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+/***********************************************************************
+ * Software License Agreement (BSD License)
+ *
+ * Copyright 2008-2009  Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
+ * Copyright 2008-2009  David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
+ *
+ * THE BSD LICENSE
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *************************************************************************/
+
+#ifndef OPENCV_FLANN_LINEAR_INDEX_H_
+#define OPENCV_FLANN_LINEAR_INDEX_H_
+
+#include "general.h"
+#include "nn_index.h"
+
+namespace cvflann
+{
+
+struct LinearIndexParams : public IndexParams
+{
+    LinearIndexParams()
+    {
+        (* this)["algorithm"] = FLANN_INDEX_LINEAR;
+    }
+};
+
+template <typename Distance>
+class LinearIndex : public NNIndex<Distance>
+{
+public:
+
+    typedef typename Distance::ElementType ElementType;
+    typedef typename Distance::ResultType DistanceType;
+
+
+    LinearIndex(const Matrix<ElementType>& inputData, const IndexParams& params = LinearIndexParams(),
+                Distance d = Distance()) :
+        dataset_(inputData), index_params_(params), distance_(d)
+    {
+    }
+
+    LinearIndex(const LinearIndex&);
+    LinearIndex& operator=(const LinearIndex&);
+
+    flann_algorithm_t getType() const
+    {
+        return FLANN_INDEX_LINEAR;
+    }
+
+
+    size_t size() const
+    {
+        return dataset_.rows;
+    }
+
+    size_t veclen() const
+    {
+        return dataset_.cols;
+    }
+
+
+    int usedMemory() const
+    {
+        return 0;
+    }
+
+    void buildIndex()
+    {
+        /* nothing to do here for linear search */
+    }
+
+    void saveIndex(FILE*)
+    {
+        /* nothing to do here for linear search */
+    }
+
+
+    void loadIndex(FILE*)
+    {
+        /* nothing to do here for linear search */
+
+        index_params_["algorithm"] = getType();
+    }
+
+    void findNeighbors(ResultSet<DistanceType>& resultSet, const ElementType* vec, const SearchParams& /*searchParams*/)
+    {
+        ElementType* data = dataset_.data;
+        for (size_t i = 0; i < dataset_.rows; ++i, data += dataset_.cols) {
+            DistanceType dist = distance_(data, vec, dataset_.cols);
+            resultSet.addPoint(dist, (int)i);
+        }
+    }
+
+    IndexParams getParameters() const
+    {
+        return index_params_;
+    }
+
+private:
+    /** The dataset */
+    const Matrix<ElementType> dataset_;
+    /** Index parameters */
+    IndexParams index_params_;
+    /** Index distance */
+    Distance distance_;
+
+};
+
+}
+
+#endif // OPENCV_FLANN_LINEAR_INDEX_H_