deserialize()

in gremlin-javascript/src/main/javascript/gremlin-javascript/lib/structure/io/binary/internals/MapSerializer.js [77:153]

• 69 lines of code
• 16 McCabe index (conditional complexity)

  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.MAP) {
          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 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);

      const v = new Map();
      for (let i = 0; i < length; i++) {
        let key, key_len;
        try {
          ({ v: key, len: key_len } = this.ioc.anySerializer.deserialize(cursor));
          len += key_len;
        } catch (err) {
          err.message = `{item_${i}} key: ` + err.message;
          throw err;
        }
        cursor = cursor.slice(key_len);

        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);

        v.set(key, value);
      }

      return { v, len };
    } catch (err) {
      throw this.ioc.utils.des_error({ serializer: this, args: arguments, cursor, err });
    }
  }