#region Apache License
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//
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// Licensed to the Apache Software Foundation (ASF) under one or more
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// contributor license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright ownership.
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// The ASF licenses this file to you under the Apache License, Version 2.0
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// (the "License"); you may not use this file except in compliance with
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// the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#endregion
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// .NET Compact Framework 1.0 has no support for ASP.NET
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// SSCLI 1.0 has no support for ASP.NET
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#if !NETCF && !SSCLI && !CLIENT_PROFILE
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using System.IO;
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using System.Web;
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using log4net.Core;
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using log4net.Util;
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namespace log4net.Layout.Pattern
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{
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/// <summary>
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/// Abstract class that provides access to the current HttpContext (<see cref="HttpContext.Current" />) that
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/// derived classes need.
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/// </summary>
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/// <remarks>
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/// This class handles the case when HttpContext.Current is null by writing
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/// <see cref="SystemInfo.NotAvailableText" /> to the writer.
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/// </remarks>
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/// <author>Ron Grabowski</author>
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internal abstract class AspNetPatternLayoutConverter : PatternLayoutConverter
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{
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protected override void Convert(TextWriter writer, LoggingEvent loggingEvent)
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{
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if (HttpContext.Current == null)
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{
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writer.Write(SystemInfo.NotAvailableText);
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}
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else
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{
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Convert(writer, loggingEvent, HttpContext.Current);
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}
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}
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/// <summary>
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/// Derived pattern converters must override this method in order to
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/// convert conversion specifiers in the correct way.
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/// </summary>
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/// <param name="writer"><see cref="TextWriter" /> that will receive the formatted result.</param>
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/// <param name="loggingEvent">The <see cref="LoggingEvent" /> on which the pattern converter should be executed.</param>
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/// <param name="httpContext">The <see cref="HttpContext" /> under which the ASP.Net request is running.</param>
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protected abstract void Convert(TextWriter writer, LoggingEvent loggingEvent, HttpContext httpContext);
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}
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}
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#endif
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