Mega Code Archive
Deep Comparison two objects if they are alike
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#region License and Copyright
/*
* Dotnet Commons Reflection
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place,
* Suite 330,
* Boston,
* MA 02111-1307
* USA
*
*/
#endregion
using System;
using System.Collections;
using System.IO;
using System.Reflection;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
namespace Dotnet.Commons.Reflection
{
/// -----------------------------------------------------------------------
/// <summary>
/// This utility class contains a rich sets of utility methods that perform operations
/// on objects during runtime such as copying of property and field values
/// between 2 objects, deep cloning of objects, etc.
/// </summary>
/// -----------------------------------------------------------------------
public abstract class ObjectUtils
{
/// ------------------------------------------------------------------------
/// <summary>
/// Deep Comparison two objects if they are alike. The objects are consider alike if
/// they are:
/// <list type="ordered">
/// <item>of the same <see cref="System.Type"/>,</item>
/// <item>have the same number of methods, properties and fields</item>
/// <item>the public and private properties and fields values reflect each other's. </item>
/// </list>
/// </summary>
/// <param name="original"></param>
/// <param name="comparedToObject"></param>
/// <returns></returns>
/// ------------------------------------------------------------------------
public static bool IsALike(object original, object comparedToObject)
{
if (original.GetType() != comparedToObject.GetType())
return false;
// ...............................................
// Compare Number of Private and public Methods
// ...............................................
MethodInfo[] originalMethods = original
.GetType()
.GetMethods(BindingFlags.Instance |
BindingFlags.NonPublic |
BindingFlags.Public);
MethodInfo[] comparedMethods = comparedToObject
.GetType()
.GetMethods(BindingFlags.Instance |
BindingFlags.NonPublic |
BindingFlags.Public);
if (comparedMethods.Length != originalMethods.Length)
return false;
// ...............................................
// Compare Number of Private and public Properties
// ................................................
PropertyInfo[] originalProperties = original
.GetType()
.GetProperties(BindingFlags.Instance |
BindingFlags.NonPublic |
BindingFlags.Public);
PropertyInfo[] comparedProperties = comparedToObject
.GetType()
.GetProperties(BindingFlags.Instance |
BindingFlags.NonPublic |
BindingFlags.Public);
if (comparedProperties.Length != originalProperties.Length)
return false;
// ...........................................
// Compare number of public and private fields
// ...........................................
FieldInfo[] originalFields = original
.GetType()
.GetFields(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
FieldInfo[] comparedToFields = comparedToObject
.GetType()
.GetFields(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
if (comparedToFields.Length != originalFields.Length)
return false;
// ........................................
// compare field values
// ........................................
foreach (FieldInfo fi in originalFields)
{
// check to see if the object to contains the field
FieldInfo fiComparedObj = comparedToObject.GetType().GetField(fi.Name, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
if (fiComparedObj == null)
return false;
// Get the value of the field from the original object
Object srcValue = original.GetType().InvokeMember(fi.Name,
BindingFlags.GetField | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public,
null,
original,
null);
// Get the value of the field
object comparedObjFieldValue = comparedToObject
.GetType()
.InvokeMember(fiComparedObj.Name,
BindingFlags.GetField | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public,
null,
comparedToObject,
null);
// -------------------------------
// now compare the field values
// -------------------------------
if (srcValue == null)
{
if (comparedObjFieldValue != null)
return false;
else
return true;
}
if (srcValue.GetType() != comparedObjFieldValue.GetType())
return false;
if (!srcValue.ToString().Equals(comparedObjFieldValue.ToString()))
return false;
}
// ........................................
// compare each Property values
// ........................................
foreach (PropertyInfo pi in originalProperties)
{
// check to see if the object to contains the field
PropertyInfo piComparedObj = comparedToObject
.GetType()
.GetProperty(pi.Name, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
if (piComparedObj == null)
return false;
// Get the value of the property from the original object
Object srcValue = original
.GetType()
.InvokeMember(pi.Name,
BindingFlags.GetProperty | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public,
null,
original,
null);
// Get the value of the property
object comparedObjValue = comparedToObject
.GetType()
.InvokeMember(piComparedObj.Name,
BindingFlags.GetProperty | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public,
null,
comparedToObject,
null);
// -------------------------------
// now compare the property values
// -------------------------------
if (srcValue.GetType() != comparedObjValue.GetType())
return false;
if (!srcValue.ToString().Equals(comparedObjValue.ToString()))
return false;
}
return true;
}
}
}
]]>