using System;

namespace Lucene.Net.Util
{

	/*
	 * 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.
	 */

	using FieldCache = Lucene.Net.Search.FieldCache;
	/*using TestRule = org.junit.rules.TestRule;
	using Description = org.junit.runner.Description;
	using Statement = org.junit.runners.model.Statement;*/

	/// <summary>
	/// this rule will fail the test if it has insane field caches.
	/// <p>
	/// calling assertSaneFieldCaches here isn't as useful as having test
	/// classes call it directly from the scope where the index readers
	/// are used, because they could be gc'ed just before this tearDown
	/// method is called.
	/// <p>
	/// But it's better then nothing.
	/// <p>
	/// If you are testing functionality that you know for a fact
	/// "violates" FieldCache sanity, then you should either explicitly
	/// call purgeFieldCache at the end of your test method, or refactor
	/// your Test class so that the inconsistent FieldCache usages are
	/// isolated in distinct test methods
	/// </summary>
	/// <seealso cref= FieldCacheSanityChecker </seealso>
	public class TestRuleFieldCacheSanity : TestRule
	{

	  public override Statement Apply(Statement s, Description d)
	  {
		return new StatementAnonymousInnerClassHelper(this, s, d);
	  }

	  private class StatementAnonymousInnerClassHelper : Statement
	  {
		  private readonly TestRuleFieldCacheSanity OuterInstance;

		  private Statement s;
		  private Description d;

		  public StatementAnonymousInnerClassHelper(TestRuleFieldCacheSanity outerInstance, Statement s, Description d)
		  {
			  this.OuterInstance = outerInstance;
			  this.s = s;
			  this.d = d;
		  }

		  public override void Evaluate()
		  {
			s.evaluate();

			Exception problem = null;
			try
			{
			  LuceneTestCase.AssertSaneFieldCaches(d.DisplayName);
			}
			catch (Exception t)
			{
			  problem = t;
			}

			FieldCache.DEFAULT.purgeAllCaches();

			if (problem != null)
			{
			  Rethrow.Rethrow(problem);
			}
		  }
	  }
	}

}