#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.Expressions;
using Spring.Objects.Factory;
namespace Spring.Context.Support{
/// <summary>
/// Represents a reference to a Spring-managed object.
/// </summary>
/// <author>Aleksandar Seovic</author>
[Serializable]
public class ReferenceNode : BaseNode
{
/// <summary>
/// Create a new instance
/// </summary>
public ReferenceNode():base()
{
}
/// <summary>
/// Create a new instance from SerializationInfo
/// </summary>
protected ReferenceNode(SerializationInfo info, StreamingContext context)
: base(info, context)
{
}
/// <summary>
/// Returns a value for the integer literal 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)
{
IApplicationContext ctx;
string objectName;
if (this.getNumberOfChildren() == 2)
{
string contextName = this.getFirstChild().getText();
objectName = this.getFirstChild().getNextSibling().getText();
ctx = ContextRegistry.GetContext(contextName);
if (ctx == null)
{
throw new ArgumentException(string.Format("Context '{0}' is not registered.", contextName));
}
}
else
{
objectName = this.getFirstChild().getText();
IObjectFactory currentObjectFactory = (evalContext.Variables != null)
? (IObjectFactory)evalContext.Variables[Expression.ReservedVariableNames.CurrentObjectFactory]
: null;
// this is a local reference within an object factory
if (currentObjectFactory != null)
{
return currentObjectFactory.GetObject(objectName);
}
// else lookup in default context
ctx = ContextRegistry.GetContext();
if (ctx == null)
{
throw new ArgumentException("No context registered.");
}
}
return ctx.GetObject(objectName);
}
}
}
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