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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.elasticsearch.common.lucene.all;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.PayloadAttribute;
import org.apache.lucene.util.BytesRef;
import java.io.IOException;
import static org.apache.lucene.analysis.payloads.PayloadHelper.encodeFloat;
/**
*
*/
public final class AllTokenStream extends TokenFilter {
public static TokenStream allTokenStream(String allFieldName, AllEntries allEntries, Analyzer analyzer) throws IOException {
return new AllTokenStream(analyzer.tokenStream(allFieldName, allEntries), allEntries);
}
private final BytesRef payloadSpare = new BytesRef(new byte[4]);
private final AllEntries allEntries;
private final OffsetAttribute offsetAttribute;
private final PayloadAttribute payloadAttribute;
AllTokenStream(TokenStream input, AllEntries allEntries) {
super(input);
this.allEntries = allEntries;
offsetAttribute = addAttribute(OffsetAttribute.class);
payloadAttribute = addAttribute(PayloadAttribute.class);
}
public AllEntries allEntries() {
return allEntries;
}
@Override
public final boolean incrementToken() throws IOException {
if (!input.incrementToken()) {
return false;
}
final float boost = allEntries.boost(offsetAttribute.startOffset());
if (boost != 1.0f) {
encodeFloat(boost, payloadSpare.bytes, payloadSpare.offset);
payloadAttribute.setPayload(payloadSpare);
} else {
payloadAttribute.setPayload(null);
}
return true;
}
@Override
public String toString() {
return allEntries.toString();
}
}