| #region License |
| |
| /* |
| * 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. |
| */ |
| |
| #endregion |
| |
| using System.IO; |
| using System.Threading; |
| using System.Threading.Tasks; |
| |
| namespace Gremlin.Net.Structure.IO.GraphBinary.Types |
| { |
| /// <summary> |
| /// Base class for serialization of types that don't contain type specific information only {type_code}, |
| /// {value_flag} and {value}. |
| /// </summary> |
| /// <typeparam name="T">The supported type.</typeparam> |
| public abstract class SimpleTypeSerializer<T> : ITypeSerializer |
| { |
| /// <summary> |
| /// Initializes a new instance of the <see cref="SimpleTypeSerializer{T}" /> class. |
| /// </summary> |
| protected SimpleTypeSerializer(DataType dataType) |
| { |
| DataType = dataType; |
| } |
| |
| /// <inheritdoc /> |
| public DataType DataType { get; } |
| |
| /// <inheritdoc /> |
| public async Task WriteAsync(object value, Stream stream, GraphBinaryWriter writer, |
| CancellationToken cancellationToken = default) |
| { |
| await WriteValueAsync((T) value, stream, writer, true, cancellationToken).ConfigureAwait(false); |
| } |
| |
| /// <inheritdoc /> |
| public async Task WriteValueAsync(object value, Stream stream, GraphBinaryWriter writer, bool nullable, |
| CancellationToken cancellationToken = default) |
| { |
| if (value == null) |
| { |
| if (!nullable) |
| { |
| throw new IOException("Unexpected null value when nullable is false"); |
| } |
| |
| await writer.WriteValueFlagNullAsync(stream, cancellationToken).ConfigureAwait(false); |
| return; |
| } |
| |
| if (nullable) |
| { |
| await writer.WriteValueFlagNoneAsync(stream, cancellationToken).ConfigureAwait(false); |
| } |
| |
| await WriteValueAsync((T) value, stream, writer, cancellationToken).ConfigureAwait(false); |
| } |
| |
| /// <summary> |
| /// Writes a non-nullable value into a stream. |
| /// </summary> |
| /// <param name="value">The value to write.</param> |
| /// <param name="stream">The stream to write to.</param> |
| /// <param name="writer">A <see cref="GraphBinaryWriter"/>.</param> |
| /// <param name="cancellationToken">The token to cancel the operation. The default value is None.</param> |
| /// <returns>A task that represents the asynchronous write operation.</returns> |
| protected abstract Task WriteValueAsync(T value, Stream stream, GraphBinaryWriter writer, |
| CancellationToken cancellationToken = default); |
| |
| /// <inheritdoc /> |
| public async Task<object> ReadAsync(Stream stream, GraphBinaryReader reader, |
| CancellationToken cancellationToken = default) |
| { |
| return await ReadValueAsync(stream, reader, true, cancellationToken).ConfigureAwait(false); |
| } |
| |
| /// <inheritdoc /> |
| public async Task<object> ReadValueAsync(Stream stream, GraphBinaryReader reader, bool nullable, |
| CancellationToken cancellationToken = default) |
| { |
| if (nullable) |
| { |
| var valueFlag = await stream.ReadByteAsync(cancellationToken).ConfigureAwait(false); |
| if ((valueFlag & 1) == 1) |
| { |
| return null; |
| } |
| } |
| |
| return await ReadValueAsync(stream, reader, cancellationToken).ConfigureAwait(false); |
| } |
| |
| /// <summary> |
| /// Reads a non-nullable value according to the type format. |
| /// </summary> |
| /// <param name="stream">The GraphBinary data to parse.</param> |
| /// <param name="reader">A <see cref="GraphBinaryReader"/>.</param> |
| /// <param name="cancellationToken">The token to cancel the operation. The default value is None.</param> |
| /// <returns>The read value.</returns> |
| protected abstract Task<T> ReadValueAsync(Stream stream, GraphBinaryReader reader, |
| CancellationToken cancellationToken = default); |
| } |
| } |