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package org.apache.solr.search.grouping.distributed.command;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import org.apache.lucene.search.Collector;
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import org.apache.lucene.search.Sort;
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import org.apache.lucene.search.grouping.SearchGroup;
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import org.apache.lucene.search.grouping.TermFirstPassGroupingCollector;
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import org.apache.solr.schema.SchemaField;
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import org.apache.solr.search.grouping.Command;
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import java.io.IOException;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.List;
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public class SearchGroupsFieldCommand implements Command<Collection<SearchGroup<String>>> {
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public static class Builder {
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private SchemaField field;
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private Sort groupSort;
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private Integer topNGroups;
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public Builder setField(SchemaField field) {
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public Builder setGroupSort(Sort groupSort) {
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this.groupSort = groupSort;
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public Builder setTopNGroups(int topNGroups) {
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this.topNGroups = topNGroups;
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public SearchGroupsFieldCommand build() {
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if (field == null || groupSort == null || topNGroups == null) {
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throw new IllegalStateException("All fields must be set");
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return new SearchGroupsFieldCommand(field, groupSort, topNGroups);
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private final SchemaField field;
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private final Sort groupSort;
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private final int topNGroups;
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private TermFirstPassGroupingCollector collector;
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private SearchGroupsFieldCommand(SchemaField field, Sort groupSort, int topNGroups) {
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this.groupSort = groupSort;
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this.topNGroups = topNGroups;
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public List<Collector> create() throws IOException {
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collector = new TermFirstPassGroupingCollector(field.getName(), groupSort, topNGroups);
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return Arrays.asList((Collector) collector);
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public Collection<SearchGroup<String>> result() {
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return collector.getTopGroups(0, true);
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public Sort getSortWithinGroup() {
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public Sort getGroupSort() {
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public String getKey() {
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return field.getName();