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// ***********************************************************************
// Copyright (c) 2009 Charlie Poole
//
// 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;
namespace NUnit.Framework.Internal
{
/// <summary>
/// RandomGenerator returns a set of random values in a repeatable
/// way, to allow re-running of tests if necessary.
///
/// This class is internal to the framework but exposed externally to through the TestContext
/// the class is used to allow for obtaining repeatable random values during a tests execution.
/// this class should not be used inside the framework only with a TestMethod.
/// </summary>
public class RandomGenerator
{
#region Members & Constructor
/// <summary>
/// Seed for the wrapped Random
/// </summary>
public readonly int seed;
private Random random;
/// <summary>
/// Lazy-loaded Random built on the readonly Seed
/// </summary>
private Random Rand
{
get
{
random = random == null ? new Random(seed) : random;
return random;
}
}
/// <summary>
/// Constructor requires Seed value in order to store it for use in Random creation
/// </summary>
/// <param name="seed"></param>
public RandomGenerator(int seed)
{
this.seed = seed;
}
#endregion
#region Ints
/// <summary>
/// Get Next Integer from Random
/// </summary>
/// <returns> int </returns>
public int GetInt()
{
return Rand.Next();
}
/// <summary>
/// Get Next Integer within the specified min & max from Random
/// </summary>
/// <param name="min"></param>
/// <param name="max"></param>
/// <returns> int </returns>
public int GetInt(int min, int max)
{
return Rand.Next(min, max);
}
#endregion
#region Shorts
/// <summary>
/// Get Next Short from Random
/// </summary>
/// <returns> short </returns>
public short GetShort()
{
return (short)Rand.Next(short.MinValue, short.MaxValue);
}
/// <summary>
/// Get Next Short within the specified min & max from Random
/// </summary>
/// <param name="min"></param>
/// <param name="max"></param>
/// <returns> short </returns>
public short GetShort(short min, short max)
{
return (short)Rand.Next(min, max);
}
#endregion
#region Bytes
/// <summary>
/// Get Next Byte from Random
/// </summary>
/// <returns> byte </returns>
public byte GetByte()
{
return (byte)Rand.Next(Byte.MinValue, Byte.MaxValue);
}
/// <summary>
/// Get Next Byte within the specified min & max from Random
/// </summary>
/// <param name="min"></param>
/// <param name="max"></param>
/// <returns> byte </returns>
public byte GetByte(byte min, byte max)
{
return (byte)Rand.Next(min, max);
}
#endregion
#region Bools
/// <summary>
/// Get Random Boolean value
/// </summary>
/// <returns> bool </returns>
public bool GetBool()
{
return Rand.Next(0, 2) == 0;
}
/// <summary>
/// Get Random Boolean value based on the probability of that value being true
/// </summary>
/// <param name="probability"></param>
/// <returns> bool </returns>
public bool GetBool(double probability)
{
return Rand.NextDouble() < Math.Abs(probability % 1.0);
}
#endregion
#region Double & Float
/// <summary>
/// Get Next Double from Random
/// </summary>
/// <returns></returns>
public double GetDouble()
{
return Rand.NextDouble();
}
/// <summary>
/// Get Next Float from Random
/// </summary>
/// <returns></returns>
public float GetFloat()
{
return (float)Rand.NextDouble();
}
#endregion
#region Enums
#if CLR_2_0
/// <summary>
/// Return a random enum value representation of the specified Type
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns> T </returns>
public T GetEnum<T>()
{
Array enums = TypeHelper.GetEnumValues(typeof(T));
return (T)enums.GetValue(Rand.Next(0, enums.Length));
}
#else
/// <summary>
/// Return a random enum value from the specified type
/// </summary>
/// <param name="enumType"></param>
/// <returns> object </returns>
public object GetEnum(Type enumType)
{
Array enums = TypeHelper.GetEnumValues(enumType);
return enums.GetValue(Rand.Next(0, enums.Length));
}
#endif
#endregion
}
}
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