Organic Maps sources as of 02.04.2025 (fad26bbf22ac3da75e01e62aa01e5c8e11861005)

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indexer/scale_index.hpp

@@ -0,0 +1,68 @@
+#pragma once
+
+#include "indexer/data_factory.hpp"
+#include "indexer/interval_index.hpp"
+
+#include "coding/var_serial_vector.hpp"
+
+#include <cstdint>
+#include <memory>
+#include <vector>
+
+
+/// Index bucket <--> Draw scale range.
+/// Using default one-to-one mapping.
+class ScaleIndexBase
+{
+public:
+  static uint32_t GetBucketsCount() { return 18; }
+  static uint32_t BucketByScale(int scale) { return static_cast<uint32_t>(scale); }
+  /// @return Range like [x, y).
+  static std::pair<uint32_t, uint32_t> ScaleRangeForBucket(uint32_t bucket)
+  {
+    return {bucket, bucket + 1};
+  }
+};
+
+template <class Reader>
+class ScaleIndex : public ScaleIndexBase
+{
+public:
+  ScaleIndex() = default;
+
+  ScaleIndex(Reader const & reader, IndexFactory const & factory) { Attach(reader, factory); }
+
+  ~ScaleIndex()
+  {
+    Clear();
+  }
+
+  void Clear()
+  {
+    m_IndexForScale.clear();
+  }
+
+  void Attach(Reader const & reader, IndexFactory const & factory)
+  {
+    Clear();
+
+    ReaderSource<Reader> source(reader);
+    VarSerialVectorReader<Reader> treesReader(source);
+    for (uint32_t i = 0; i < treesReader.Size(); ++i)
+      m_IndexForScale.push_back(factory.CreateIndex(treesReader.SubReader(i)));
+  }
+
+  void ForEachInIntervalAndScale(uint64_t beg, uint64_t end, int scale,
+                                 std::function<void(uint64_t, uint32_t)> const & fn) const
+  {
+    auto const scaleBucket = BucketByScale(scale);
+    if (scaleBucket < m_IndexForScale.size())
+    {
+      for (size_t i = 0; i <= scaleBucket; ++i)
+        m_IndexForScale[i]->ForEach(fn, beg, end);
+    }
+  }
+
+private:
+  std::vector<std::unique_ptr<IntervalIndex<Reader, uint32_t>>> m_IndexForScale;
+};