72 lines
2.1 KiB
TypeScript
72 lines
2.1 KiB
TypeScript
/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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import {KeyLimits} from "../../storage/common";
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import {Direction} from "./Direction";
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// key for events in the timelineEvents store
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export class EventKey {
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constructor(
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public fragmentId: number,
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public eventIndex: number
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) {
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}
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nextFragmentKey(): EventKey {
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// could take MIN_EVENT_INDEX here if it can't be paged back
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return new EventKey(this.fragmentId + 1, KeyLimits.middleStorageKey);
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}
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nextKeyForDirection(direction: Direction): EventKey {
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if (direction.isForward) {
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return this.nextKey();
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} else {
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return this.previousKey();
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}
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}
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previousKey(): EventKey {
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return new EventKey(this.fragmentId, this.eventIndex - 1);
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}
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nextKey(): EventKey {
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return new EventKey(this.fragmentId, this.eventIndex + 1);
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}
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static get maxKey(): EventKey {
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return new EventKey(KeyLimits.maxStorageKey, KeyLimits.maxStorageKey);
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}
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static get minKey(): EventKey {
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return new EventKey(KeyLimits.minStorageKey, KeyLimits.minStorageKey);
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}
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static get defaultLiveKey(): EventKey {
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return EventKey.defaultFragmentKey(KeyLimits.minStorageKey);
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}
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static defaultFragmentKey(fragmentId: number): EventKey {
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return new EventKey(fragmentId, KeyLimits.middleStorageKey);
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}
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toString(): string {
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return `[${this.fragmentId}/${this.eventIndex}]`;
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}
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equals(other: EventKey): boolean {
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return this.fragmentId === other?.fragmentId && this.eventIndex === other?.eventIndex;
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}
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}
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