118 lines
3.0 KiB
JavaScript
118 lines
3.0 KiB
JavaScript
/*
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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 {BaseEntry} from "./BaseEntry.js";
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import {Direction} from "../Direction.js";
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import {isValidFragmentId} from "../common.js";
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import {Platform} from "../../../../Platform.js";
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export class FragmentBoundaryEntry extends BaseEntry {
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constructor(fragment, isFragmentStart, fragmentIdComparer) {
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super(fragmentIdComparer);
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this._fragment = fragment;
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// TODO: should isFragmentStart be Direction instead of bool?
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this._isFragmentStart = isFragmentStart;
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}
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static start(fragment, fragmentIdComparer) {
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return new FragmentBoundaryEntry(fragment, true, fragmentIdComparer);
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}
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static end(fragment, fragmentIdComparer) {
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return new FragmentBoundaryEntry(fragment, false, fragmentIdComparer);
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}
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get started() {
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return this._isFragmentStart;
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}
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get hasEnded() {
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return !this.started;
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}
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get fragment() {
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return this._fragment;
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}
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get fragmentId() {
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return this._fragment.id;
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}
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get entryIndex() {
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if (this.started) {
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return Platform.minStorageKey;
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} else {
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return Platform.maxStorageKey;
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}
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}
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get isGap() {
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return !!this.token;
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}
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get token() {
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if (this.started) {
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return this.fragment.previousToken;
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} else {
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return this.fragment.nextToken;
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}
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}
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set token(token) {
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if (this.started) {
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this.fragment.previousToken = token;
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} else {
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this.fragment.nextToken = token;
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}
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}
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get linkedFragmentId() {
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if (this.started) {
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return this.fragment.previousId;
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} else {
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return this.fragment.nextId;
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}
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}
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set linkedFragmentId(id) {
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if (this.started) {
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this.fragment.previousId = id;
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} else {
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this.fragment.nextId = id;
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}
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}
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get hasLinkedFragment() {
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return isValidFragmentId(this.linkedFragmentId);
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}
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get direction() {
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if (this.started) {
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return Direction.Backward;
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} else {
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return Direction.Forward;
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}
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}
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withUpdatedFragment(fragment) {
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return new FragmentBoundaryEntry(fragment, this._isFragmentStart, this._fragmentIdComparer);
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}
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createNeighbourEntry(neighbour) {
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return new FragmentBoundaryEntry(neighbour, !this._isFragmentStart, this._fragmentIdComparer);
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}
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}
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