#region Namespace Imports

using System;

using System.Collections;

using SharpMap.Expressions;

#endregion

namespace SharpMap.Data.Caching

{

public class NullQueryCache : IQueryCache

{

#region IQueryCache Members

public void AddExpressionResult(Expression expression, Object result) { }

public void AddExpressionResults(Expression expression, IEnumerable result) { }

public Boolean Contains(Expression expression)

{

return false;

}

public Boolean Contains(IEnumerable items)

{

return false;

}

public Boolean Contains(Object item)

{

return false;

}

public IEnumerable Retrieve(Expression expression) { yield break; }

public void Expire(Expression expression) { }

public void Expire(Object item) { }

public void Expire(IEnumerable items) { }

public QueryExpression FilterQuery(QueryExpression query)

{

return query;

}

#endregion

#region IEnumerable Members

public IEnumerator GetEnumerator()

{

yield break;

}

#endregion

}

}