/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2004 The Apache Software Foundation.  All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. The end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:
*       "This product includes software developed by the
*        Apache Software Foundation (http://www.apache.org/)."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
*    "Apache Lucene" must not be used to endorse or promote products
*    derived from this software without prior written permission. For
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*
* 5. Products derived from this software may not be called "Apache",
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*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation.  For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/

using System;
using NUnit.Framework;
using Lucene.Net.Analysis;

namespace Lucene.Net.Analysis.Snowball
{
	[TestFixture]
	public class TestSnowball
	{
		private class AnonymousClassTokenStream : TokenStream
		{
			public AnonymousClassTokenStream(Token tok, TestSnowball enclosingInstance)
			{
				InitBlock(tok, enclosingInstance);
			}
			private void  InitBlock(Token tok, TestSnowball enclosingInstance)
			{
				this.tok = tok;
				this.enclosingInstance = enclosingInstance;
			}
			private Token tok;
			private TestSnowball enclosingInstance;
			public TestSnowball Enclosing_Instance
			{
				get
				{
					return enclosingInstance;
				}
				
			}
            public override Token Next()
			{
				return tok;
			}
		}
		
		public virtual void  AssertAnalyzesTo(Analyzer a, System.String input, System.String[] output)
		{
			TokenStream ts = a.TokenStream("dummy", new System.IO.StringReader(input));
			for (int i = 0; i < output.Length; i++)
			{
				Token t = ts.Next();
				Assert.IsNotNull(t);
				Assert.AreEqual(output[i], t.TermText());
			}
			Assert.IsNull(ts.Next());
			ts.Close();
		}
		[Test]
		public virtual void  TestEnglish()
		{
			Analyzer a = new SnowballAnalyzer("English");
			AssertAnalyzesTo(a, "he abhorred accents", new System.String[]{"he", "abhor", "accent"});
		}
		[Test]
		public virtual void  TestFilterTokens()
		{
			Token tok = new Token("accents", 2, 7, "wrd");
			tok.SetPositionIncrement(3);
			
			SnowballFilter filter = new SnowballFilter(new AnonymousClassTokenStream(tok, this), "English");
			
			Token newtok = filter.Next();
			
			Assert.AreEqual("accent", newtok.TermText());
			Assert.AreEqual(2, newtok.StartOffset());
			Assert.AreEqual(7, newtok.EndOffset());
			Assert.AreEqual("wrd", newtok.Type());
			Assert.AreEqual(3, newtok.GetPositionIncrement());
		}
	}
}
