?? tokenstream.java
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package util.word;/** * Copyright 2004 The Apache Software Foundation * * Licensed 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 TokenStream enumerates the sequence of tokens, either from fields of a document or from query text. <p> This is an abstract class. Concrete subclasses are: <ul> <li>{@link Tokenizer}, a TokenStream whose input is a Reader; and <li>{@link TokenFilter}, a TokenStream whose input is another TokenStream. </ul> */public abstract class TokenStream { /** Returns the next token in the stream, or null at EOS. */ public abstract Token next() throws IOException; /** Releases resources associated with this stream. */ public void close() throws IOException {}}
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