#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.Collections;
using System.Runtime.Serialization;
namespace Spring.Expressions{
/// <summary>
/// Represents parsed variable node.
/// </summary>
/// <author>Aleksandar Seovic</author>
[Serializable]
public class LocalVariableNode : BaseNode
{
//internal const string LOCAL_VARIABLES = "__locals";
/// <summary>
/// Create a new instance
/// </summary>
public LocalVariableNode()
{
}
/// <summary>
/// Create a new instance from SerializationInfo
/// </summary>
protected LocalVariableNode(SerializationInfo info, StreamingContext context)
: base(info, context)
{
}
/// <summary>
/// Returns value of the local variable represented by this 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)
{
string varName = this.getText();
IDictionary locals = evalContext.LocalVariables;
if (locals != null)
{
return locals[varName];
}
return null;
}
/// <summary>
/// Sets value of the local variable represented by this node.
/// </summary>
/// <param name="context">Context to evaluate expressions against.</param>
/// <param name="evalContext">Current expression evaluation context.</param>
/// <param name="newValue">New value for this node.</param>
protected override void Set(object context, EvaluationContext evalContext, object newValue)
{
string varName = this.getText();
IDictionary locals = evalContext.LocalVariables;
if (locals == null)
{
locals = new Hashtable();
evalContext.LocalVariables = locals;
}
locals[varName] = newValue;
}
}
}
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