| /* |
| * 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 |
| */ |
| |
| import { Buffer } from 'buffer'; |
| import { VertexProperty } from '../../../graph.js'; |
| |
| export default class VertexPropertySerializer { |
| constructor(ioc) { |
| this.ioc = ioc; |
| this.ioc.serializers[ioc.DataType.VERTEXPROPERTY] = this; |
| } |
| |
| canBeUsedFor(value) { |
| return value instanceof VertexProperty; |
| } |
| |
| serialize(item, fullyQualifiedFormat = true) { |
| if (item === undefined || item === null) { |
| if (fullyQualifiedFormat) { |
| return Buffer.from([this.ioc.DataType.VERTEXPROPERTY, 0x01]); |
| } |
| return Buffer.concat([ |
| this.ioc.unspecifiedNullSerializer.serialize(null), // {id}=null |
| this.ioc.stringSerializer.serialize('', false), // {label}='' |
| this.ioc.unspecifiedNullSerializer.serialize(null), // {value}=null |
| this.ioc.unspecifiedNullSerializer.serialize(null), // {parent}=null |
| this.ioc.unspecifiedNullSerializer.serialize(null), // {properties}=null |
| ]); |
| } |
| |
| const bufs = []; |
| if (fullyQualifiedFormat) { |
| bufs.push(Buffer.from([this.ioc.DataType.VERTEXPROPERTY, 0x00])); |
| } |
| |
| // {id} |
| bufs.push(this.ioc.anySerializer.serialize(item.id)); |
| |
| // {label} |
| bufs.push(this.ioc.stringSerializer.serialize(item.label, false)); |
| |
| // {value} |
| bufs.push(this.ioc.anySerializer.serialize(item.value)); |
| |
| // {parent} |
| bufs.push(this.ioc.unspecifiedNullSerializer.serialize(null)); |
| |
| // {properties} |
| bufs.push(this.ioc.anySerializer.serialize(item.properties)); |
| |
| 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.VERTEXPROPERTY) { |
| 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); |
| } |
| |
| // {id} is a fully qualified typed value composed of {type_code}{type_info}{value_flag}{value} |
| let id, id_len; |
| try { |
| ({ v: id, len: id_len } = this.ioc.anySerializer.deserialize(cursor)); |
| len += id_len; |
| } catch (err) { |
| err.message = '{id}: ' + err.message; |
| throw err; |
| } |
| cursor = cursor.slice(id_len); |
| |
| // {label} is a String value |
| let label, label_len; |
| try { |
| ({ v: label, len: label_len } = this.ioc.stringSerializer.deserialize(cursor, false)); |
| len += label_len; |
| } catch (err) { |
| err.message = '{label}: ' + err.message; |
| throw err; |
| } |
| cursor = cursor.slice(label_len); |
| |
| // {value} is a fully qualified typed value composed of {type_code}{type_info}{value_flag}{value} |
| let value, value_len; |
| try { |
| ({ v: value, len: value_len } = this.ioc.anySerializer.deserialize(cursor)); |
| len += value_len; |
| } catch (err) { |
| err.message = '{value}: ' + err.message; |
| throw err; |
| } |
| cursor = cursor.slice(value_len); |
| |
| // {parent} is a fully qualified typed value composed of {type_code}{type_info}{value_flag}{value} which contains the parent Vertex. |
| // Note that as TinkerPop currently send "references" only, this value will always be null. |
| let parent_len; |
| try { |
| ({ len: parent_len } = this.ioc.unspecifiedNullSerializer.deserialize(cursor)); |
| len += parent_len; |
| } catch (err) { |
| err.message = '{parent}: ' + err.message; |
| throw err; |
| } |
| // TODO: should we verify that parent is null? |
| cursor = cursor.slice(parent_len); |
| |
| // {properties} is a fully qualified typed value composed of {type_code}{type_info}{value_flag}{value} which contains properties. Note that as TinkerPop currently send "references" only, this value will always be null. |
| let properties, properties_len; |
| try { |
| ({ v: properties, len: properties_len } = this.ioc.anySerializer.deserialize(cursor)); |
| len += properties_len; |
| } catch (err) { |
| err.message = '{properties}: ' + err.message; |
| throw err; |
| } |
| // TODO: should we verify that properties is null? |
| cursor = cursor.slice(properties_len); |
| |
| const v = new VertexProperty(id, label, value, properties); |
| return { v, len }; |
| } catch (err) { |
| throw this.ioc.utils.des_error({ serializer: this, args: arguments, cursor, err }); |
| } |
| } |
| } |