1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef AAPT2_FILTER_H 18 #define AAPT2_FILTER_H 19 20 #include <string> 21 #include <vector> 22 23 #include "util/Util.h" 24 25 namespace aapt { 26 27 /** A filter to be applied to a path segment. */ 28 class IPathFilter { 29 public: 30 virtual ~IPathFilter() = default; 31 32 /** Returns true if the path should be kept. */ 33 virtual bool Keep(const std::string& path) = 0; 34 }; 35 36 /** 37 * Path filter that keeps anything that matches the provided prefix. 38 */ 39 class PrefixFilter : public IPathFilter { 40 public: 41 explicit PrefixFilter(std::string prefix) : prefix_(std::move(prefix)) { 42 } 43 44 /** Returns true if the provided path matches the prefix. */ 45 bool Keep(const std::string& path) override { 46 return util::StartsWith(path, prefix_); 47 } 48 49 private: 50 const std::string prefix_; 51 }; 52 53 /** Applies a set of IPathFilters to a path and returns true iif all filters keep the path. */ 54 class FilterChain : public IPathFilter { 55 public: 56 /** Adds a filter to the list to be applied to each path. */ 57 void AddFilter(std::unique_ptr<IPathFilter> filter) { 58 filters_.push_back(std::move(filter)); 59 } 60 61 /** Returns true if all filters keep the path. */ 62 bool Keep(const std::string& path) override { 63 for (auto& filter : filters_) { 64 if (!filter->Keep(path)) { 65 return false; 66 } 67 } 68 return true; 69 } 70 71 private: 72 std::vector<std::unique_ptr<IPathFilter>> filters_; 73 }; 74 75 } // namespace aapt 76 77 #endif // AAPT2_FILTER_H 78
