+++ /dev/null
-package org.apache.lucene.analysis;
-
-/**
- * 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 org.apache.lucene.util.AttributeSource;
-
-import java.io.Reader;
-import java.io.IOException;
-
-/** A Tokenizer is a TokenStream whose input is a Reader.
- <p>
- This is an abstract class; subclasses must override {@link #incrementToken()}
- <p>
- NOTE: Subclasses overriding {@link #incrementToken()} must
- call {@link AttributeSource#clearAttributes()} before
- setting attributes.
- */
-public abstract class Tokenizer extends TokenStream {
- /** The text source for this Tokenizer. */
- protected Reader input;
-
- /** Construct a tokenizer with null input. */
- protected Tokenizer() {}
-
- /** Construct a token stream processing the given input. */
- protected Tokenizer(Reader input) {
- this.input = CharReader.get(input);
- }
-
- /** Construct a tokenizer with null input using the given AttributeFactory. */
- protected Tokenizer(AttributeFactory factory) {
- super(factory);
- }
-
- /** Construct a token stream processing the given input using the given AttributeFactory. */
- protected Tokenizer(AttributeFactory factory, Reader input) {
- super(factory);
- this.input = CharReader.get(input);
- }
-
- /** Construct a token stream processing the given input using the given AttributeSource. */
- protected Tokenizer(AttributeSource source) {
- super(source);
- }
-
- /** Construct a token stream processing the given input using the given AttributeSource. */
- protected Tokenizer(AttributeSource source, Reader input) {
- super(source);
- this.input = CharReader.get(input);
- }
-
- /** By default, closes the input Reader. */
- @Override
- public void close() throws IOException {
- if (input != null) {
- input.close();
- // LUCENE-2387: don't hold onto Reader after close, so
- // GC can reclaim
- input = null;
- }
- }
-
- /** Return the corrected offset. If {@link #input} is a {@link CharStream} subclass
- * this method calls {@link CharStream#correctOffset}, else returns <code>currentOff</code>.
- * @param currentOff offset as seen in the output
- * @return corrected offset based on the input
- * @see CharStream#correctOffset
- */
- protected final int correctOffset(int currentOff) {
- return (input instanceof CharStream) ? ((CharStream) input).correctOffset(currentOff) : currentOff;
- }
-
- /** Expert: Reset the tokenizer to a new reader. Typically, an
- * analyzer (in its reusableTokenStream method) will use
- * this to re-use a previously created tokenizer. */
- public void reset(Reader input) throws IOException {
- this.input = input;
- }
-}
-