package org.apache.lucene.analysis.miscellaneous;
/**
* 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.analysis.Token;
import org.apache.lucene.analysis.TokenStream;
import java.io.IOException;
/**
* Links two {@link PrefixAwareTokenFilter}.
* <p/>
* <b>NOTE:</b> This filter might not behave correctly if used with custom Attributes, i.e. Attributes other than
* the ones located in org.apache.lucene.analysis.tokenattributes.
*/
public class PrefixAndSuffixAwareTokenFilter extends TokenStream {
private PrefixAwareTokenFilter suffix;
public PrefixAndSuffixAwareTokenFilter(TokenStream prefix, TokenStream input, TokenStream suffix) {
super(suffix);
prefix = new PrefixAwareTokenFilter(prefix, input) {
public Token updateSuffixToken(Token suffixToken, Token lastInputToken) {
return PrefixAndSuffixAwareTokenFilter.this.updateInputToken(suffixToken, lastInputToken);
}
};
this.suffix = new PrefixAwareTokenFilter(prefix, suffix) {
public Token updateSuffixToken(Token suffixToken, Token lastInputToken) {
return PrefixAndSuffixAwareTokenFilter.this.updateSuffixToken(suffixToken, lastInputToken);
}
};
}
public Token updateInputToken(Token inputToken, Token lastPrefixToken) {
inputToken.setStartOffset(lastPrefixToken.endOffset() + inputToken.startOffset());
inputToken.setEndOffset(lastPrefixToken.endOffset() + inputToken.endOffset());
return inputToken;
}
public Token updateSuffixToken(Token suffixToken, Token lastInputToken) {
suffixToken.setStartOffset(lastInputToken.endOffset() + suffixToken.startOffset());
suffixToken.setEndOffset(lastInputToken.endOffset() + suffixToken.endOffset());
return suffixToken;
}
public final boolean incrementToken() throws IOException {
return suffix.incrementToken();
}
/** @deprecated Will be removed in Lucene 3.0. This method is final, as it should
* not be overridden. Delegates to the backwards compatibility layer. */
public final Token next(final Token reusableToken) throws java.io.IOException {
return super.next(reusableToken);
}
/** @deprecated Will be removed in Lucene 3.0. This method is final, as it should
* not be overridden. Delegates to the backwards compatibility layer. */
public final Token next() throws java.io.IOException {
return super.next();
}
public void reset() throws IOException {
suffix.reset();
}
public void close() throws IOException {
suffix.close();
}
}