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 LIBTEXTCLASSIFIER_UTILS_VARIANT_H_ 18 #define LIBTEXTCLASSIFIER_UTILS_VARIANT_H_ 19 20 #include <map> 21 #include <string> 22 23 #include "utils/base/integral_types.h" 24 #include "utils/base/logging.h" 25 #include "utils/strings/stringpiece.h" 26 27 namespace libtextclassifier3 { 28 29 // Represents a type-tagged union of different basic types. 30 class Variant { 31 public: 32 enum Type { 33 TYPE_EMPTY = 0, 34 TYPE_INT_VALUE = 1, 35 TYPE_INT64_VALUE = 2, 36 TYPE_FLOAT_VALUE = 3, 37 TYPE_DOUBLE_VALUE = 4, 38 TYPE_BOOL_VALUE = 5, 39 TYPE_STRING_VALUE = 6, 40 }; 41 Variant()42 Variant() : type_(TYPE_EMPTY) {} Variant(const int value)43 explicit Variant(const int value) 44 : type_(TYPE_INT_VALUE), int_value_(value) {} Variant(const int64 value)45 explicit Variant(const int64 value) 46 : type_(TYPE_INT64_VALUE), long_value_(value) {} Variant(const float value)47 explicit Variant(const float value) 48 : type_(TYPE_FLOAT_VALUE), float_value_(value) {} Variant(const double value)49 explicit Variant(const double value) 50 : type_(TYPE_DOUBLE_VALUE), double_value_(value) {} Variant(const StringPiece value)51 explicit Variant(const StringPiece value) 52 : type_(TYPE_STRING_VALUE), string_value_(value.ToString()) {} Variant(const std::string value)53 explicit Variant(const std::string value) 54 : type_(TYPE_STRING_VALUE), string_value_(value) {} Variant(const char * value)55 explicit Variant(const char* value) 56 : type_(TYPE_STRING_VALUE), string_value_(value) {} Variant(const bool value)57 explicit Variant(const bool value) 58 : type_(TYPE_BOOL_VALUE), bool_value_(value) {} 59 60 Variant& operator=(const Variant&) = default; 61 IntValue()62 int IntValue() const { 63 TC3_CHECK(HasInt()); 64 return int_value_; 65 } 66 Int64Value()67 int64 Int64Value() const { 68 TC3_CHECK(HasInt64()); 69 return long_value_; 70 } 71 FloatValue()72 float FloatValue() const { 73 TC3_CHECK(HasFloat()); 74 return float_value_; 75 } 76 DoubleValue()77 double DoubleValue() const { 78 TC3_CHECK(HasDouble()); 79 return double_value_; 80 } 81 BoolValue()82 bool BoolValue() const { 83 TC3_CHECK(HasBool()); 84 return bool_value_; 85 } 86 StringValue()87 const std::string& StringValue() const { 88 TC3_CHECK(HasString()); 89 return string_value_; 90 } 91 HasInt()92 bool HasInt() const { return type_ == TYPE_INT_VALUE; } 93 HasInt64()94 bool HasInt64() const { return type_ == TYPE_INT64_VALUE; } 95 HasFloat()96 bool HasFloat() const { return type_ == TYPE_FLOAT_VALUE; } 97 HasDouble()98 bool HasDouble() const { return type_ == TYPE_DOUBLE_VALUE; } 99 HasBool()100 bool HasBool() const { return type_ == TYPE_BOOL_VALUE; } 101 HasString()102 bool HasString() const { return type_ == TYPE_STRING_VALUE; } 103 GetType()104 Type GetType() const { return type_; } 105 HasValue()106 bool HasValue() const { return type_ != TYPE_EMPTY; } 107 108 private: 109 Type type_; 110 union { 111 int int_value_; 112 int64 long_value_; 113 float float_value_; 114 double double_value_; 115 bool bool_value_; 116 }; 117 std::string string_value_; 118 }; 119 120 } // namespace libtextclassifier3 121 122 #endif // LIBTEXTCLASSIFIER_UTILS_VARIANT_H_ 123