#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 Spring.Util;
#endregion
namespace Spring.Objects.Factory.Config{
/// <summary>
/// <see cref="Spring.Objects.Factory.IFactoryObject"/> implementation that
/// creates delegates.
/// </summary>
/// <remarks>
/// <p>
/// Supports the creation of <see cref="System.Delegate"/>s for both
/// instance and <see langword="static"/> methods.
/// </p>
/// </remarks>
/// <author>Rick Evans</author>
[Serializable]
public class DelegateFactoryObject : AbstractFactoryObject
{
/// <summary>
/// Callback method called once all factory properties have been set.
/// </summary>
/// <exception cref="System.Exception">
/// In the event of misconfiguration (such as failure to set an essential
/// property) or if initialization fails.
/// </exception>
/// <seealso cref="Spring.Objects.Factory.IInitializingObject.AfterPropertiesSet"/>
public override void AfterPropertiesSet()
{
if (DelegateType == null)
{
throw new ArgumentException(
"The 'DelegateType' property is required.");
}
if (!typeof (Delegate).IsAssignableFrom(DelegateType))
{
throw new ArgumentException(
"The 'DelegateType' property must (obviously) be a Type derived from [System.Delegate].");
}
if (TargetType == null && TargetObject == null)
{
throw new ArgumentException(
"Exactly one of either the 'TargetType' or 'TargetObject' properties is required.");
}
if (TargetType != null && TargetObject != null)
{
throw new ArgumentException(
"Exactly one of either the 'TargetType' or 'TargetObject' properties is required (not both).");
}
if (StringUtils.IsNullOrEmpty(MethodName))
{
throw new ArgumentException(
"The 'MethodName' property is required.");
}
base.AfterPropertiesSet();
}
/// <summary>
/// Creates the delegate.
/// </summary>
/// <exception cref="System.Exception">
/// If an exception occured during object creation.
/// </exception>
/// <returns>The object returned by this factory.</returns>
/// <seealso cref="Spring.Objects.Factory.Config.AbstractFactoryObject.CreateInstance()"/>
protected override object CreateInstance()
{
Delegate instance = null;
if (TargetType != null)
{
instance = Delegate.CreateDelegate(DelegateType, TargetType, MethodName);
}
else
{
instance = Delegate.CreateDelegate(DelegateType, TargetObject, MethodName);
}
return instance;
}
#region Properties
/// <summary>
/// The <see cref="System.Type"/> of <see cref="System.Delegate"/>
/// created by this factory.
/// </summary>
/// <remarks>
/// <p>
/// Returns the <see cref="System.Delegate"/> <see cref="System.Type"/>
/// if accessed prior to the <see cref="AfterPropertiesSet"/> method
/// being called.
/// </p>
/// </remarks>
public override Type ObjectType
{
get
{
return (DelegateType != null)
? DelegateType
: typeof (Delegate);
}
}
/// <summary>
/// The <see cref="System.Type"/> of the <see cref="System.Delegate"/>
/// created by this factory.
/// </summary>
public Type DelegateType
{
get { return _delegateType; }
set { _delegateType = value; }
}
/// <summary>
/// The name of the method that is to be invoked by the created
/// delegate.
/// </summary>
public string MethodName
{
get { return _methodName; }
set { _methodName = value; }
}
/// <summary>
/// The target <see cref="System.Type"/> if the <see cref="MethodName"/>
/// refers to a <see langword="static"/> method.
/// </summary>
public Type TargetType
{
get { return _targetType; }
set { _targetType = value; }
}
/// <summary>
/// The target object if the <see cref="MethodName"/>
/// refers to an instance method.
/// </summary>
public object TargetObject
{
get { return _targetObject; }
set { _targetObject = value; }
}
#endregion
#region Fields
private Type _delegateType;
private string _methodName;
private Type _targetType;
private object _targetObject;
#endregion
}
}
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