--- /dev/null
+package org.apache.lucene.analysis.ru;
+
+/**
+ * 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.
+ */
+
+import java.io.Reader;
+import org.apache.lucene.analysis.CharTokenizer;
+import org.apache.lucene.analysis.Tokenizer; // for javadocs
+import org.apache.lucene.analysis.LetterTokenizer; // for javadocs
+import org.apache.lucene.analysis.standard.StandardTokenizer; // for javadocs
+import org.apache.lucene.util.AttributeSource;
+import org.apache.lucene.util.Version;
+
+/**
+ * A RussianLetterTokenizer is a {@link Tokenizer} that extends {@link LetterTokenizer}
+ * by also allowing the basic Latin digits 0-9.
+ * <p>
+ * <a name="version"/>
+ * You must specify the required {@link Version} compatibility when creating
+ * {@link RussianLetterTokenizer}:
+ * <ul>
+ * <li>As of 3.1, {@link CharTokenizer} uses an int based API to normalize and
+ * detect token characters. See {@link CharTokenizer#isTokenChar(int)} and
+ * {@link CharTokenizer#normalize(int)} for details.</li>
+ * </ul>
+ * @deprecated Use {@link StandardTokenizer} instead, which has the same functionality.
+ * This filter will be removed in Lucene 5.0
+ */
+@Deprecated
+public class RussianLetterTokenizer extends CharTokenizer
+{
+ private static final int DIGIT_0 = '0';
+ private static final int DIGIT_9 = '9';
+
+ /**
+ * Construct a new RussianLetterTokenizer. * @param matchVersion Lucene version
+ * to match See {@link <a href="#version">above</a>}
+ *
+ * @param in
+ * the input to split up into tokens
+ */
+ public RussianLetterTokenizer(Version matchVersion, Reader in) {
+ super(matchVersion, in);
+ }
+
+ /**
+ * Construct a new RussianLetterTokenizer using a given {@link AttributeSource}.
+ *
+ * @param matchVersion
+ * Lucene version to match See {@link <a href="#version">above</a>}
+ * @param source
+ * the attribute source to use for this {@link Tokenizer}
+ * @param in
+ * the input to split up into tokens
+ */
+ public RussianLetterTokenizer(Version matchVersion, AttributeSource source, Reader in) {
+ super(matchVersion, source, in);
+ }
+
+ /**
+ * Construct a new RussianLetterTokenizer using a given
+ * {@link org.apache.lucene.util.AttributeSource.AttributeFactory}. * @param
+ * matchVersion Lucene version to match See
+ * {@link <a href="#version">above</a>}
+ *
+ * @param factory
+ * the attribute factory to use for this {@link Tokenizer}
+ * @param in
+ * the input to split up into tokens
+ */
+ public RussianLetterTokenizer(Version matchVersion, AttributeFactory factory, Reader in) {
+ super(matchVersion, factory, in);
+ }
+
+ /**
+ * Construct a new RussianLetterTokenizer.
+ *
+ * @deprecated use {@link #RussianLetterTokenizer(Version, Reader)} instead. This will
+ * be removed in Lucene 4.0.
+ */
+ @Deprecated
+ public RussianLetterTokenizer(Reader in) {
+ super(in);
+ }
+
+ /**
+ * Construct a new RussianLetterTokenizer using a given {@link AttributeSource}.
+ *
+ * @deprecated use {@link #RussianLetterTokenizer(Version, AttributeSource, Reader)}
+ * instead. This will be removed in Lucene 4.0.
+ */
+ @Deprecated
+ public RussianLetterTokenizer(AttributeSource source, Reader in) {
+ super(source, in);
+ }
+
+ /**
+ * Construct a new RussianLetterTokenizer using a given
+ * {@link org.apache.lucene.util.AttributeSource.AttributeFactory}.
+ *
+ * @deprecated use {@link #RussianLetterTokenizer(Version, AttributeSource.AttributeFactory, Reader)}
+ * instead. This will be removed in Lucene 4.0.
+ */
+ @Deprecated
+ public RussianLetterTokenizer(AttributeFactory factory, Reader in) {
+ super(factory, in);
+ }
+
+
+ /**
+ * Collects only characters which satisfy
+ * {@link Character#isLetter(int)}.
+ */
+ @Override
+ protected boolean isTokenChar(int c) {
+ return Character.isLetter(c) || (c >= DIGIT_0 && c <= DIGIT_9);
+ }
+}