Determine whether a given collection only contains a single unique object : ICollection « Collections Data Structure « C# / C Sharp

1. C# / C Sharp
2. Collections Data Structure
3. ICollection

Determine whether a given collection only contains a single unique object

  
        
#region License

/*
 * Copyright  2002-2005 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#endregion

#region Imports

using System;
using System.Collections;
using System.Reflection;

#endregion

namespace Spring.Util
{
    /// <summary>
    /// Miscellaneous collection utility methods.
    /// </summary>
    /// <remarks>
    /// Mainly for internal use within the framework.
    /// </remarks>
    /// <author>Mark Pollack (.NET)</author>
    public sealed class CollectionUtils
    {
        /// <summary>
        /// Determine whether a given collection only contains
        /// a single unique object
        /// </summary>
        /// <param name="coll"></param>
        /// <returns></returns>
        public static bool HasUniqueObject(ICollection coll)
        {
            if (coll.Count == 0)
            {
                return false;
            }
            object candidate = null;
            foreach (object elem in coll)
            {
                if (candidate == null)
                {
                    candidate = elem;
                }
                else if (candidate != elem)
                {
                    return false;
                }
            }
            return true;
        }
   }
}

   
    
  

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