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Copy pathRelationshipObjectFormatter.cs
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128 lines (112 loc) · 5.02 KB
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using System;
using System.Threading.Tasks;
using JSONAPI.Documents;
using Newtonsoft.Json;
namespace JSONAPI.Json
{
/// <summary>
/// Default implementation of IRelationshipObjectFormatter
/// </summary>
public class RelationshipObjectFormatter : IRelationshipObjectFormatter
{
private const string LinksKeyName = "links";
private const string SelfLinkKeyName = "self";
private const string RelatedLinkKeyName = "related";
private const string LinkageKeyName = "data";
private const string MetaKeyName = "meta";
private readonly ILinkFormatter _linkFormatter;
private readonly IResourceLinkageFormatter _resourceLinkageFormatter;
private readonly IMetadataFormatter _metadataFormatter;
/// <summary>
/// Creates a new RelationshipObjectFormatter
/// </summary>
public RelationshipObjectFormatter(ILinkFormatter linkFormatter, IResourceLinkageFormatter resourceLinkageFormatter, IMetadataFormatter metadataFormatter)
{
_linkFormatter = linkFormatter;
_resourceLinkageFormatter = resourceLinkageFormatter;
_metadataFormatter = metadataFormatter;
}
public Task Serialize(IRelationshipObject relationshipObject, JsonWriter writer)
{
if (relationshipObject.Metadata == null && relationshipObject.SelfLink == null &&
relationshipObject.RelatedResourceLink == null && relationshipObject.Linkage == null)
throw new JsonSerializationException(
String.Format("At least one of `{0}`, `{1}`, or `{2}` must be present in a relationship object.",
LinksKeyName, LinkageKeyName, MetaKeyName));
writer.WriteStartObject();
SerializeLinks(relationshipObject, writer);
SerializeLinkage(relationshipObject, writer);
SerializeMetadata(relationshipObject, writer);
writer.WriteEndObject();
return Task.FromResult(0);
}
/// <summary>
/// Serializes the relationship object's links.
/// </summary>
protected virtual void SerializeLinks(IRelationshipObject relationshipObject, JsonWriter writer)
{
if (relationshipObject.SelfLink != null || relationshipObject.RelatedResourceLink != null)
{
writer.WritePropertyName(LinksKeyName);
writer.WriteStartObject();
if (relationshipObject.SelfLink != null)
{
writer.WritePropertyName(SelfLinkKeyName);
_linkFormatter.Serialize(relationshipObject.SelfLink, writer);
}
if (relationshipObject.RelatedResourceLink != null)
{
writer.WritePropertyName(RelatedLinkKeyName);
_linkFormatter.Serialize(relationshipObject.RelatedResourceLink, writer);
}
writer.WriteEndObject();
}
}
/// <summary>
/// Serializes the relationship object's linkage.
/// </summary>
protected virtual void SerializeLinkage(IRelationshipObject relationshipObject, JsonWriter writer)
{
if (relationshipObject.Linkage != null)
{
writer.WritePropertyName(LinkageKeyName);
_resourceLinkageFormatter.Serialize(relationshipObject.Linkage, writer);
}
}
/// <summary>
/// Serializes the relationship object's metadata.
/// </summary>
protected virtual void SerializeMetadata(IRelationshipObject relationshipObject, JsonWriter writer)
{
if (relationshipObject.Metadata != null)
{
writer.WritePropertyName(MetaKeyName);
_metadataFormatter.Serialize(relationshipObject.Metadata, writer);
}
}
public async Task<IRelationshipObject> Deserialize(JsonReader reader, string currentPath)
{
if (reader.TokenType != JsonToken.StartObject)
throw new DeserializationException("Invalid relationship object", "Expected an object, but found " + reader.TokenType, currentPath);
IResourceLinkage linkage = null;
IMetadata metadata = null;
while (reader.Read())
{
if (reader.TokenType == JsonToken.EndObject)
break;
var propertyName = (string)reader.Value;
reader.Read();
switch (propertyName)
{
case LinkageKeyName:
linkage = await _resourceLinkageFormatter.Deserialize(reader, currentPath + "/" + LinkageKeyName);
break;
case MetaKeyName:
metadata = await _metadataFormatter.Deserialize(reader, currentPath + "/" + MetaKeyName);
break;
}
}
return new RelationshipObject(linkage, metadata);
}
}
}