| /* |
| * 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. |
| */ |
| package org.apache.solr.analytics.facet; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.HashMap; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.solr.analytics.facet.compare.FacetResultsComparator; |
| import org.apache.solr.analytics.util.AnalyticsResponseHeadings; |
| import org.apache.solr.common.util.NamedList; |
| |
| import com.google.common.collect.Iterables; |
| |
| /** |
| * A facet that can be sorted by either the facet value or an expression value. |
| */ |
| public abstract class SortableFacet extends AnalyticsFacet { |
| protected FacetSortSpecification sort = null; |
| |
| protected SortableFacet(String name) { |
| super(name); |
| } |
| |
| @Override |
| public NamedList<Object> createOldResponse() { |
| final NamedList<Object> results = new NamedList<>(); |
| // Export each expression in the bucket. |
| for (FacetBucket bucket : getBuckets()) { |
| results.add(bucket.getFacetValue(), new NamedList<>(bucket.getResults())); |
| } |
| return results; |
| } |
| |
| @Override |
| public Iterable<Map<String,Object>> createResponse() { |
| final LinkedList<Map<String,Object>> results = new LinkedList<>(); |
| // Export each expression in the bucket. |
| for (FacetBucket bucket : getBuckets()) { |
| Map<String, Object> bucketMap = new HashMap<>(); |
| bucketMap.put(AnalyticsResponseHeadings.FACET_VALUE, bucket.getFacetValue()); |
| bucketMap.put(AnalyticsResponseHeadings.RESULTS, bucket.getResults()); |
| results.add(bucketMap); |
| } |
| return results; |
| } |
| |
| private Iterable<FacetBucket> getBuckets() { |
| final List<FacetBucket> facetResults = new ArrayList<>(); |
| reductionData.forEach((facetVal, dataCol) -> { |
| collectionManager.setData(dataCol); |
| facetResults.add(new FacetBucket(facetVal,expressionCalculator.getResults())); |
| }); |
| |
| return applyOptions(facetResults); |
| } |
| |
| /** |
| * Apply the sorting options to the given facet results. |
| * |
| * @param facetResults to apply sorting options to |
| * @return the sorted results |
| */ |
| @SuppressWarnings({"unchecked", "rawtypes"}) |
| protected Iterable<FacetBucket> applyOptions(List<FacetBucket> facetResults) { |
| // Sorting the buckets if a sort specification is provided |
| if (sort == null || facetResults.isEmpty()) { |
| return facetResults; |
| } |
| Comparator comp = sort.getComparator(); |
| Collections.sort(facetResults, comp); |
| |
| Iterable<FacetBucket> facetResultsIter = facetResults; |
| // apply the limit |
| if (sort.getLimit() > 0) { |
| if (sort.getOffset() > 0) { |
| facetResultsIter = Iterables.skip(facetResultsIter, sort.getOffset()); |
| } |
| facetResultsIter = Iterables.limit(facetResultsIter, sort.getLimit()); |
| } else if (sort.getLimit() == 0) { |
| return new LinkedList<FacetBucket>(); |
| } |
| return facetResultsIter; |
| } |
| |
| /** |
| * Specifies how to sort the buckets of a sortable facet. |
| */ |
| public static class FacetSortSpecification { |
| private FacetResultsComparator comparator; |
| protected int limit; |
| protected int offset; |
| |
| public FacetSortSpecification(FacetResultsComparator comparator, int limit, int offset) { |
| this.comparator = comparator; |
| this.limit = limit; |
| this.offset = offset; |
| } |
| |
| public FacetResultsComparator getComparator() { |
| return comparator; |
| } |
| |
| /** |
| * Get the maximum number of buckets to be returned. |
| * |
| * @return the limit |
| */ |
| public int getLimit() { |
| return limit; |
| } |
| /** |
| * Set the maximum number of buckets to be returned. |
| * |
| * @param limit the maximum number of buckets |
| */ |
| public void setLimit(int limit) { |
| this.limit = limit; |
| } |
| |
| /** |
| * Get the first bucket to return, has to be used with the {@code limit} option. |
| * |
| * @return the bucket offset |
| */ |
| public int getOffset() { |
| return offset; |
| } |
| } |
| |
| public SortableFacet.FacetSortSpecification getSort() { |
| return sort; |
| } |
| |
| public void setSort(SortableFacet.FacetSortSpecification sort) { |
| this.sort = sort; |
| } |
| |
| public static class FacetBucket { |
| private final String facetValue; |
| private final Map<String,Object> expressionResults; |
| |
| public FacetBucket(String facetValue, Map<String,Object> expressionResults) { |
| this.facetValue = facetValue; |
| this.expressionResults = expressionResults; |
| } |
| |
| public Object getResult(String expression) { |
| return expressionResults.get(expression); |
| } |
| |
| public Map<String,Object> getResults() { |
| return expressionResults; |
| } |
| |
| public String getFacetValue() { |
| return facetValue; |
| } |
| } |
| } |