#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
using System;
using System.Runtime.Serialization;
using Spring.Util;
namespace Spring.Expressions{
/// <summary>
/// Represents NOT operator (both, bitwise and logical).
/// </summary>
/// <author>Aleksandar Seovic</author>
[Serializable]
public class OpNOT : UnaryOperator
{
/// <summary>
/// Create a new instance
/// </summary>
public OpNOT():base()
{
}
/// <summary>
/// Create a new instance
/// </summary>
public OpNOT(BaseNode operand)
:base(operand)
{
}
/// <summary>
/// Create a new instance from SerializationInfo
/// </summary>
protected OpNOT(SerializationInfo info, StreamingContext context)
: base(info, context)
{
}
/// <summary>
/// Returns a value for the logical NOT operator node.
/// </summary>
/// <param name="context">Context to evaluate expressions against.</param>
/// <param name="evalContext">Current expression evaluation context.</param>
/// <returns>Node's value.</returns>
protected override object Get(object context, EvaluationContext evalContext)
{
object operand = GetValue(Operand, context, evalContext);
if (NumberUtils.IsInteger(operand))
{
return NumberUtils.BitwiseNot(operand);
}
else if (operand is Enum)
{
Type enumType = operand.GetType();
Type integralType = Enum.GetUnderlyingType(enumType);
operand = Convert.ChangeType(operand, integralType);
object result = NumberUtils.BitwiseNot(operand);
return Enum.ToObject(enumType, result);
}
else
return !Convert.ToBoolean(operand);
}
}
}
|