#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.Aop.Target{
/// <summary>
/// <see cref="Spring.Aop.ITargetSource"/> implementation that holds a local
/// object.
/// </summary>
/// <remarks>
/// <p>
/// This is the default implementation of the
/// <see cref="Spring.Aop.ITargetSource"/> interface used by the AOP
/// framework. There should be no need to create objects of this class in
/// application code.
/// </p>
/// </remarks>
/// <author>Rod Johnson</author>
/// <author>Aleksandar Seovic (.NET)</author>
[Serializable]
public sealed class SingletonTargetSource : ITargetSource
{
private readonly object target;
private readonly Type targetType;
/// <summary>
/// Creates a new instance of the
/// <see cref="Spring.Aop.Target.SingletonTargetSource"/>
/// for the specified target object.
/// </summary>
/// <param name="target">The target object to expose.</param>
/// <exception cref="System.ArgumentNullException">
/// If the supplied <paramref name="target"/> is
/// <see langword="null"/>.
/// </exception>
public SingletonTargetSource(object target)
:this(target, target != null ? target.GetType() : null)
{}
/// <summary>
/// Creates a new instance of the
/// <see cref="Spring.Aop.Target.SingletonTargetSource"/>
/// for the specified target object.
/// </summary>
/// <param name="target">The target object to expose.</param>
/// <param name="targetType">The type of <paramref name="target"/> to expose.</param>
/// <exception cref="System.ArgumentNullException">
/// If the supplied <paramref name="target"/> is
/// <see langword="null"/>.
/// </exception>
public SingletonTargetSource(object target, Type targetType)
{
AssertUtils.ArgumentNotNull(target, "target");
AssertUtils.ArgumentNotNull(targetType, "targetType");
this.target = target;
this.targetType = targetType;
}
#region ITarget Source impl
/// <summary>
/// The <see cref="System.Type"/> of the target object.
/// </summary>
public Type TargetType
{
get { return targetType; }
}
/// <summary>
/// Is the target source static?
/// </summary>
/// <value>
/// <see langword="true"/> because this target source is always static.
/// </value>
public bool IsStatic
{
get { return true; }
}
/// <summary>
/// Returns the target object.
/// </summary>
/// <returns>The target object.</returns>
/// <exception cref="System.Exception">
/// If unable to obtain the target object.
/// </exception>
public object GetTarget()
{
return target;
}
/// <summary>
/// Releases the target object.
/// </summary>
/// <remarks>
/// <p>
/// No-op implementation.
/// </p>
/// </remarks>
/// <param name="target">The target object to release.</param>
public void ReleaseTarget(object target)
{
}
#endregion
/// <summary>
/// Returns a stringified representation of this target source.
/// </summary>
/// <returns>
/// A stringified representation of this target source.
/// </returns>
public override string ToString()
{
return "Singleton target source (not dynamic): target=[" + target + "]";
}
/// <summary>
/// Determines whether the specified <see cref="System.Object"/>
/// is equal to the current <see cref="System.Object"/>.
/// </summary>
/// <param name="other">The target source to compare with.</param>
/// <returns>
/// <see langword="true"/> if this instance is equal to the
/// specified <see cref="System.Object"/>.
/// </returns>
public override bool Equals(object other)
{
if (this == other)
{
return true;
}
SingletonTargetSource b = other as SingletonTargetSource;
if (b == null)
{
return false;
}
return target.Equals(b.target);
}
/// <summary>
/// Serves as a hash function for a particular type, suitable for use
/// in hashing algorithms and data structures like a hash table.
/// </summary>
/// <returns>
/// A hash code for the current <see cref="System.Object"/>.
/// </returns>
public override int GetHashCode()
{
return base.GetHashCode() + 13 *
(target == null ? 0 : target.GetHashCode());
}
}
}
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