56 lines
1.9 KiB
Rust
56 lines
1.9 KiB
Rust
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// Copyright 2018 Mozilla
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
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// this file except in compliance with the License. You may obtain a copy of the
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// License at http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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extern crate edn;
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use edn::entities::{
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AttributePlace,
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EntityPlace,
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EntidOrIdent,
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ValuePlace,
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TransactableValueMarker,
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};
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/// Represents one entid in the entid space.
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///
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/// Per https://www.sqlite.org/datatype3.html (see also http://stackoverflow.com/a/8499544), SQLite
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/// stores signed integers up to 64 bits in size. Since u32 is not appropriate for our use case, we
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/// use i64 rather than manually truncating u64 to u63 and casting to i64 throughout the codebase.
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pub type Entid = i64;
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/// An entid that's either already in the store, or newly allocated to a tempid.
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/// TODO: we'd like to link this in some way to the lifetime of a particular PartitionMap.
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#[derive(Clone, Copy, Debug, Hash, Eq, PartialEq, Ord, PartialOrd)]
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pub struct KnownEntid(pub Entid);
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impl From<KnownEntid> for Entid {
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fn from(k: KnownEntid) -> Entid {
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k.0
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}
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}
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impl<V: TransactableValueMarker> Into<EntityPlace<V>> for KnownEntid {
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fn into(self) -> EntityPlace<V> {
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EntityPlace::Entid(EntidOrIdent::Entid(self.0))
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}
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}
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impl Into<AttributePlace> for KnownEntid {
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fn into(self) -> AttributePlace {
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AttributePlace::Entid(EntidOrIdent::Entid(self.0))
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}
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}
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impl<V: TransactableValueMarker> Into<ValuePlace<V>> for KnownEntid {
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fn into(self) -> ValuePlace<V> {
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ValuePlace::Entid(EntidOrIdent::Entid(self.0))
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}
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}
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