/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.PayloadAttribute;
import org.apache.lucene.index.Payload;
import java.io.IOException;
import static org.apache.lucene.analysis.payloads.PayloadHelper.*;
/**
* @author kimchy (shay.banon)
*/
public final class AllTokenStream extends TokenFilter {
public static TokenStream allTokenStream(String allFieldName, AllEntries allEntries, Analyzer analyzer) throws IOException {
return new AllTokenStream(analyzer.reusableTokenStream(allFieldName, allEntries), allEntries);
}
private final AllEntries allEntries;
private final PayloadAttribute payloadAttribute;
AllTokenStream(TokenStream input, AllEntries allEntries) {
super(input);
this.allEntries = allEntries;
payloadAttribute = addAttribute(PayloadAttribute.class);
}
public AllEntries allEntries() {
return allEntries;
}
@Override public final boolean incrementToken() throws IOException {
if (!input.incrementToken()) {
return false;
}
if (allEntries.current() != null) {
float boost = allEntries.current().boost();
if (boost != 1.0f) {
payloadAttribute.setPayload(new Payload(encodeFloat(boost)));
} else {
payloadAttribute.setPayload(null);
}
}
return true;
}
@Override public String toString() {
return allEntries.toString();
}
}