| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| /** |
| * @author Igor Ostapenko |
| */ |
| 'use strict'; |
| |
| const { Buffer } = require('buffer'); |
| const g = require('../../../graph'); |
| |
| module.exports = class PathSerializer { |
| constructor(ioc) { |
| this.ioc = ioc; |
| this.ioc.serializers[ioc.DataType.PATH] = this; |
| } |
| |
| canBeUsedFor(value) { |
| return value instanceof g.Path; |
| } |
| |
| serialize(item, fullyQualifiedFormat = true) { |
| if (item === undefined || item === null) { |
| if (fullyQualifiedFormat) { |
| return Buffer.from([this.ioc.DataType.PATH, 0x01]); |
| } |
| return Buffer.concat([ |
| this.ioc.listSerializer.serialize([]), // {labels}=[] |
| this.ioc.listSerializer.serialize([]), // {objects}=[] |
| ]); |
| } |
| |
| const bufs = []; |
| if (fullyQualifiedFormat) { |
| bufs.push(Buffer.from([this.ioc.DataType.PATH, 0x00])); |
| } |
| |
| // {labels} is a List in which each item is a Set of String |
| bufs.push(this.ioc.listSerializer.serialize(item.labels)); |
| |
| // {objects} is a List of fully qualified typed values |
| bufs.push(this.ioc.listSerializer.serialize(item.objects)); |
| |
| return Buffer.concat(bufs); |
| } |
| |
| deserialize(buffer, fullyQualifiedFormat = true) { |
| let len = 0; |
| let cursor = buffer; |
| |
| try { |
| if (buffer === undefined || buffer === null || !(buffer instanceof Buffer)) { |
| throw new Error('buffer is missing'); |
| } |
| if (buffer.length < 1) { |
| throw new Error('buffer is empty'); |
| } |
| |
| if (fullyQualifiedFormat) { |
| const type_code = cursor.readUInt8(); |
| len++; |
| if (type_code !== this.ioc.DataType.PATH) { |
| throw new Error('unexpected {type_code}'); |
| } |
| cursor = cursor.slice(1); |
| |
| if (cursor.length < 1) { |
| throw new Error('{value_flag} is missing'); |
| } |
| const value_flag = cursor.readUInt8(); |
| len++; |
| if (value_flag === 1) { |
| return { v: null, len }; |
| } |
| if (value_flag !== 0) { |
| throw new Error('unexpected {value_flag}'); |
| } |
| cursor = cursor.slice(1); |
| } |
| |
| let labels, labels_len; |
| try { |
| ({ v: labels, len: labels_len } = this.ioc.listSerializer.deserialize(cursor)); |
| len += labels_len; |
| } catch (err) { |
| err.message = '{labels}: ' + err.message; |
| throw err; |
| } |
| // TODO: should we check content of labels to make sure it's List< Set<String> > ? |
| cursor = cursor.slice(labels_len); |
| |
| let objects, objects_len; |
| try { |
| ({ v: objects, len: objects_len } = this.ioc.listSerializer.deserialize(cursor)); |
| len += objects_len; |
| } catch (err) { |
| err.message = '{objects}: ' + err.message; |
| throw err; |
| } |
| cursor = cursor.slice(objects_len); |
| |
| const v = new g.Path(labels, objects); |
| return { v, len }; |
| } catch (err) { |
| throw this.ioc.utils.des_error({ serializer: this, args: arguments, cursor, err }); |
| } |
| } |
| }; |