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{ Observable } from 'rxjs/Observable'\nimport { empty } from 'rxjs/observable/empty'\nimport { publishReplay } from 'rxjs/operator/publishReplay'\nimport { scan } from 'rxjs/operator/scan'\nimport { filter } from 'rxjs/operator/filter'\nimport { map } from 'rxjs/operator/map'\n\nimport snakeCase from 'snake-case'\n\nimport checkArgs from './util/check-args'\nimport validIndexValue from './util/valid-index-value.js'\nimport { serialize } from './serialization.js'\n\n\n/**\n @this TermBase\n\n Validation check to throw an exception if a method is chained onto a\n query that already has it. It belongs to TermBase, but we don't want\n to pollute the objects with it (since it isn't useful to api users),\n so it's dynamically bound with :: inside methods that use it.\n*/\nfunction checkIfLegalToChain(key) {\n if (this._legalMethods.indexOf(key) === -1) {\n throw new Error(`${key} cannot be called on the current query`)\n }\n if (snakeCase(key) in this._query) {\n throw new Error(`${key} has already been called on this query`)\n }\n}\n\n// Abstract base class for terms\nclass TermBase {\n constructor(sendRequest, query, legalMethods) {\n this._sendRequest = sendRequest\n this._query = query\n this._legalMethods = legalMethods\n }\n // Returns a sequence of the result set. Every time it changes the\n // updated sequence will be emitted. If raw change objects are\n // needed, pass the option 'rawChanges: true'. An observable is\n // returned which will lazily emit the query when it is subscribed\n // to\n watch({ rawChanges = false } = {}) {\n const raw = this._sendRequest('subscribe', this._query)\n if (rawChanges) {\n return raw\n } else {\n return makePresentable(raw, this._query)\n }\n }\n // Grab a snapshot of the current query (non-changefeed). Emits an\n // array with all results. An observable is returned which will\n // lazily emit the query when subscribed to\n fetch() {\n return this._sendRequest('query', this._query)\n }\n findAll(...fieldValues) {\n this::checkIfLegalToChain('findAll')\n checkArgs('findAll', arguments, { maxArgs: 100 })\n return new FindAll(this._sendRequest, this._query, fieldValues)\n }\n find(idOrObject) {\n this::checkIfLegalToChain('find')\n checkArgs('find', arguments)\n return new Find(this._sendRequest, this._query, idOrObject)\n }\n order(fields, direction = 'ascending') {\n this::checkIfLegalToChain('order')\n checkArgs('order', arguments, { minArgs: 1, maxArgs: 2 })\n return new Order(this._sendRequest, this._query, fields, direction)\n }\n above(aboveSpec, bound = 'closed') {\n this::checkIfLegalToChain('above')\n checkArgs('above', arguments, { minArgs: 1, maxArgs: 2 })\n return new Above(this._sendRequest, this._query, aboveSpec, bound)\n }\n below(belowSpec, bound = 'open') {\n this::checkIfLegalToChain('below')\n checkArgs('below', arguments, { minArgs: 1, maxArgs: 2 })\n return new Below(this._sendRequest, this._query, belowSpec, bound)\n }\n limit(size) {\n this::checkIfLegalToChain('limit')\n checkArgs('limit', arguments)\n return new Limit(this._sendRequest, this._query, size)\n }\n}\n\n// Turn a raw observable of server responses into user-presentable events\n//\n// `observable` is the base observable with full responses coming from\n// the HorizonSocket\n// `query` is the value of `options` in the request\nfunction makePresentable(observable, query) {\n // Whether the entire data structure is in each change\n const pointQuery = Boolean(query.find)\n\n if (pointQuery) {\n let hasEmitted = false\n const seedVal = null\n // Simplest case: just pass through new_val\n return observable\n ::filter(change => !hasEmitted || change.type !== 'state')\n ::scan((previous, change) => {\n hasEmitted = true\n if (change.state === 'synced') {\n return previous\n } else {\n return change.new_val\n }\n }, seedVal)\n } else {\n const seedVal = { emitted: false, val: [] }\n return observable\n ::scan((state, change) => {\n if (change.state === 'synced') {\n state.emitted = true\n }\n state.val = applyChange(state.val.slice(), change)\n return state\n }, seedVal)\n ::filter(state => state.emitted)\n ::map(x => x.val)\n }\n}\n\nfunction applyChange(arr, change) {\n switch (change.type) {\n case 'remove':\n case 'uninitial': {\n // Remove old values from the array\n if (change.old_offset != null) {\n arr.splice(change.old_offset, 1)\n } else {\n const index = arr.findIndex(x => x.id === change.old_val.id)\n arr.splice(index, 1)\n }\n break\n }\n case 'add':\n case 'initial': {\n // Add new values to the array\n if (change.new_offset != null) {\n // If we have an offset, put it in the correct location\n arr.splice(change.new_offset, 0, change.new_val)\n } else {\n // otherwise for unordered results, push it on the end\n arr.push(change.new_val)\n }\n break\n }\n case 'change': {\n // Modify 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wrappedDocs = [ documents ]\n } else if (documents.length === 0) {\n // Don't bother sending no-ops to the server\n return Observable::empty()\n }\n const options = Object.assign(\n {}, this._query, { data: serialize(wrappedDocs) })\n let observable = this._sendRequest(name, options)\n if (!this._lazyWrites) {\n // Need to buffer response since this becomes a hot observable and\n // when we subscribe matters\n observable = observable::publishReplay().refCount()\n observable.subscribe()\n }\n return observable\n}\n\nclass Collection extends TermBase {\n constructor(sendRequest, collectionName, lazyWrites) {\n const query = { collection: collectionName }\n const legalMethods = [\n 'find', 'findAll', 'justInitial', 'order', 'above', 'below', 'limit' ]\n super(sendRequest, query, legalMethods)\n this._lazyWrites = lazyWrites\n }\n store(documents) {\n return this::writeOp('store', arguments, documents)\n }\n upsert(documents) {\n return this::writeOp('upsert', arguments, documents)\n }\n insert(documents) {\n return this::writeOp('insert', arguments, documents)\n }\n replace(documents) {\n return this::writeOp('replace', arguments, documents)\n }\n update(documents) {\n return this::writeOp('update', arguments, documents)\n }\n remove(documentOrId) {\n const wrapped = validIndexValue(documentOrId) ?\n { id: documentOrId } : documentOrId\n return this::writeOp('remove', arguments, wrapped)\n }\n removeAll(documentsOrIds) {\n if (!Array.isArray(documentsOrIds)) {\n throw new Error('removeAll takes an array as an argument')\n }\n const wrapped = documentsOrIds.map(item => {\n if (validIndexValue(item)) {\n return { id: item }\n } else {\n return item\n }\n })\n return this::writeOp('removeAll', arguments, wrapped)\n }\n}\n\nclass Find extends TermBase {\n constructor(sendRequest, previousQuery, idOrObject) {\n const findObject = validIndexValue(idOrObject) ?\n { id: idOrObject } : idOrObject\n const query = Object.assign({}, previousQuery, { find: findObject })\n super(sendRequest, query, [])\n }\n}\n\nclass FindAll extends TermBase {\n constructor(sendRequest, previousQuery, fieldValues) {\n const wrappedFields = fieldValues\n .map(item => validIndexValue(item) ? { id: item } : item)\n const options = { find_all: wrappedFields }\n const findAllQuery = Object.assign({}, previousQuery, options)\n let legalMethods\n if (wrappedFields.length === 1) {\n legalMethods = [ 'order', 'above', 'below', 'limit' ]\n } else {\n // The vararg version of findAll cannot have anything chained to it\n legalMethods = []\n }\n super(sendRequest, findAllQuery, legalMethods)\n }\n}\n\nclass Above extends TermBase {\n constructor(sendRequest, previousQuery, aboveSpec, bound) {\n const option = { above: [ aboveSpec, bound ] }\n const query = Object.assign({}, previousQuery, option)\n const legalMethods = [ 'findAll', 'order', 'below', 'limit' ]\n super(sendRequest, query, legalMethods)\n }\n}\n\nclass Below extends TermBase {\n constructor(sendRequest, previousQuery, belowSpec, bound) {\n const options = { below: [ belowSpec, bound ] }\n const query = Object.assign({}, previousQuery, options)\n const legalMethods = [ 'findAll', 'order', 'above', 'limit' ]\n super(sendRequest, query, legalMethods)\n }\n}\n\nclass Order extends TermBase {\n constructor(sendRequest, previousQuery, fields, direction) {\n const wrappedFields = Array.isArray(fields) ? fields : [ fields ]\n const options = { order: [ wrappedFields, direction ] }\n const query = Object.assign({}, previousQuery, options)\n const legalMethods = [ 'findAll', 'above', 'below', 'limit' ]\n super(sendRequest, query, legalMethods)\n }\n}\n\nclass Limit extends TermBase {\n constructor(sendRequest, previousQuery, size) {\n const query = Object.assign({}, previousQuery, { limit: size })\n // Nothing is legal to chain after .limit\n super(sendRequest, query, [])\n }\n}\n\nmodule.exports = {\n TermBase,\n Collection,\n FindAll,\n Find,\n Above,\n Below,\n Order,\n Limit,\n}\n"]} |