79 @@
+/*
+ * 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) 2015, 2017, 2018, 2019 DigitalGlobe (http://www.digitalglobe.com/)
+ */
+#include "RandomElementRemover.h"
+
+// boost
+#include <boost/random/uniform_real.hpp>
+
+// hoot
+#include <hoot/core/util/Factory.h>
+#include <hoot/core/ops/RecursiveElementRemover.h>
+#include <hoot/core/util/Settings.h>
+#include <hoot/core/util/ConfigOptions.h>
+#include <hoot/core/util/RandomNumberUtils.h>
+#include <hoot/core/elements/OsmMap.h>
+#include <hoot/core/util/Log.h>
+
+namespace hoot
+{
+
+HOOT_FACTORY_REGISTER(ElementVisitor, RandomElementRemover)
+
+RandomElementRemover::RandomElementRemover()
+{
+  _localRng.reset(new boost::minstd_rand());
+  _rng = _localRng.get();
+}
+
+void RandomElementRemover::setConfiguration(const Settings& conf)
+{
+  ConfigOptions configOptions(conf);
+  setProbability(configOptions.getRandomElementRemoverProbability());
+  const int seed = configOptions.getRandomSeed();
+  LOG_VARD(seed);
+  if (seed == -1)
+  {
+    _rng->seed(RandomNumberUtils::generateSeed());
+  }
+  else
+  {
+    _rng->seed(seed);
+  }
+}
+
+void RandomElementRemover::visit(const ConstElementPtr& e)
+{
+  boost::uniform_real<> uni(0.0, 1.0);
+  if (uni(*_rng) <= _p)
+  {
+    RecursiveElementRemover(
+      ElementId(e->getElementType(), e->getId())).apply(_map->shared_from_this());
+    _numAffected++;
+  }
+}
+
+}