org.apache.lucene.analysis.miscellaneous.SingleTokenTokenStream Maven / Gradle / Ivy
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 java.io.IOException;
import org.apache.lucene.util.AttributeImpl;
import org.apache.lucene.analysis.Token;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.TermAttribute;
/**
* A {@link TokenStream} containing a single token.
*/
public final class SingleTokenTokenStream extends TokenStream {
private boolean exhausted = false;
// The token needs to be immutable, so work with clones!
private Token singleToken;
private final AttributeImpl tokenAtt;
public SingleTokenTokenStream(Token token) {
super(Token.TOKEN_ATTRIBUTE_FACTORY);
assert token != null;
this.singleToken = (Token) token.clone();
tokenAtt = (AttributeImpl) addAttribute(TermAttribute.class);
assert (tokenAtt instanceof Token);
}
@Override
public final boolean incrementToken() throws IOException {
if (exhausted) {
return false;
} else {
clearAttributes();
singleToken.copyTo(tokenAtt);
exhausted = true;
return true;
}
}
@Override
public void reset() throws IOException {
exhausted = false;
}
public Token getToken() {
return (Token) singleToken.clone();
}
public void setToken(Token token) {
this.singleToken = (Token) token.clone();
}
}