org.elasticsearch.common.lucene.all.AllField Maven / Gradle / Ivy
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package org.elasticsearch.common.lucene.all;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.FieldType;
import org.apache.lucene.index.IndexOptions;
public class AllField extends Field {
private final float boost;
public AllField(String name, String value, float boost, FieldType fieldType) {
super(name, value, fieldType);
this.boost = boost;
}
@Override
public TokenStream tokenStream(Analyzer analyzer, TokenStream previous) {
TokenStream ts = analyzer.tokenStream(name(), stringValue());
if (boost != 1.0f && fieldType().indexOptions().compareTo(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS) >= 0) {
// TODO: we should be able to reuse "previous" if its instanceof AllTokenStream?
// but we need to be careful this optimization is safe (and tested)...
// AllTokenStream maps boost to 4-byte payloads, so we only need to use it any field had non-default (!= 1.0f) boost and if
// positions are indexed:
return new AllTokenStream(ts, boost);
}
return ts;
}
}