/* 
 * 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 System;

using NUnit.Framework;

namespace Lucene.Net.Store
{
	
	/// <summary> Used by MockRAMDirectory to create an input stream that
	/// keeps track of when it's been closed.
	/// </summary>
	
	public class MockRAMInputStream:RAMInputStream, System.ICloneable
	{
		private MockRAMDirectory dir;
		private System.String name;
		private bool isClone;
		
		/// <summary>Construct an empty output buffer. </summary>
		/// <throws>  IOException  </throws>
		public MockRAMInputStream(MockRAMDirectory dir, System.String name, RAMFile f):base(f)
		{
			this.name = name;
			this.dir = dir;
		}
		
		public override void  Close()
		{
			base.Close();
			// Pending resolution on LUCENE-686 we may want to
			// remove the conditional check so we also track that
			// all clones get closed:
			if (!isClone)
			{
				lock (dir)
				{
					// Could be null when MockRAMDirectory.crash() was called
					if (dir.openFiles[name] != null)
					{
						System.Int32 v = (System.Int32) dir.openFiles[name];
						if (v == 1)
						{
							dir.openFiles.Remove(name);
						}
						else
						{
							v = (System.Int32) (v - 1);
							dir.openFiles[name] = v;
						}
					}
				}
			}
		}
		
		public override System.Object Clone()
		{
			MockRAMInputStream clone = (MockRAMInputStream) base.Clone();
			clone.isClone = true;
			// Pending resolution on LUCENE-686 we may want to
			// uncomment this code so that we also track that all
			// clones get closed:
			/*
			synchronized(dir.openFiles) {
			if (dir.openFiles.containsKey(name)) {
			Integer v = (Integer) dir.openFiles.get(name);
			v = new Integer(v.intValue()+1);
			dir.openFiles.put(name, v);
			} else {
			throw new RuntimeException("BUG: cloned file was not open?");
			}
			}
			*/
			return clone;
		}
	}
}