#region License
/*
* Copyright 2002-2007 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 Common.Logging;
using Spring.Expressions;
namespace Spring.Aspects{
/// <summary>
/// An abstract base class providing all necessary functionality for typical IExceptionHandler implementations.
/// </summary>
/// <author>Mark Pollack</author>
public abstract class AbstractExceptionHandler : IExceptionHandler
{
#region Fields
/// <summary>
/// The logging instance
/// </summary>
protected readonly ILog log;
private IList sourceExceptionNames = new ArrayList();
private IList sourceExceptionTypes = new ArrayList();
private string actionExpressionText;
private bool continueProcessing = false;
private string constraintExpressionText;
#endregion
#region Constructor(s)
/// <summary>
/// Initializes a new instance of the <see cref="AbstractExceptionHandler"/> class.
/// </summary>
public AbstractExceptionHandler()
{
log = LogManager.GetLogger(GetType());
}
/// <summary>
/// Initializes a new instance of the <see cref="AbstractExceptionHandler"/> class.
/// </summary>
/// <param name="exceptionNames">The exception names.</param>
public AbstractExceptionHandler(string[] exceptionNames)
{
log = LogManager.GetLogger(GetType());
foreach (string exceptionName in exceptionNames)
{
SourceExceptionNames.Add(exceptionName);
}
}
#endregion
#region Implementation of IExceptionHandler
#region Properties
/// <summary>
/// Gets the source exception names.
/// </summary>
/// <value>The source exception names.</value>
public virtual IList SourceExceptionNames
{
get { return sourceExceptionNames; }
set { sourceExceptionNames = value; }
}
/// <summary>
/// Gets the source exception types.
/// </summary>
/// <value>The source exception types.</value>
public virtual IList SourceExceptionTypes
{
get { return sourceExceptionTypes; }
set { sourceExceptionTypes = value; }
}
/// <summary>
/// Gets the action translation expression text
/// </summary>
/// <value>The action translation expression.</value>
public virtual string ActionExpressionText
{
get { return actionExpressionText; }
set { actionExpressionText = value; }
}
/// <summary>
/// Gets or sets the constraint expression text.
/// </summary>
/// <value>The constraint expression text.</value>
public string ConstraintExpressionText
{
get { return constraintExpressionText; }
set { constraintExpressionText = value; }
}
/// <summary>
/// Gets a value indicating whether to continue processing.
/// </summary>
/// <value><c>true</c> if continue processing; otherwise, <c>false</c>.</value>
public bool ContinueProcessing
{
get { return continueProcessing; }
set { continueProcessing = value; }
}
#endregion
/// <summary>
/// Determines whether this instance can handle the exception the specified exception.
/// </summary>
/// <param name="ex">The exception.</param>
/// <param name="callContextDictionary">The call context dictionary.</param>
/// <returns>
/// <c>true</c> if this instance can handle the specified exception; otherwise, <c>false</c>.
/// </returns>
public bool CanHandleException(Exception ex, IDictionary callContextDictionary)
{
if (SourceExceptionNames != null)
{
foreach (string exceptionName in SourceExceptionNames)
{
if (ex.GetType().Name.IndexOf(exceptionName) >= 0)
{
return true;
}
}
}
if (ConstraintExpressionText != null)
{
bool canProcess;
try
{
IExpression expression = Expression.Parse(ConstraintExpressionText);
canProcess = (bool) expression.GetValue(null, callContextDictionary);
} catch (InvalidCastException e)
{
log.Warn("Was not able to unbox constraint expression to boolean [" + ConstraintExpressionText + "]", e);
return false;
} catch (Exception e)
{
log.Warn("Was not able to evaluate constraint expression [" + ConstraintExpressionText + "]",e);
return false;
}
return canProcess;
}
return false;
}
/// <summary>
/// Handles the exception.
/// </summary>
/// <returns>The return value from handling the exception, if not rethrown or a new exception is thrown.</returns>
public abstract object HandleException(IDictionary callContextDictionary);
#endregion
}
}
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