/// <summary>
        /// Create a copy of this iterator </summary>
        /// <returns> A copy of this </returns>
        public virtual Object Clone()
        {
            CharArrayIterator c = new CharArrayIterator(Chars, Begin);

            c.Pos = this.Pos;
            return(c);
        }
        public virtual void TestConsumeSentenceInstance()
        {
            // we use the default locale, as its randomized by LuceneTestCase
            var bi = BreakIterator.CreateSentenceInstance(Locale.GetUS());
            var ci = CharArrayIterator.NewSentenceInstance();

            for (var i = 0; i < 10000; i++)
            {
                var text = TestUtil.RandomUnicodeString(Random()).toCharArray();
                ci.SetText(text, 0, text.Length);
                Consume(bi, ci);
            }
        }
        private string CharacterIteratorToString()
        {
            string fullText;

            if (text is CharArrayIterator)
            {
                CharArrayIterator charArrayIterator = (CharArrayIterator)text;
                fullText = new string(charArrayIterator.Text, charArrayIterator.Start, charArrayIterator.Length);
            }
            else
            {
                // TODO: is there a better way to extract full text from arbitrary CharacterIterators?
                StringBuilder builder = new StringBuilder();
                for (char ch = text.First(); ch != CharacterIterator.Done; ch = text.Next())
                {
                    builder.Append(ch);
                }
                fullText = builder.ToString();
                text.SetIndex(text.BeginIndex);
            }
            return(fullText);
        }
 public virtual void TestSentenceInstance()
 {
     DoTests(CharArrayIterator.NewSentenceInstance());
 }
 public virtual void TestWordInstance()
 {
     DoTests(CharArrayIterator.NewWordInstance());
 }
        /* run this to test if your JRE is buggy
         * public void testSentenceInstanceJREBUG() {
         * // we use the default locale, as its randomized by LuceneTestCase
         * BreakIterator bi = BreakIterator.getSentenceInstance(Locale.getDefault());
         * Segment ci = new Segment();
         * for (int i = 0; i < 10000; i++) {
         *  char text[] = TestUtil.randomUnicodeString(random).toCharArray();
         *  ci.array = text;
         *  ci.offset = 0;
         *  ci.count = text.length;
         *  consume(bi, ci);
         * }
         * }
         */

        private void DoTests(CharArrayIterator ci)
        {
            // basics
            ci.SetText("testing".ToCharArray(), 0, "testing".Length);
            assertEquals(0, ci.BeginIndex);
            assertEquals(7, ci.EndIndex);
            assertEquals(0, ci.Index);
            assertEquals('t', ci.Current());
            assertEquals('e', ci.Next());
            assertEquals('g', ci.Last());
            assertEquals('n', ci.Previous());
            assertEquals('t', ci.First());
            assertEquals(CharacterIterator.DONE, ci.Previous());

            // first()
            ci.SetText("testing".ToCharArray(), 0, "testing".Length);
            ci.Next();
            // Sets the position to getBeginIndex() and returns the character at that position.
            assertEquals('t', ci.First());
            assertEquals(ci.BeginIndex, ci.Index);
            // or DONE if the text is empty
            ci.SetText(new char[] { }, 0, 0);
            assertEquals(CharacterIterator.DONE, ci.First());

            // last()
            ci.SetText("testing".ToCharArray(), 0, "testing".Length);
            // Sets the position to getEndIndex()-1 (getEndIndex() if the text is empty)
            // and returns the character at that position.
            assertEquals('g', ci.Last());
            assertEquals(ci.Index, ci.EndIndex - 1);
            // or DONE if the text is empty
            ci.SetText(new char[] { }, 0, 0);
            assertEquals(CharacterIterator.DONE, ci.Last());
            assertEquals(ci.EndIndex, ci.Index);

            // current()
            // Gets the character at the current position (as returned by getIndex()).
            ci.SetText("testing".ToCharArray(), 0, "testing".Length);
            assertEquals('t', ci.Current());
            ci.Last();
            ci.Next();
            // or DONE if the current position is off the end of the text.
            assertEquals(CharacterIterator.DONE, ci.Current());

            // next()
            ci.SetText("te".ToCharArray(), 0, 2);
            // Increments the iterator's index by one and returns the character at the new index.
            assertEquals('e', ci.Next());
            assertEquals(1, ci.Index);
            // or DONE if the new position is off the end of the text range.
            assertEquals(CharacterIterator.DONE, ci.Next());
            assertEquals(ci.EndIndex, ci.Index);

            // setIndex()
            ci.SetText("test".ToCharArray(), 0, "test".Length);
            try
            {
                ci.SetIndex(5);
                fail();
            }
            catch (Exception e)
            {
                assertTrue(e is System.ArgumentException);
            }

            // clone()
            var text = "testing".ToCharArray();

            ci.SetText(text, 0, text.Length);
            ci.Next();
            var ci2 = ci.Clone() as CharArrayIterator;

            assertEquals(ci.Index, ci2.Index);
            assertEquals(ci.Next(), ci2.Next());
            assertEquals(ci.Last(), ci2.Last());
        }