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AnchorAssigner.cs
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AnchorAssigner.cs
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// This file is part of YamlDotNet - A .NET library for YAML.
// Copyright (c) 2013 Antoine Aubry
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
using System;
using System.Collections.Generic;
using System.Globalization;
namespace YamlDotNet.Serialization.ObjectGraphVisitors
{
public sealed class AnchorAssigner : IObjectGraphVisitor, IAliasProvider
{
private class AnchorAssignment
{
public string Anchor;
}
private readonly IDictionary<object, AnchorAssignment> assignments = new Dictionary<object, AnchorAssignment>();
private uint nextId;
bool IObjectGraphVisitor.Enter(IObjectDescriptor value)
{
// Do not assign anchors to basic types
if (value.Value == null || Type.GetTypeCode(value.Type) != TypeCode.Object)
{
return false;
}
AnchorAssignment assignment;
if (assignments.TryGetValue(value.Value, out assignment))
{
if (assignment.Anchor == null)
{
assignment.Anchor = "o" + nextId.ToString(CultureInfo.InvariantCulture);
++nextId;
}
return false;
}
else
{
assignments.Add(value.Value, new AnchorAssignment());
return true;
}
}
bool IObjectGraphVisitor.EnterMapping(IObjectDescriptor key, IObjectDescriptor value)
{
return true;
}
bool IObjectGraphVisitor.EnterMapping(IPropertyDescriptor key, IObjectDescriptor value)
{
return true;
}
void IObjectGraphVisitor.VisitScalar(IObjectDescriptor scalar) { }
void IObjectGraphVisitor.VisitMappingStart(IObjectDescriptor mapping, Type keyType, Type valueType) { }
void IObjectGraphVisitor.VisitMappingEnd(IObjectDescriptor mapping) { }
void IObjectGraphVisitor.VisitSequenceStart(IObjectDescriptor sequence, Type elementType) { }
void IObjectGraphVisitor.VisitSequenceEnd(IObjectDescriptor sequence) { }
string IAliasProvider.GetAlias(object target)
{
AnchorAssignment assignment;
if (target != null && assignments.TryGetValue(target, out assignment))
{
return assignment.Anchor;
}
return null;
}
}
}