| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #ifndef THETA_INTERSECTION_HPP_ |
| #define THETA_INTERSECTION_HPP_ |
| |
| #include <memory> |
| #include <functional> |
| #include <climits> |
| |
| #include "theta_sketch.hpp" |
| #include "common_defs.hpp" |
| |
| namespace datasketches { |
| |
| /* |
| * author Alexander Saydakov |
| * author Lee Rhodes |
| * author Kevin Lang |
| */ |
| |
| template<typename A> |
| class theta_intersection_alloc { |
| public: |
| /** |
| * Creates an instance of the intersection with a given hash seed. |
| * @param seed hash seed |
| */ |
| explicit theta_intersection_alloc(uint64_t seed = DEFAULT_SEED); |
| |
| /** |
| * Updates the intersection with a given sketch. |
| * The intersection can be viewed as starting from the "universe" set, and every update |
| * can reduce the current set to leave the overlapping subset only. |
| * @param sketch represents input set for the intersection |
| */ |
| void update(const theta_sketch_alloc<A>& sketch); |
| |
| /** |
| * Produces a copy of the current state of the intersection. |
| * If update() was not called, the state is the infinite "universe", |
| * which is considered an undefined state, and throws an exception. |
| * @param ordered optional flag to specify if ordered sketch should be produced |
| * @return the result of the intersection |
| */ |
| compact_theta_sketch_alloc<A> get_result(bool ordered = true) const; |
| |
| /** |
| * Returns true if the state of the intersection is defined (not infinite "universe"). |
| * @return true if the state is valid |
| */ |
| bool has_result() const; |
| |
| private: |
| typedef typename std::allocator_traits<A>::template rebind_alloc<uint64_t> AllocU64; |
| bool is_valid_; |
| bool is_empty_; |
| uint64_t theta_; |
| uint8_t lg_size_; |
| vector_u64<A> keys_; |
| uint32_t num_keys_; |
| uint16_t seed_hash_; |
| }; |
| |
| // alias with default allocator for convenience |
| typedef theta_intersection_alloc<std::allocator<void>> theta_intersection; |
| |
| } /* namespace datasketches */ |
| |
| #include "theta_intersection_impl.hpp" |
| |
| # endif |