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 java.io.IOException;/** A TokenFilter is a TokenStream whose input is another token stream.  <p>  This is an abstract class.  NOTE: subclasses must override {@link #next(Token)}.  It's  also OK to instead override {@link #next()} but that  method is now deprecated in favor of {@link #next(Token)}.  */public abstract class TokenFilter extends TokenStream {  /** The source of tokens for this filter. */  protected TokenStream input;  /** Construct a token stream filtering the given input. */  protected TokenFilter(TokenStream input) {    this.input = input;  }  /** Close the input TokenStream. */  public void close() throws IOException {    input.close();  }  /** Reset the filter as well as the input TokenStream. */  public void reset() throws IOException {    super.reset();    input.reset();  }}