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Merge pull request #1 from SixLabors/feature/add-guards
Added guards from the ImageSharp project
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‎src/SixLabors.Core/Helpers/DebugGuard.cs‎

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// Copyright (c) Six Labors and contributors.
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// Licensed under the Apache License, Version 2.0.
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using System;
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using System.Diagnostics;
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namespace SixLabors
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{
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/// <summary>
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/// Provides methods to protect against invalid parameters for a DEBUG build.
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/// </summary>
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[DebuggerStepThrough]
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internal static class DebugGuard
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{
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/// <summary>
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/// Verifies, that the method parameter with specified object value is not null
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/// and throws an exception if it is found to be so.
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/// </summary>
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/// <param name="target">The target object, which cannot be null.</param>
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/// <param name="parameterName">The name of the parameter that is to be checked.</param>
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/// <exception cref="ArgumentNullException"><paramref name="target"/> is null</exception>
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[Conditional("DEBUG")]
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public static void NotNull(object target, string parameterName)
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{
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if (target == null)
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{
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throw new ArgumentNullException(parameterName);
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}
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}
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/// <summary>
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/// Verifies that the specified value is less than a maximum value
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/// and throws an exception if it is not.
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/// </summary>
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/// <param name="value">The target value, which should be validated.</param>
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/// <param name="max">The maximum value.</param>
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/// <param name="parameterName">The name of the parameter that is to be checked.</param>
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/// <typeparam name="TValue">The type of the value.</typeparam>
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/// <exception cref="ArgumentException">
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/// <paramref name="value"/> is greater than the maximum value.
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/// </exception>
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[Conditional("DEBUG")]
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public static void MustBeLessThan<TValue>(TValue value, TValue max, string parameterName)
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where TValue : IComparable<TValue>
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{
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if (value.CompareTo(max) >= 0)
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{
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throw new ArgumentOutOfRangeException(parameterName, $"Value must be less than {max}.");
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}
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}
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/// <summary>
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/// Verifies that the specified value is less than or equal to a maximum value
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/// and throws an exception if it is not.
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/// </summary>
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/// <param name="value">The target value, which should be validated.</param>
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/// <param name="max">The maximum value.</param>
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/// <param name="parameterName">The name of the parameter that is to be checked.</param>
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/// <typeparam name="TValue">The type of the value.</typeparam>
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/// <exception cref="ArgumentException">
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/// <paramref name="value"/> is greater than the maximum value.
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/// </exception>
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[Conditional("DEBUG")]
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public static void MustBeLessThanOrEqualTo<TValue>(TValue value, TValue max, string parameterName)
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where TValue : IComparable<TValue>
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{
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if (value.CompareTo(max) > 0)
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{
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throw new ArgumentOutOfRangeException(parameterName, $"Value must be less than or equal to {max}.");
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}
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}
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/// <summary>
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/// Verifies that the specified value is greater than a minimum value
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/// and throws an exception if it is not.
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/// </summary>
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/// <param name="value">The target value, which should be validated.</param>
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/// <param name="min">The minimum value.</param>
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/// <param name="parameterName">The name of the parameter that is to be checked.</param>
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/// <typeparam name="TValue">The type of the value.</typeparam>
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/// <exception cref="ArgumentException">
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/// <paramref name="value"/> is less than the minimum value.
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/// </exception>
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[Conditional("DEBUG")]
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public static void MustBeGreaterThan<TValue>(TValue value, TValue min, string parameterName)
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where TValue : IComparable<TValue>
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{
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if (value.CompareTo(min) <= 0)
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{
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throw new ArgumentOutOfRangeException(
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parameterName,
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$"Value must be greater than {min}.");
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}
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}
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/// <summary>
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/// Verifies that the specified value is greater than or equal to a minimum value
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/// and throws an exception if it is not.
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/// </summary>
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/// <param name="value">The target value, which should be validated.</param>
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/// <param name="min">The minimum value.</param>
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/// <param name="parameterName">The name of the parameter that is to be checked.</param>
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/// <typeparam name="TValue">The type of the value.</typeparam>
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/// <exception cref="ArgumentException">
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/// <paramref name="value"/> is less than the minimum value.
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/// </exception>
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[Conditional("DEBUG")]
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public static void MustBeGreaterThanOrEqualTo<TValue>(TValue value, TValue min, string parameterName)
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where TValue : IComparable<TValue>
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{
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if (value.CompareTo(min) < 0)
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{
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throw new ArgumentOutOfRangeException(parameterName, $"Value must be greater than or equal to {min}.");
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}
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}
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/// <summary>
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/// Verifies, that the method parameter with specified target value is true
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/// and throws an exception if it is found to be so.
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/// </summary>
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/// <param name="target">
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/// The target value, which cannot be false.
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/// </param>
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/// <param name="parameterName">
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/// The name of the parameter that is to be checked.
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/// </param>
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/// <param name="message">
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/// The error message, if any to add to the exception.
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/// </param>
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/// <exception cref="ArgumentException">
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/// <paramref name="target"/> is false
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/// </exception>
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[Conditional("DEBUG")]
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public static void IsTrue(bool target, string parameterName, string message)
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{
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if (!target)
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{
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throw new ArgumentException(message, parameterName);
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}
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}
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/// <summary>
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/// Verifies, that the method parameter with specified target value is false
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/// and throws an exception if it is found to be so.
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/// </summary>
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/// <param name="target">The target value, which cannot be true.</param>
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/// <param name="parameterName">The name of the parameter that is to be checked.</param>
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/// <param name="message">The error message, if any to add to the exception.</param>
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/// <exception cref="ArgumentException">
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/// <paramref name="target"/> is true
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/// </exception>
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[Conditional("DEBUG")]
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public static void IsFalse(bool target, string parameterName, string message)
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{
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if (target)
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{
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throw new ArgumentException(message, parameterName);
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}
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}
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/// <summary>
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/// Verifies, that the target span is of same size than the 'other' span.
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/// </summary>
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/// <typeparam name="T">The element type of the spans</typeparam>
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/// <param name="target">The target span.</param>
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/// <param name="other">The 'other' span to compare 'target' to.</param>
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/// <param name="parameterName">The name of the parameter that is to be checked.</param>
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/// <exception cref="ArgumentException">
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/// <paramref name="target"/> is true
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/// </exception>
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[Conditional("DEBUG")]
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public static void MustBeSameSized<T>(ReadOnlySpan<T> target, ReadOnlySpan<T> other, string parameterName)
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where T : struct
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{
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if (target.Length != other.Length)
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{
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throw new ArgumentException("Span-s must be the same size!", parameterName);
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}
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}
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/// <summary>
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/// Verifies, that the `target` span has the length of 'minSpan', or longer.
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/// </summary>
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/// <typeparam name="T">The element type of the spans</typeparam>
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/// <param name="target">The target span.</param>
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/// <param name="minSpan">The 'minSpan' span to compare 'target' to.</param>
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/// <param name="parameterName">The name of the parameter that is to be checked.</param>
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/// <exception cref="ArgumentException">
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/// <paramref name="target"/> is true
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/// </exception>
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[Conditional("DEBUG")]
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public static void MustBeSizedAtLeast<T>(ReadOnlySpan<T> target, ReadOnlySpan<T> minSpan, string parameterName)
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where T : struct
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{
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if (target.Length < minSpan.Length)
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{
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throw new ArgumentException($"Span-s must be at least of length {minSpan.Length}!", parameterName);
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}
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}
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}
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}

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