/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef LIBTEXTCLASSIFIER_UTILS_VARIANT_H_
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#define LIBTEXTCLASSIFIER_UTILS_VARIANT_H_
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#include <map>
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#include <string>
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#include "utils/base/integral_types.h"
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#include "utils/base/logging.h"
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#include "utils/strings/stringpiece.h"
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namespace libtextclassifier3 {
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// Represents a type-tagged union of different basic types.
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class Variant {
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public:
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enum Type {
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TYPE_EMPTY = 0,
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TYPE_INT_VALUE = 1,
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TYPE_INT64_VALUE = 2,
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TYPE_FLOAT_VALUE = 3,
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TYPE_DOUBLE_VALUE = 4,
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TYPE_BOOL_VALUE = 5,
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TYPE_STRING_VALUE = 6,
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};
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Variant() : type_(TYPE_EMPTY) {}
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explicit Variant(const int value)
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: type_(TYPE_INT_VALUE), int_value_(value) {}
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explicit Variant(const int64 value)
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: type_(TYPE_INT64_VALUE), long_value_(value) {}
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explicit Variant(const float value)
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: type_(TYPE_FLOAT_VALUE), float_value_(value) {}
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explicit Variant(const double value)
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: type_(TYPE_DOUBLE_VALUE), double_value_(value) {}
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explicit Variant(const StringPiece value)
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: type_(TYPE_STRING_VALUE), string_value_(value.ToString()) {}
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explicit Variant(const std::string value)
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: type_(TYPE_STRING_VALUE), string_value_(value) {}
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explicit Variant(const char* value)
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: type_(TYPE_STRING_VALUE), string_value_(value) {}
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explicit Variant(const bool value)
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: type_(TYPE_BOOL_VALUE), bool_value_(value) {}
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Variant& operator=(const Variant&) = default;
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int IntValue() const {
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TC3_CHECK(HasInt());
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return int_value_;
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}
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int64 Int64Value() const {
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TC3_CHECK(HasInt64());
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return long_value_;
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}
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float FloatValue() const {
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TC3_CHECK(HasFloat());
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return float_value_;
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}
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double DoubleValue() const {
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TC3_CHECK(HasDouble());
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return double_value_;
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}
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bool BoolValue() const {
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TC3_CHECK(HasBool());
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return bool_value_;
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}
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const std::string& StringValue() const {
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TC3_CHECK(HasString());
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return string_value_;
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}
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bool HasInt() const { return type_ == TYPE_INT_VALUE; }
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bool HasInt64() const { return type_ == TYPE_INT64_VALUE; }
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bool HasFloat() const { return type_ == TYPE_FLOAT_VALUE; }
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bool HasDouble() const { return type_ == TYPE_DOUBLE_VALUE; }
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bool HasBool() const { return type_ == TYPE_BOOL_VALUE; }
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bool HasString() const { return type_ == TYPE_STRING_VALUE; }
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Type GetType() const { return type_; }
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bool HasValue() const { return type_ != TYPE_EMPTY; }
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private:
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Type type_;
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union {
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int int_value_;
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int64 long_value_;
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float float_value_;
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double double_value_;
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bool bool_value_;
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};
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std::string string_value_;
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};
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} // namespace libtextclassifier3
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#endif // LIBTEXTCLASSIFIER_UTILS_VARIANT_H_
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