| /* |
| * 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.druid.query.topn; |
| |
| import org.apache.druid.query.ColumnSelectorPlus; |
| import org.apache.druid.query.topn.types.TopNColumnAggregatesProcessor; |
| import org.apache.druid.segment.Cursor; |
| import org.apache.druid.segment.DimensionSelector; |
| |
| /** |
| */ |
| public class TopNParams |
| { |
| public static final int CARDINALITY_UNKNOWN = -1; |
| private final Cursor cursor; |
| private final int cardinality; |
| private final int numValuesPerPass; |
| private final ColumnSelectorPlus<TopNColumnAggregatesProcessor> selectorPlus; |
| |
| protected TopNParams( |
| ColumnSelectorPlus<TopNColumnAggregatesProcessor> selectorPlus, |
| Cursor cursor, |
| int numValuesPerPass |
| ) |
| { |
| this.selectorPlus = selectorPlus; |
| this.cursor = cursor; |
| this.cardinality = selectorPlus.getColumnSelectorStrategy().getCardinality(selectorPlus.getSelector()); |
| this.numValuesPerPass = numValuesPerPass; |
| } |
| |
| // Only used by TopN algorithms that support String exclusively |
| // Otherwise, get an appropriately typed selector from getSelectorPlus() |
| public DimensionSelector getDimSelector() |
| { |
| return (DimensionSelector) selectorPlus.getSelector(); |
| } |
| |
| public ColumnSelectorPlus<TopNColumnAggregatesProcessor> getSelectorPlus() |
| { |
| return selectorPlus; |
| } |
| |
| public Cursor getCursor() |
| { |
| return cursor; |
| } |
| |
| public int getCardinality() |
| { |
| return cardinality; |
| } |
| |
| public int getNumValuesPerPass() |
| { |
| return numValuesPerPass; |
| } |
| } |