88 lines
2.1 KiB
JavaScript
88 lines
2.1 KiB
JavaScript
import * as I from 'immutable';
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import mapValues from 'lodash.mapvalues';
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import {create} from './index';
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export class EntityList {
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constructor() {
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this.entities_PRIVATE = {};
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this.state_PRIVATE = I.Map();
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this.uuidMap_PRIVATE = {};
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}
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*[Symbol.iterator]() {
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for (const uuid in this.entities_PRIVATE) {
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const entity = this.entities_PRIVATE[uuid];
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yield entity;
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}
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}
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acceptStateChange(change) {
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for (const uuid in change) {
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const localUuid = this.uuidMap_PRIVATE[uuid];
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const entity = this.entities_PRIVATE[localUuid];
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if (entity) {
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if (false === change[uuid]) {
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// Entity removed.
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this.removeEntity(entity);
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}
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else {
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entity.acceptStateChange(change[uuid]);
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this.state_PRIVATE = this.state_PRIVATE.set(localUuid, entity.state());
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}
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}
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else {
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// New entity. Create with change as traits' state.
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const traits = mapValues(change[uuid], (changeTraits) => ({
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state: changeTraits,
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}));
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const newEntity = create().fromJSON({traits});
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this.addEntity(newEntity);
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this.uuidMap_PRIVATE[uuid] = newEntity.instanceUuid;
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}
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}
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}
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addEntity(entity) {
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const uuid = entity.instanceUuid;
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this.entities_PRIVATE[uuid] = entity;
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this.state_PRIVATE = this.state_PRIVATE.set(uuid, entity.state());
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entity.on('destroyed', () => {
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this.removeEntity(entity);
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});
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}
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entity(uuid) {
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return this.entities_PRIVATE[uuid];
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}
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recomputeState() {
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for (const uuid in this.entities_PRIVATE) {
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const entity = this.entities_PRIVATE[uuid];
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this.state_PRIVATE = this.state_PRIVATE.set(uuid, entity.state());
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}
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}
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removeEntity(entity) {
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const uuid = entity.instanceUuid;
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delete this.entities_PRIVATE[uuid];
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this.state_PRIVATE = this.state_PRIVATE.delete(uuid);
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}
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state() {
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return this.state_PRIVATE;
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}
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tick(elapsed) {
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for (const uuid in this.entities_PRIVATE) {
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const entity = this.entities_PRIVATE[uuid];
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if ('tick' in entity) {
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entity.tick(elapsed);
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}
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}
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this.recomputeState();
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}
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}
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