org.elasticsearch.search.facet.terms.unmapped.UnmappedFieldExecutor Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon 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.search.facet.terms.unmapped;
import com.google.common.collect.ImmutableList;
import org.apache.lucene.index.AtomicReaderContext;
import org.elasticsearch.search.facet.FacetExecutor;
import org.elasticsearch.search.facet.InternalFacet;
import org.elasticsearch.search.facet.terms.TermsFacet;
import org.elasticsearch.search.facet.terms.strings.InternalStringTermsFacet;
import java.io.IOException;
import java.util.Collection;
/**
* A facet executor that only aggregates the missing count for unmapped fields and builds a terms facet over it
*/
public class UnmappedFieldExecutor extends FacetExecutor {
final int size;
final TermsFacet.ComparatorType comparatorType;
long missing;
public UnmappedFieldExecutor(int size, TermsFacet.ComparatorType comparatorType) {
this.size = size;
this.comparatorType = comparatorType;
}
@Override
public InternalFacet buildFacet(String facetName) {
Collection entries = ImmutableList.of();
return new InternalStringTermsFacet(facetName, comparatorType, size, entries, missing, 0);
}
@Override
public Collector collector() {
return new Collector();
}
final class Collector extends FacetExecutor.Collector {
private long missing;
@Override
public void postCollection() {
UnmappedFieldExecutor.this.missing = missing;
}
@Override
public void collect(int doc) throws IOException {
missing++;
}
@Override
public void setNextReader(AtomicReaderContext context) throws IOException {
}
}
}