| /* |
| * 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.aggregation; |
| |
| import com.fasterxml.jackson.annotation.JsonCreator; |
| import com.fasterxml.jackson.annotation.JsonProperty; |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.ImmutableList; |
| import org.apache.druid.segment.ColumnInspector; |
| import org.apache.druid.segment.ColumnSelectorFactory; |
| import org.apache.druid.segment.column.ValueType; |
| import org.apache.druid.segment.vector.VectorColumnSelectorFactory; |
| |
| import javax.annotation.Nullable; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| |
| /** |
| */ |
| public class CountAggregatorFactory extends AggregatorFactory |
| { |
| private final String name; |
| |
| @JsonCreator |
| public CountAggregatorFactory( |
| @JsonProperty("name") String name |
| ) |
| { |
| Preconditions.checkNotNull(name, "Must have a valid, non-null aggregator name"); |
| |
| this.name = name; |
| } |
| |
| @Override |
| public Aggregator factorize(ColumnSelectorFactory metricFactory) |
| { |
| return new CountAggregator(); |
| } |
| |
| @Override |
| public BufferAggregator factorizeBuffered(ColumnSelectorFactory metricFactory) |
| { |
| return new CountBufferAggregator(); |
| } |
| |
| @Override |
| public VectorAggregator factorizeVector(final VectorColumnSelectorFactory selectorFactory) |
| { |
| return new CountVectorAggregator(); |
| } |
| |
| @Override |
| public Comparator getComparator() |
| { |
| return CountAggregator.COMPARATOR; |
| } |
| |
| @Override |
| public boolean canVectorize(ColumnInspector columnInspector) |
| { |
| return true; |
| } |
| |
| @Override |
| public Object combine(Object lhs, Object rhs) |
| { |
| return CountAggregator.combineValues(lhs, rhs); |
| } |
| |
| @Override |
| public AggregateCombiner makeAggregateCombiner() |
| { |
| return new LongSumAggregateCombiner(); |
| } |
| |
| @Override |
| public AggregatorFactory getCombiningFactory() |
| { |
| return new LongSumAggregatorFactory(name, name); |
| } |
| |
| @Override |
| public List<AggregatorFactory> getRequiredColumns() |
| { |
| return Collections.singletonList(new CountAggregatorFactory(name)); |
| } |
| |
| @Override |
| public Object deserialize(Object object) |
| { |
| return object; |
| } |
| |
| @Nullable |
| @Override |
| public Object finalizeComputation(@Nullable Object object) |
| { |
| return object; |
| } |
| |
| @Override |
| @JsonProperty |
| public String getName() |
| { |
| return name; |
| } |
| |
| @Override |
| public List<String> requiredFields() |
| { |
| return ImmutableList.of(); |
| } |
| |
| @Override |
| public byte[] getCacheKey() |
| { |
| return new byte[]{AggregatorUtil.COUNT_CACHE_TYPE_ID}; |
| } |
| |
| @Override |
| public ValueType getType() |
| { |
| return ValueType.LONG; |
| } |
| |
| @Override |
| public ValueType getFinalizedType() |
| { |
| return ValueType.LONG; |
| } |
| |
| @Override |
| public int getMaxIntermediateSize() |
| { |
| return Long.BYTES; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "CountAggregatorFactory{" + |
| "name='" + name + '\'' + |
| '}'; |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| |
| CountAggregatorFactory that = (CountAggregatorFactory) o; |
| |
| if (name != null ? !name.equals(that.name) : that.name != null) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return name != null ? name.hashCode() : 0; |
| } |
| } |