| 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.queries.function.valuesource.LongFieldSource; |
| |
| /** 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; |
| |
| /** Our field name. */ |
| protected final String field; |
| |
| /** Total number of hits. */ |
| protected int totCount; |
| |
| /** Create {@code RangeFacetCounts}, using {@link |
| * LongFieldSource} from the specified field. */ |
| protected RangeFacetCounts(String field, Range[] ranges) throws IOException { |
| this.field = field; |
| this.ranges = ranges; |
| 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)); |
| } |
| } |