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/*
* Copyright 2018 Google
*
* Licensed 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.
*/
#include "Firestore/core/src/firebase/firestore/model/field_value.h"
#include <algorithm>
#include <memory>
#include <utility>
#include <vector>
#include "Firestore/core/src/firebase/firestore/util/firebase_assert.h"
namespace firebase {
namespace firestore {
namespace model {
using Type = FieldValue::Type;
namespace {
/**
* This deviates from the other platforms that define TypeOrder. Since
* we already define Type for union types, we use it together with this
* function to achive the equivalent order of types i.e.
* i) if two types are comparable, then they are of equal order;
* ii) otherwise, their order is the same as the order of their Type.
*/
bool Comparable(Type lhs, Type rhs) {
switch (lhs) {
case Type::Long:
case Type::Double:
return rhs == Type::Long || rhs == Type::Double;
case Type::Timestamp:
case Type::ServerTimestamp:
return rhs == Type::Timestamp || rhs == Type::ServerTimestamp;
default:
return lhs == rhs;
}
}
} // namespace
FieldValue::FieldValue(const FieldValue& value) {
*this = value;
}
FieldValue::FieldValue(FieldValue&& value) {
*this = std::move(value);
}
FieldValue::~FieldValue() {
SwitchTo(Type::Null);
}
FieldValue& FieldValue::operator=(const FieldValue& value) {
SwitchTo(value.tag_);
switch (tag_) {
case Type::Null:
break;
case Type::Boolean:
boolean_value_ = value.boolean_value_;
break;
case Type::Array: {
// copy-and-swap
std::vector<const FieldValue> tmp = value.array_value_;
std::swap(array_value_, tmp);
break;
}
default:
FIREBASE_ASSERT_MESSAGE_WITH_EXPRESSION(
false, lhs.type(), "Unsupported type %d", value.type());
}
return *this;
}
FieldValue& FieldValue::operator=(FieldValue&& value) {
switch (value.tag_) {
case Type::Array:
SwitchTo(Type::Array);
std::swap(array_value_, value.array_value_);
return *this;
default:
// We just copy over POD union types.
return *this = value;
}
}
const FieldValue& FieldValue::NullValue() {
static const FieldValue kNullInstance;
return kNullInstance;
}
const FieldValue& FieldValue::TrueValue() {
static const FieldValue kTrueInstance(true);
return kTrueInstance;
}
const FieldValue& FieldValue::FalseValue() {
static const FieldValue kFalseInstance(false);
return kFalseInstance;
}
const FieldValue& FieldValue::BooleanValue(bool value) {
return value ? TrueValue() : FalseValue();
}
FieldValue FieldValue::ArrayValue(const std::vector<const FieldValue>& value) {
std::vector<const FieldValue> copy(value);
return ArrayValue(std::move(copy));
}
FieldValue FieldValue::ArrayValue(std::vector<const FieldValue>&& value) {
FieldValue result;
result.SwitchTo(Type::Array);
std::swap(result.array_value_, value);
return result;
}
bool operator<(const FieldValue& lhs, const FieldValue& rhs) {
if (!Comparable(lhs.type(), rhs.type())) {
return lhs.type() < rhs.type();
}
switch (lhs.type()) {
case Type::Null:
return false;
case Type::Boolean:
// lhs < rhs iff lhs == false and rhs == true.
return !lhs.boolean_value_ && rhs.boolean_value_;
case Type::Array:
return lhs.array_value_ < rhs.array_value_;
default:
FIREBASE_ASSERT_MESSAGE_WITH_EXPRESSION(
false, lhs.type(), "Unsupported type %d", lhs.type());
// return false if assertion does not abort the program. We will say
// each unsupported type takes only one value thus everything is equal.
return false;
}
}
void FieldValue::SwitchTo(const Type type) {
if (tag_ == type) {
return;
}
// Not same type. Destruct old type first and then initialize new type.
// Must call destructor explicitly for any non-POD type.
switch (tag_) {
case Type::Array:
array_value_.~vector();
break;
default: {} // The other types where there is nothing to worry about.
}
tag_ = type;
// Must call constructor explicitly for any non-POD type to initialize.
switch (tag_) {
case Type::Array:
new (&array_value_) std::vector<const FieldValue>();
break;
default: {} // The other types where there is nothing to worry about.
}
}
} // namespace model
} // namespace firestore
} // namespace firebase
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