59 lines
2.4 KiB
C#
59 lines
2.4 KiB
C#
// This file is part of YamlDotNet - A .NET library for YAML.
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// Copyright (c) Antoine Aubry and contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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// of the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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using System;
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using System.ComponentModel;
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using YamlDotNet.Core;
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namespace YamlDotNet.Serialization.ObjectGraphVisitors
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{
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public sealed class DefaultExclusiveObjectGraphVisitor : ChainedObjectGraphVisitor
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{
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public DefaultExclusiveObjectGraphVisitor(IObjectGraphVisitor<IEmitter> nextVisitor)
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: base(nextVisitor)
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{
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}
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private static object? GetDefault(Type type)
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{
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return type.IsValueType() ? Activator.CreateInstance(type) : null;
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}
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public override bool EnterMapping(IObjectDescriptor key, IObjectDescriptor value, IEmitter context)
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{
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return !Equals(value.Value, GetDefault(value.Type))
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&& base.EnterMapping(key, value, context);
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}
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public override bool EnterMapping(IPropertyDescriptor key, IObjectDescriptor value, IEmitter context)
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{
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var defaultValueAttribute = key.GetCustomAttribute<DefaultValueAttribute>();
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var defaultValue = defaultValueAttribute != null
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? defaultValueAttribute.Value
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: GetDefault(key.Type);
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return !Equals(value.Value, defaultValue)
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&& base.EnterMapping(key, value, context);
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}
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}
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}
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