BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Log/Log4net/Util/PatternStringConverters/RandomStringPatternConverter.cs

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#region Apache License
//
// Licensed to the Apache Software Foundation (ASF) under one or more 
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership. 
// The ASF licenses this file to you 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.Text;
using System.IO;

using log4net.Util;
using log4net.DateFormatter;
using log4net.Core;

namespace log4net.Util.PatternStringConverters
{
	/// <summary>
	/// A Pattern converter that generates a string of random characters
	/// </summary>
	/// <remarks>
	/// <para>
	/// The converter generates a string of random characters. By default
	/// the string is length 4. This can be changed by setting the <see cref="PatternConverter.Option"/>
	/// to the string value of the length required.
	/// </para>
	/// <para>
	/// The random characters in the string are limited to uppercase letters
	/// and numbers only.
	/// </para>
	/// <para>
	/// The random number generator used by this class is not cryptographically secure.
	/// </para>
	/// </remarks>
	/// <author>Nicko Cadell</author>
	internal sealed class RandomStringPatternConverter : PatternConverter, IOptionHandler
	{
		/// <summary>
		/// Shared random number generator
		/// </summary>
		private static readonly Random s_random = new Random();

		/// <summary>
		/// Length of random string to generate. Default length 4.
		/// </summary>
		private int m_length = 4;

		#region Implementation of IOptionHandler