| #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; |
| using System.Collections.Generic; |
| using System.Linq; |
| using System.Text.Json; |
| |
| namespace Gremlin.Net.Structure.IO.GraphSON |
| { |
| /// <summary> |
| /// Allows to deserialize GraphSON to objects. |
| /// </summary> |
| public abstract class GraphSONReader |
| { |
| /// <summary> |
| /// Contains the <see cref="IGraphSONDeserializer" /> instances by their type identifier. |
| /// </summary> |
| protected readonly Dictionary<string, IGraphSONDeserializer> Deserializers = new Dictionary |
| <string, IGraphSONDeserializer> |
| { |
| {"g:Traverser", new TraverserReader()}, |
| {"g:Int32", new Int32Converter()}, |
| {"g:Int64", new Int64Converter()}, |
| {"g:Float", new FloatConverter()}, |
| {"g:Double", new DoubleConverter()}, |
| {"g:Direction", new DirectionDeserializer()}, |
| {"g:UUID", new UuidDeserializer()}, |
| {"g:Date", new DateDeserializer()}, |
| {"g:Timestamp", new DateDeserializer()}, |
| {"g:Vertex", new VertexDeserializer()}, |
| {"g:Edge", new EdgeDeserializer()}, |
| {"g:Property", new PropertyDeserializer()}, |
| {"g:VertexProperty", new VertexPropertyDeserializer()}, |
| {"g:Path", new PathDeserializer()}, |
| {"g:T", new TDeserializer()}, |
| |
| //Extended |
| {"gx:BigDecimal", new DecimalConverter()}, |
| {"gx:Duration", new DurationDeserializer()}, |
| {"gx:BigInteger", new BigIntegerDeserializer()}, |
| {"gx:Byte", new ByteConverter()}, |
| {"gx:ByteBuffer", new ByteBufferDeserializer()}, |
| {"gx:Char", new CharConverter()}, |
| {"gx:Int16", new Int16Converter() } |
| }; |
| |
| /// <summary> |
| /// Initializes a new instance of the <see cref="GraphSONReader" /> class. |
| /// </summary> |
| protected GraphSONReader() |
| { |
| } |
| |
| /// <summary> |
| /// Initializes a new instance of the <see cref="GraphSONReader" /> class. |
| /// </summary> |
| /// <param name="deserializerByGraphSONType"> |
| /// <see cref="IGraphSONDeserializer" /> deserializers identified by their |
| /// GraphSON type. |
| /// </param> |
| protected GraphSONReader(IReadOnlyDictionary<string, IGraphSONDeserializer> deserializerByGraphSONType) |
| { |
| foreach (var deserializerAndGraphSONType in deserializerByGraphSONType) |
| Deserializers[deserializerAndGraphSONType.Key] = deserializerAndGraphSONType.Value; |
| } |
| |
| /// <summary> |
| /// Deserializes a GraphSON collection to an object. |
| /// </summary> |
| /// <param name="graphSonData">The GraphSON collection to deserialize.</param> |
| /// <returns>The deserialized object.</returns> |
| public virtual dynamic ToObject(IEnumerable<JsonElement> graphSonData) |
| { |
| return graphSonData.Select(graphson => ToObject(graphson)); |
| } |
| |
| /// <summary> |
| /// Deserializes GraphSON to an object. |
| /// </summary> |
| /// <param name="graphSon">The GraphSON to deserialize.</param> |
| /// <returns>The deserialized object.</returns> |
| public virtual dynamic ToObject(JsonElement graphSon) |
| { |
| switch (graphSon.ValueKind) |
| { |
| case JsonValueKind.Array: |
| return graphSon.EnumerateArray().Select(t => ToObject(t)); |
| case JsonValueKind.String: |
| return graphSon.GetString(); |
| case JsonValueKind.Null: |
| return null; |
| case JsonValueKind.True: |
| return true; |
| case JsonValueKind.False: |
| return false; |
| case JsonValueKind.Object: |
| break; |
| default: |
| throw new ArgumentOutOfRangeException(nameof(graphSon.ValueKind), graphSon.ValueKind, |
| $"JSON type not supported."); |
| } |
| |
| if (graphSon.TryGetProperty(GraphSONTokens.TypeKey, out var graphSonTypeProperty)) |
| { |
| return ReadValueOfType(graphSon, graphSonTypeProperty.GetString()); |
| } |
| return ReadDictionary(graphSon); |
| |
| } |
| |
| private dynamic ReadValueOfType(JsonElement typedValue, string graphSONType) |
| { |
| if (!Deserializers.TryGetValue(graphSONType, out var deserializer)) |
| { |
| throw new InvalidOperationException($"Deserializer for \"{graphSONType}\" not found"); |
| } |
| return deserializer.Objectify(typedValue.GetProperty(GraphSONTokens.ValueKey), this); |
| } |
| |
| private dynamic ReadDictionary(JsonElement jsonDict) |
| { |
| return jsonDict.EnumerateObject() |
| .ToDictionary(property => property.Name, property => ToObject(property.Value)); |
| } |
| } |
| } |