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package org.apache.lucene.analysis.ru;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.io.Reader;
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import org.apache.lucene.analysis.CharTokenizer;
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import org.apache.lucene.analysis.Tokenizer; // for javadocs
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import org.apache.lucene.analysis.LetterTokenizer; // for javadocs
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import org.apache.lucene.analysis.standard.StandardTokenizer; // for javadocs
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import org.apache.lucene.util.AttributeSource;
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import org.apache.lucene.util.Version;
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* A RussianLetterTokenizer is a {@link Tokenizer} that extends {@link LetterTokenizer}
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* by also allowing the basic Latin digits 0-9.
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* You must specify the required {@link Version} compatibility when creating
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* {@link RussianLetterTokenizer}:
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* <li>As of 3.1, {@link CharTokenizer} uses an int based API to normalize and
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* detect token characters. See {@link CharTokenizer#isTokenChar(int)} and
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* {@link CharTokenizer#normalize(int)} for details.</li>
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* @deprecated Use {@link StandardTokenizer} instead, which has the same functionality.
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* This filter will be removed in Lucene 5.0
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public class RussianLetterTokenizer extends CharTokenizer
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private static final int DIGIT_0 = '0';
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private static final int DIGIT_9 = '9';
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* Construct a new RussianLetterTokenizer. * @param matchVersion Lucene version
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* to match See {@link <a href="#version">above</a>}
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* the input to split up into tokens
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public RussianLetterTokenizer(Version matchVersion, Reader in) {
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super(matchVersion, in);
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* Construct a new RussianLetterTokenizer using a given {@link AttributeSource}.
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* Lucene version to match See {@link <a href="#version">above</a>}
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* the attribute source to use for this {@link Tokenizer}
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* the input to split up into tokens
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public RussianLetterTokenizer(Version matchVersion, AttributeSource source, Reader in) {
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super(matchVersion, source, in);
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* Construct a new RussianLetterTokenizer using a given
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* {@link org.apache.lucene.util.AttributeSource.AttributeFactory}. * @param
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* matchVersion Lucene version to match See
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* {@link <a href="#version">above</a>}
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* the attribute factory to use for this {@link Tokenizer}
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* the input to split up into tokens
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public RussianLetterTokenizer(Version matchVersion, AttributeFactory factory, Reader in) {
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super(matchVersion, factory, in);
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* Construct a new RussianLetterTokenizer.
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* @deprecated use {@link #RussianLetterTokenizer(Version, Reader)} instead. This will
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* be removed in Lucene 4.0.
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public RussianLetterTokenizer(Reader in) {
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* Construct a new RussianLetterTokenizer using a given {@link AttributeSource}.
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* @deprecated use {@link #RussianLetterTokenizer(Version, AttributeSource, Reader)}
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* instead. This will be removed in Lucene 4.0.
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public RussianLetterTokenizer(AttributeSource source, Reader in) {
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* Construct a new RussianLetterTokenizer using a given
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* {@link org.apache.lucene.util.AttributeSource.AttributeFactory}.
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* @deprecated use {@link #RussianLetterTokenizer(Version, AttributeSource.AttributeFactory, Reader)}
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* instead. This will be removed in Lucene 4.0.
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public RussianLetterTokenizer(AttributeFactory factory, Reader in) {
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* Collects only characters which satisfy
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* {@link Character#isLetter(int)}.
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protected boolean isTokenChar(int c) {
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return Character.isLetter(c) || (c >= DIGIT_0 && c <= DIGIT_9);