| /* |
| * 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 BulkSetSerializer { |
| constructor(ioc) { |
| this.ioc = ioc; |
| this.ioc.serializers[ioc.DataType.BULKSET] = this; |
| } |
| |
| 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.BULKSET) { |
| 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); |
| } |
| |
| // {length} |
| let length, length_len; |
| try { |
| ({ v: length, len: length_len } = this.ioc.intSerializer.deserialize(cursor, false)); |
| len += length_len; |
| } catch (err) { |
| err.message = '{length}: ' + err.message; |
| throw err; |
| } |
| if (length < 0) { |
| throw new Error('{length} is less than zero'); |
| } |
| cursor = cursor.slice(length_len); |
| |
| // Official GraphBinary 1.0 spec: |
| // If the implementing language does not have a BulkSet object to deserialize into, |
| // this format can be coerced to a List and still be considered compliant with Gremlin. |
| // Simply "expand the bulk" by adding the item to the List the number of times specified by the bulk. |
| |
| // {item_0}...{item_n} |
| let v = new Array(); |
| for (let i = 0; i < length; i++) { |
| let value, value_len; |
| try { |
| ({ v: value, len: value_len } = this.ioc.anySerializer.deserialize(cursor)); |
| len += value_len; |
| } catch (err) { |
| err.message = `{item_${i}} value: ` + err.message; |
| throw err; |
| } |
| cursor = cursor.slice(value_len); |
| |
| let bulk, bulk_len; |
| try { |
| ({ v: bulk, len: bulk_len } = this.ioc.longSerializer.deserialize(cursor, false)); |
| len += bulk_len; |
| } catch (err) { |
| err.message = `{item_${i}} bulk: ` + err.message; |
| throw err; |
| } |
| if (bulk < 0) { |
| throw new Error(`{item_${i}}: bulk is less than zero`); |
| } |
| if (bulk > 4294967295) { |
| // arrayLength of Array() constructor is expected to be an integer between 0 and 2^32 - 1 |
| throw new Error(`{item_${i}}: bulk is greater than 2^32-1`); |
| } |
| cursor = cursor.slice(bulk_len); |
| |
| bulk = Number(bulk); // coersion to Number is required for BigInt if LongSerializerNg is used |
| const item = new Array(bulk).fill(value); |
| v = v.concat(item); |
| } |
| |
| return { v, len }; |
| } catch (err) { |
| throw this.ioc.utils.des_error({ serializer: this, args: arguments, cursor, err }); |
| } |
| } |
| }; |