81 lines
2.8 KiB
C#
81 lines
2.8 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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namespace YamlDotNet.Core
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{
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/// <summary>
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/// Keeps track of the <see cref="current"/> recursion level,
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/// and throws <see cref="MaximumRecursionLevelReachedException"/>
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/// whenever <see cref="Maximum"/> is reached.
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/// </summary>
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internal sealed class RecursionLevel
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{
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private int current;
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public int Maximum { get; }
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public RecursionLevel(int maximum)
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{
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Maximum = maximum;
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}
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/// <summary>
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/// Increments the <see cref="current"/> recursion level,
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/// and throws <see cref="MaximumRecursionLevelReachedException"/>
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/// if <see cref="Maximum"/> is reached.
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/// </summary>
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public void Increment()
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{
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if (!TryIncrement())
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{
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throw new MaximumRecursionLevelReachedException("Maximum level of recursion reached");
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}
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}
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/// <summary>
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/// Increments the <see cref="current"/> recursion level,
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/// and returns whether <see cref="current"/> is still less than <see cref="Maximum"/>.
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/// </summary>
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public bool TryIncrement()
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{
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if (current < Maximum)
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{
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++current;
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return true;
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}
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return false;
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}
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/// <summary>
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/// Decrements the <see cref="current"/> recursion level.
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/// </summary>
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public void Decrement()
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{
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if (current == 0)
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{
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throw new InvalidOperationException("Attempted to decrement RecursionLevel to a negative value");
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}
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--current;
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}
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}
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}
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