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 TokenStream.
<p>
This is an abstract class; subclasses must override {@link #incrementToken()}.
@see TokenStream
*/
public abstract class TokenFilter extends TokenStream {
/** The source of tokens for this filter. */
protected final TokenStream input;
/** Construct a token stream filtering the given input. */
protected TokenFilter(TokenStream input) {
super(input);
this.input = input;
}
/** Performs end-of-stream operations, if any, and calls then <code>end()</code> on the
* input TokenStream.<p/>
* <b>NOTE:</b> Be sure to call <code>super.end()</code> first when overriding this method.*/
@Override
public void end() throws IOException {
input.end();
}
/** Close the input TokenStream. */
@Override
public void close() throws IOException {
input.close();
}
/** Reset the filter as well as the input TokenStream. */
@Override
public void reset() throws IOException {
input.reset();
}
}