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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
using NUnit.Framework;
using NUnit.Framework.SyntaxHelpers;
using OpenMetaverse;
using OpenSim.Framework;
namespace OpenSim.Data.Tests
{
//This is generic so that the lambda expressions will work right in IDEs.
public class PropertyScrambler<T>
{
readonly System.Collections.Generic.List<string> membersToNotScramble = new List<string>();
private void AddExpressionToNotScrableList(Expression expression)
{
UnaryExpression unaryExpression = expression as UnaryExpression;
if(unaryExpression != null)
{
AddExpressionToNotScrableList(unaryExpression.Operand);
return;
}
MemberExpression memberExpression = expression as MemberExpression;
if (memberExpression != null)
{
if (!(memberExpression.Member is PropertyInfo))
{
throw new NotImplementedException("I don't know how deal with a MemberExpression that is a " + expression.Type);
}
membersToNotScramble.Add(memberExpression.Member.Name);
return;
}
throw new NotImplementedException("I don't know how to parse a " + expression.Type);
}
public PropertyScrambler<T> DontScramble(Expression<Func<T, object>> expression)
{
AddExpressionToNotScrableList(expression.Body);
return this;
}
public void Scramble(T obj)
{
internalScramble(obj);
}
private void internalScramble(object obj)
{
PropertyInfo[] properties = obj.GetType().GetProperties();
foreach (var property in properties)
{
//Skip indexers of classes. We will assume that everything that has an indexer
// is also IEnumberable. May not always be true, but should be true normally.
if(property.GetIndexParameters().Length > 0)
continue;
RandomizeProperty(obj, property, null);
}
//Now if it implments IEnumberable, it's probably some kind of list, so we should randomize
// everything inside of it.
IEnumerable enumerable = obj as IEnumerable;
if(enumerable != null)
{
foreach (object value in enumerable)
{
internalScramble(value);
}
}
}
private readonly Random random = new Random();
private void RandomizeProperty(object obj, PropertyInfo property, object[] index)
{//I'd like a better way to compare, but I had lots of problems with InventoryFolderBase because the ID is inherited.
if(membersToNotScramble.Contains(property.Name))
return;
Type t = property.PropertyType;
if (!property.CanWrite)
return;
object value = property.GetValue(obj, index);
if (value == null)
return;
if (t == typeof(string))
property.SetValue(obj, RandomName(), index);
else if (t == typeof(UUID))
property.SetValue(obj, UUID.Random(), index);
else if (t == typeof(sbyte))
property.SetValue(obj, (sbyte)random.Next(sbyte.MinValue, sbyte.MaxValue), index);
else if (t == typeof(short))
property.SetValue(obj, (short)random.Next(short.MinValue, short.MaxValue), index);
else if (t == typeof(int))
property.SetValue(obj, random.Next(), index);
else if (t == typeof(long))
property.SetValue(obj, random.Next() * int.MaxValue, index);
else if (t == typeof(byte))
property.SetValue(obj, (byte)random.Next(byte.MinValue, byte.MaxValue), index);
else if (t == typeof(ushort))
property.SetValue(obj, (ushort)random.Next(ushort.MinValue, ushort.MaxValue), index);
else if (t == typeof(uint))
property.SetValue(obj, Convert.ToUInt32(random.Next()), index);
else if (t == typeof(ulong))
property.SetValue(obj, Convert.ToUInt64(random.Next()) * Convert.ToUInt64(UInt32.MaxValue), index);
else if (t == typeof(bool))
property.SetValue(obj, true, index);
else if (t == typeof(byte[]))
{
byte[] bytes = new byte[30];
random.NextBytes(bytes);
property.SetValue(obj, bytes, index);
}
else
internalScramble(value);
}
private string RandomName()
{
StringBuilder name = new StringBuilder();
int size = random.Next(5, 12);
for (int i = 0; i < size; i++)
{
char ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));
name.Append(ch);
}
return name.ToString();
}
}
[TestFixture]
public class PropertyScramblerTests
{
[Test]
public void TestScramble()
{
AssetBase actual = new AssetBase(UUID.Random(), "asset one");
new PropertyScrambler<AssetBase>().Scramble(actual);
}
[Test]
public void DontScramble()
{
UUID uuid = UUID.Random();
AssetBase asset = new AssetBase();
asset.FullID = uuid;
new PropertyScrambler<AssetBase>()
.DontScramble(x => x.Metadata)
.DontScramble(x => x.FullID)
.DontScramble(x => x.ID)
.Scramble(asset);
Assert.That(asset.FullID, Is.EqualTo(uuid));
}
}
}
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