package org.apache.lucene.facet.range;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.
*/
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import org.apache.lucene.facet.FacetResult;
import org.apache.lucene.facet.Facets;
import org.apache.lucene.facet.LabelAndValue;
import org.apache.lucene.search.Filter;
/** Base class for range faceting.
*
* @lucene.experimental */
abstract class RangeFacetCounts extends Facets {
/** Ranges passed to constructor. */
protected final Range[] ranges;
/** Counts, initialized in by subclass. */
protected final int[] counts;
/** Optional: if specified, we first test this Filter to
* see whether the document should be checked for
* matching ranges. If this is null, all documents are
* checked. */
protected final Filter fastMatchFilter;
/** Our field name. */
protected final String field;
/** Total number of hits. */
protected int totCount;
/** Create {@code RangeFacetCounts} */
protected RangeFacetCounts(String field, Range[] ranges, Filter fastMatchFilter) throws IOException {
this.field = field;
this.ranges = ranges;
this.fastMatchFilter = fastMatchFilter;
counts = new int[ranges.length];
}
@Override
public FacetResult getTopChildren(int topN, String dim, String... path) {
if (dim.equals(field) == false) {
throw new IllegalArgumentException("invalid dim \"" + dim + "\"; should be \"" + field + "\"");
}
if (path.length != 0) {
throw new IllegalArgumentException("path.length should be 0");
}
LabelAndValue[] labelValues = new LabelAndValue[counts.length];
for(int i=0;i<counts.length;i++) {
labelValues[i] = new LabelAndValue(ranges[i].label, counts[i]);
}
return new FacetResult(dim, path, totCount, labelValues, labelValues.length);
}
@Override
public Number getSpecificValue(String dim, String... path) throws IOException {
// TODO: should we impl this?
throw new UnsupportedOperationException();
}
@Override
public List<FacetResult> getAllDims(int topN) throws IOException {
return Collections.singletonList(getTopChildren(topN, null));
}
}