1 /* 2 * Copyright (C) 2018 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 ART_LIBDEXFILE_DEX_CLASS_ITERATOR_H_ 18 #define ART_LIBDEXFILE_DEX_CLASS_ITERATOR_H_ 19 20 #include <android-base/logging.h> 21 22 namespace art { 23 24 class ClassAccessor; 25 class ClassIterator; 26 class DexFile; 27 28 // Holder class, used to construct ClassAccessors. 29 class ClassIteratorData { 30 public: ClassIteratorData(const DexFile & dex_file,uint32_t class_def_idx)31 ClassIteratorData(const DexFile& dex_file, uint32_t class_def_idx) 32 : dex_file_(dex_file), 33 class_def_idx_(class_def_idx) {} 34 35 private: 36 const DexFile& dex_file_; 37 uint32_t class_def_idx_ = 0u; 38 39 friend class ClassAccessor; 40 friend class ClassIterator; 41 }; 42 43 // Iterator for visiting classes in a Dex file. 44 class ClassIterator : public std::iterator<std::forward_iterator_tag, ClassIteratorData> { 45 public: 46 using value_type = std::iterator<std::forward_iterator_tag, ClassIteratorData>::value_type; 47 using difference_type = std::iterator<std::forward_iterator_tag, value_type>::difference_type; 48 ClassIterator(const DexFile & dex_file,uint32_t class_def_idx)49 ClassIterator(const DexFile& dex_file, uint32_t class_def_idx) 50 : data_(dex_file, class_def_idx) {} 51 52 // Value after modification. 53 ClassIterator& operator++() { 54 ++data_.class_def_idx_; 55 return *this; 56 } 57 58 // Value before modification. 59 ClassIterator operator++(int) { 60 ClassIterator temp = *this; 61 ++*this; 62 return temp; 63 } 64 65 const value_type& operator*() const { 66 return data_; 67 } 68 69 bool operator==(const ClassIterator& rhs) const { 70 DCHECK_EQ(&data_.dex_file_, &rhs.data_.dex_file_) << "Comparing different dex files."; 71 return data_.class_def_idx_ == rhs.data_.class_def_idx_; 72 } 73 74 bool operator!=(const ClassIterator& rhs) const { 75 return !(*this == rhs); 76 } 77 78 bool operator<(const ClassIterator& rhs) const { 79 DCHECK_EQ(&data_.dex_file_, &rhs.data_.dex_file_) << "Comparing different dex files."; 80 return data_.class_def_idx_ < rhs.data_.class_def_idx_; 81 } 82 83 bool operator>(const ClassIterator& rhs) const { 84 return rhs < *this; 85 } 86 87 bool operator<=(const ClassIterator& rhs) const { 88 return !(rhs < *this); 89 } 90 91 bool operator>=(const ClassIterator& rhs) const { 92 return !(*this < rhs); 93 } 94 95 protected: 96 ClassIteratorData data_; 97 }; 98 99 } // namespace art 100 101 #endif // ART_LIBDEXFILE_DEX_CLASS_ITERATOR_H_ 102