/*
* 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.search.facet;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.Scorer;
import org.elasticsearch.common.collect.ImmutableList;
import org.elasticsearch.common.lucene.docset.DocSet;
import org.elasticsearch.common.lucene.docset.DocSets;
import org.elasticsearch.common.lucene.search.AndFilter;
import java.io.IOException;
/**
* @author kimchy (shay.banon)
*/
public abstract class AbstractFacetCollector extends FacetCollector {
protected final String facetName;
protected Filter filter;
private DocSet docSet = null;
public AbstractFacetCollector(String facetName) {
this.facetName = facetName;
}
public Filter getFilter() {
return this.filter;
}
@Override public void setFilter(Filter filter) {
if (this.filter == null) {
this.filter = filter;
} else {
this.filter = new AndFilter(ImmutableList.of(filter, this.filter));
}
}
@Override public void setScorer(Scorer scorer) throws IOException {
// usually, there is nothing to do here
}
@Override public boolean acceptsDocsOutOfOrder() {
return true; // when working on FieldData, docs can be out of order
}
@Override public void setNextReader(IndexReader reader, int docBase) throws IOException {
if (filter != null) {
docSet = DocSets.convert(reader, filter.getDocIdSet(reader));
}
doSetNextReader(reader, docBase);
}
protected abstract void doSetNextReader(IndexReader reader, int docBase) throws IOException;
@Override public void collect(int doc) throws IOException {
if (docSet == null) {
doCollect(doc);
} else if (docSet.get(doc)) {
doCollect(doc);
}
}
protected abstract void doCollect(int doc) throws IOException;
}