| /* |
| * 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'); |
| |
| module.exports = class LongSerializer { |
| constructor(ioc) { |
| this.ioc = ioc; |
| this.ioc.serializers[ioc.DataType.LONG] = this; |
| } |
| |
| canBeUsedFor() { |
| // it's not expected to be used, see NumberSerializationStrategy |
| } |
| |
| serialize(item, fullyQualifiedFormat = true) { |
| if (item === undefined || item === null) { |
| if (fullyQualifiedFormat) { |
| return Buffer.from([this.ioc.DataType.LONG, 0x01]); |
| } |
| return Buffer.from([0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]); |
| } |
| |
| const bufs = []; |
| if (fullyQualifiedFormat) { |
| bufs.push(Buffer.from([this.ioc.DataType.LONG, 0x00])); |
| } |
| const v = Buffer.alloc(8); |
| v.writeBigInt64BE(BigInt(item)); |
| bufs.push(v); |
| |
| 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.LONG) { |
| 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); |
| } |
| |
| if (cursor.length < 8) { |
| throw new Error('unexpected {value} length'); |
| } |
| len += 8; |
| |
| let v = cursor.readBigInt64BE(); |
| if (v < Number.MIN_SAFE_INTEGER || v > Number.MAX_SAFE_INTEGER) { |
| // TODO: It tries to keep the same contract as GraphSON LongSerializer provides. |
| // Is it still appropriate to do so? Should we consider LongSerializerNg? |
| v = parseFloat(v.toString()); |
| } else { |
| v = Number(v); |
| } |
| |
| return { v, len }; |
| } catch (err) { |
| throw this.ioc.utils.des_error({ serializer: this, args: arguments, cursor, err }); |
| } |
| } |
| }; |