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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/core/target_id_generator.h"
using firebase::firestore::model::TargetId;
namespace firebase {
namespace firestore {
namespace core {
TargetIdGenerator::TargetIdGenerator(const TargetIdGenerator& value)
: generator_id_(value.generator_id_), previous_id_(value.previous_id_) {
}
TargetIdGenerator::TargetIdGenerator(TargetIdGeneratorId generator_id,
TargetId after)
: generator_id_(generator_id) {
const TargetId after_without_generator = (after >> kReservedBits)
<< kReservedBits;
const TargetId after_generator = after - after_without_generator;
const TargetId generator = static_cast<TargetId>(generator_id);
if (after_generator >= generator) {
// For example, if:
// self.generatorID = 0b0000
// after = 0b1011
// afterGenerator = 0b0001
// Then:
// previous = 0b1010
// next = 0b1100
previous_id_ = after_without_generator | generator;
} else {
// For example, if:
// self.generatorID = 0b0001
// after = 0b1010
// afterGenerator = 0b0000
// Then:
// previous = 0b1001
// next = 0b1011
previous_id_ = (after_without_generator | generator) - (1 << kReservedBits);
}
}
TargetId TargetIdGenerator::NextId() {
previous_id_ += 1 << kReservedBits;
return previous_id_;
}
} // namespace core
} // namespace firestore
} // namespace firebase
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