package org.apache.solr.search.grouping.distributed.command;
/*
* 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 org.apache.lucene.search.Collector;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.grouping.SearchGroup;
import org.apache.lucene.search.grouping.TermFirstPassGroupingCollector;
import org.apache.solr.schema.SchemaField;
import org.apache.solr.search.grouping.Command;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
/**
*
*/
public class SearchGroupsFieldCommand implements Command<Collection<SearchGroup<String>>> {
public static class Builder {
private SchemaField field;
private Sort groupSort;
private Integer topNGroups;
public Builder setField(SchemaField field) {
this.field = field;
return this;
}
public Builder setGroupSort(Sort groupSort) {
this.groupSort = groupSort;
return this;
}
public Builder setTopNGroups(int topNGroups) {
this.topNGroups = topNGroups;
return this;
}
public SearchGroupsFieldCommand build() {
if (field == null || groupSort == null || topNGroups == null) {
throw new IllegalStateException("All fields must be set");
}
return new SearchGroupsFieldCommand(field, groupSort, topNGroups);
}
}
private final SchemaField field;
private final Sort groupSort;
private final int topNGroups;
private TermFirstPassGroupingCollector collector;
private SearchGroupsFieldCommand(SchemaField field, Sort groupSort, int topNGroups) {
this.field = field;
this.groupSort = groupSort;
this.topNGroups = topNGroups;
}
public List<Collector> create() throws IOException {
collector = new TermFirstPassGroupingCollector(field.getName(), groupSort, topNGroups);
return Arrays.asList((Collector) collector);
}
public Collection<SearchGroup<String>> result() {
return collector.getTopGroups(0, true);
}
public Sort getSortWithinGroup() {
return null;
}
public Sort getGroupSort() {
return groupSort;
}
public String getKey() {
return field.getName();
}
}