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XStringField.java
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XStringField.java
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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.
*/
package org.apache.lucene.document;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.util.CloseableThreadLocal;
import java.io.IOException;
/**
* A string/text field that optimizes the case for non analyzed fields to reuse a thread local token
* stream (instead of creating it each time). This reduces analysis chain overhead and object creation
* (which is significant, yay Attributes).
* <p/>
* Not to be confused with Lucene StringField, this handles analyzed text as well, and relies on providing
* the FieldType. Couldn't come up with a good name for this that is different from Text/String...
*/
public class XStringField extends Field {
private static final CloseableThreadLocal<StringTokenStream> NOT_ANALYZED_TOKENSTREAM = new CloseableThreadLocal<StringTokenStream>() {
@Override
protected StringTokenStream initialValue() {
return new StringTokenStream();
}
};
public XStringField(String name, String value, FieldType fieldType) {
super(name, fieldType);
fieldsData = value;
}
@Override
public TokenStream tokenStream(Analyzer analyzer) throws IOException {
if (!fieldType().indexed()) {
return null;
}
// Only use the cached TokenStream if the value is indexed and not-tokenized
if (fieldType().tokenized()) {
return super.tokenStream(analyzer);
}
StringTokenStream nonAnalyzedTokenStream = NOT_ANALYZED_TOKENSTREAM.get();
nonAnalyzedTokenStream.setValue((String) fieldsData);
return nonAnalyzedTokenStream;
}
}