#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 System.Reflection;
using Spring.Core;
#endregion
namespace Spring.Core{
/// <summary>
/// Criteria that is satisfied if the number of parameters to a given
/// <see cref="System.Reflection.MethodBase"/> matches an arbitrary number.
/// </summary>
/// <remarks>
/// <p>
/// This class supports checking the parameter count of both methods and
/// constructors.
/// </p>
/// <p>
/// Default parameters, etc need to taken into account.
/// </p>
/// </remarks>
/// <author>Rick Evans</author>
public class MethodParametersCountCriteria : ICriteria
{
#region Constructor (s) / Destructor
/// <summary>
/// Creates a new instance of the
/// <see cref="MethodParametersCountCriteria"/> class.
/// </summary>
/// <remarks>
/// <p>
/// This constructor sets the
/// <see cref="MethodParametersCountCriteria.ExpectedParameterCount"/>
/// property to zero (0).
/// </p>
/// </remarks>
public MethodParametersCountCriteria() : this(0)
{
}
/// <summary>
/// Creates a new instance of the
/// <see cref="MethodParametersCountCriteria"/> class.
/// </summary>
/// <param name="expectedParameterCount">
/// The number of parameters that a <see cref="System.Reflection.MethodInfo"/>
/// must have to satisfy this criteria.
/// </param>
/// <exception cref="System.ArgumentException">
/// If the supplied <paramref name="expectedParameterCount"/> is less
/// than zero.
/// </exception>
public MethodParametersCountCriteria(int expectedParameterCount)
{
ExpectedParameterCount = expectedParameterCount;
}
#endregion
#region Properties
/// <summary>
/// The number of parameters that a <see cref="System.Reflection.MethodInfo"/>
/// must have to satisfy this criteria.
/// </summary>
/// <exception cref="System.ArgumentException">
/// If the supplied value is less than zero.
/// </exception>
public int ExpectedParameterCount
{
get { return _count; }
set
{
if (value < 0)
{
throw new ArgumentOutOfRangeException(
"value", value, "Cannot specify a parameter count of less than zero.");
}
_count = value;
}
}
#endregion
#region Methods
/// <summary>
/// Does the supplied <paramref name="datum"/> satisfy the criteria encapsulated by
/// this instance?
/// </summary>
/// <param name="datum">The datum to be checked by this criteria instance.</param>
/// <returns>
/// True if the supplied <paramref name="datum"/> satisfies the criteria encapsulated
/// by this instance; false if not or the supplied <paramref name="datum"/> is null.
/// </returns>
public bool IsSatisfied(object datum)
{
bool satisfied = false;
MethodBase method = datum as MethodBase;
if (method != null)
{
ParameterInfo[] parameters = method.GetParameters();
if (parameters.Length == ExpectedParameterCount)
{
satisfied = true;
}
else if ((parameters.Length > 0) && (ExpectedParameterCount >= parameters.Length-1))
{
ParameterInfo lastParameter = parameters[parameters.Length - 1];
satisfied = lastParameter.GetCustomAttributes(typeof(ParamArrayAttribute), false).Length > 0;
}
}
return satisfied;
}
#endregion
#region Fields
private int _count;
#endregion
}
}
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