#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 log4net.Core;

namespace log4net.Filter
{
  /// <summary>
  /// This filter drops all <see cref="LoggingEvent"/>. 
  /// </summary>
  /// <remarks>
  /// <para>
  /// You can add this filter to the end of a filter chain to
  /// switch from the default "accept all unless instructed otherwise"
  /// filtering behavior to a "deny all unless instructed otherwise"
  /// behavior.
  /// </para>
  /// </remarks>
  /// <author>Nicko Cadell</author>
  /// <author>Gert Driesen</author>
  public sealed class DenyAllFilter : FilterSkeleton
  {
    /// <summary>
    /// Always returns <see cref="FilterDecision.Deny"/>.
    /// </summary>
    /// <param name="loggingEvent">the LoggingEvent to filter</param>
    /// <returns>Always returns <see cref="FilterDecision.Deny"/></returns>
    /// <remarks>
    /// <para>
    /// Ignores the event being logged and just returns
    /// <see cref="FilterDecision.Deny"/>. This can be used to change the default filter
    /// chain behavior from <see cref="FilterDecision.Accept"/> to <see cref="FilterDecision.Deny"/>. This filter
    /// should only be used as the last filter in the chain
    /// as any further filters will be ignored!
    /// </para>
    /// </remarks>
    public override FilterDecision Decide(LoggingEvent loggingEvent)
    {
      return FilterDecision.Deny;
    }
  }
}
