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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/precondition.h"
#include "Firestore/core/src/firebase/firestore/model/maybe_document.h"
#include "Firestore/core/src/firebase/firestore/model/snapshot_version.h"
#include "Firestore/core/src/firebase/firestore/util/hard_assert.h"
namespace firebase {
namespace firestore {
namespace model {
Precondition::Precondition(Type type, SnapshotVersion update_time, bool exists)
: type_(type), update_time_(std::move(update_time)), exists_(exists) {
}
/* static */
Precondition Precondition::Exists(bool exists) {
return Precondition{Type::Exists, SnapshotVersion::None(), exists};
}
/* static */
Precondition Precondition::UpdateTime(SnapshotVersion update_time) {
// update_time could be SnapshotVersion::None() in particular for locally
// deleted documents.
return Precondition{Type::UpdateTime, std::move(update_time), false};
}
/* static */
Precondition Precondition::None() {
return Precondition{Type::None, SnapshotVersion::None(), false};
}
bool Precondition::IsValidFor(const MaybeDocument& maybe_doc) const {
switch (type_) {
case Type::UpdateTime:
return maybe_doc.type() == MaybeDocument::Type::Document &&
maybe_doc.version() == update_time_;
case Type::Exists:
if (exists_) {
return maybe_doc.type() == MaybeDocument::Type::Document;
} else {
return maybe_doc.type() == MaybeDocument::Type::NoDocument;
}
case Type::None:
return true;
}
UNREACHABLE();
}
} // namespace model
} // namespace firestore
} // namespace firebase
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