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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Linq;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Newtonsoft.Json.Serialization;
namespace Microsoft.AspNetCore.JsonPatch.Internal;
/// <summary>
/// This API supports infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public class PocoAdapter : IAdapter
{
public virtual bool TryAdd(
object target,
string segment,
IContractResolver contractResolver,
object value,
out string errorMessage)
{
if (!TryGetJsonProperty(target, contractResolver, segment, out var jsonProperty))
{
errorMessage = Resources.FormatTargetLocationAtPathSegmentNotFound(segment);
return false;
}
if (!jsonProperty.Writable)
{
errorMessage = Resources.FormatCannotUpdateProperty(segment);
return false;
}
if (!TryConvertValue(value, jsonProperty.PropertyType, contractResolver, out var convertedValue))
{
errorMessage = Resources.FormatInvalidValueForProperty(value);
return false;
}
jsonProperty.ValueProvider.SetValue(target, convertedValue);
errorMessage = null;
return true;
}
public virtual bool TryGet(
object target,
string segment,
IContractResolver contractResolver,
out object value,
out string errorMessage)
{
if (!TryGetJsonProperty(target, contractResolver, segment, out var jsonProperty))
{
errorMessage = Resources.FormatTargetLocationAtPathSegmentNotFound(segment);
value = null;
return false;
}
if (!jsonProperty.Readable)
{
errorMessage = Resources.FormatCannotReadProperty(segment);
value = null;
return false;
}
value = jsonProperty.ValueProvider.GetValue(target);
errorMessage = null;
return true;
}
public virtual bool TryRemove(
object target,
string segment,
IContractResolver contractResolver,
out string errorMessage)
{
if (!TryGetJsonProperty(target, contractResolver, segment, out var jsonProperty))
{
errorMessage = Resources.FormatTargetLocationAtPathSegmentNotFound(segment);
return false;
}
if (!jsonProperty.Writable)
{
errorMessage = Resources.FormatCannotUpdateProperty(segment);
return false;
}
// Setting the value to "null" will use the default value in case of value types, and
// null in case of reference types
object value = null;
if (jsonProperty.PropertyType.IsValueType
&& Nullable.GetUnderlyingType(jsonProperty.PropertyType) == null)
{
value = Activator.CreateInstance(jsonProperty.PropertyType);
}
jsonProperty.ValueProvider.SetValue(target, value);
errorMessage = null;
return true;
}
public virtual bool TryReplace(
object target,
string segment,
IContractResolver
contractResolver,
object value,
out string errorMessage)
{
if (!TryGetJsonProperty(target, contractResolver, segment, out var jsonProperty))
{
errorMessage = Resources.FormatTargetLocationAtPathSegmentNotFound(segment);
return false;
}
if (!jsonProperty.Writable)
{
errorMessage = Resources.FormatCannotUpdateProperty(segment);
return false;
}
if (!TryConvertValue(value, jsonProperty.PropertyType, contractResolver, out var convertedValue))
{
errorMessage = Resources.FormatInvalidValueForProperty(value);
return false;
}
jsonProperty.ValueProvider.SetValue(target, convertedValue);
errorMessage = null;
return true;
}
public virtual bool TryTest(
object target,
string segment,
IContractResolver
contractResolver,
object value,
out string errorMessage)
{
if (!TryGetJsonProperty(target, contractResolver, segment, out var jsonProperty))
{
errorMessage = Resources.FormatTargetLocationAtPathSegmentNotFound(segment);
return false;
}
if (!jsonProperty.Readable)
{
errorMessage = Resources.FormatCannotReadProperty(segment);
return false;
}
if (!TryConvertValue(value, jsonProperty.PropertyType, contractResolver, out var convertedValue))
{
errorMessage = Resources.FormatInvalidValueForProperty(value);
return false;
}
var currentValue = jsonProperty.ValueProvider.GetValue(target);
if (!JToken.DeepEquals(JsonConvert.SerializeObject(currentValue), JsonConvert.SerializeObject(convertedValue)))
{
errorMessage = Resources.FormatValueNotEqualToTestValue(currentValue, value, segment);
return false;
}
errorMessage = null;
return true;
}
public virtual bool TryTraverse(
object target,
string segment,
IContractResolver contractResolver,
out object value,
out string errorMessage)
{
if (target == null)
{
value = null;
errorMessage = null;
return false;
}
if (TryGetJsonProperty(target, contractResolver, segment, out var jsonProperty))
{
value = jsonProperty.ValueProvider.GetValue(target);
errorMessage = null;
return true;
}
value = null;
errorMessage = Resources.FormatTargetLocationAtPathSegmentNotFound(segment);
return false;
}
protected virtual bool TryGetJsonProperty(
object target,
IContractResolver contractResolver,
string segment,
out JsonProperty jsonProperty)
{
if (contractResolver.ResolveContract(target.GetType()) is JsonObjectContract jsonObjectContract)
{
var pocoProperty = jsonObjectContract
.Properties
.FirstOrDefault(p => string.Equals(p.PropertyName, segment, StringComparison.OrdinalIgnoreCase));
if (pocoProperty != null)
{
jsonProperty = pocoProperty;
return true;
}
}
jsonProperty = null;
return false;
}
protected virtual bool TryConvertValue(object value, Type propertyType, out object convertedValue)
{
return TryConvertValue(value, propertyType, null, out convertedValue);
}
protected virtual bool TryConvertValue(object value, Type propertyType, IContractResolver contractResolver, out object convertedValue)
{
var conversionResult = ConversionResultProvider.ConvertTo(value, propertyType, contractResolver);
if (!conversionResult.CanBeConverted)
{
convertedValue = null;
return false;
}
convertedValue = conversionResult.ConvertedInstance;
return true;
}
}
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