/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership. Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/
package io.crate.operation.aggregation.impl;
import com.google.common.annotations.VisibleForTesting;
import io.crate.breaker.RamAccountingContext;
import io.crate.data.Input;
import io.crate.metadata.FunctionIdent;
import io.crate.metadata.FunctionInfo;
import io.crate.operation.aggregation.AggregationFunction;
import io.crate.types.DataType;
import io.crate.types.DataTypes;
import org.elasticsearch.common.breaker.CircuitBreakingException;
import java.util.Collections;
public class SumAggregation extends AggregationFunction<Double, Double> {
public static final String NAME = "sum";
private final FunctionInfo info;
public static void register(AggregationImplModule mod) {
for (DataType t : DataTypes.NUMERIC_PRIMITIVE_TYPES) {
mod.register(new SumAggregation(t));
}
}
@VisibleForTesting
public SumAggregation(DataType inputType) {
this.info = new FunctionInfo(
new FunctionIdent(NAME, Collections.singletonList(inputType)),
DataTypes.DOUBLE,
FunctionInfo.Type.AGGREGATE
);
}
@Override
public Double iterate(RamAccountingContext ramAccountingContext, Double state, Input... args) throws CircuitBreakingException {
return reduce(ramAccountingContext, state, DataTypes.DOUBLE.value(args[0].value()));
}
@Override
public Double reduce(RamAccountingContext ramAccountingContext, Double state1, Double state2) {
if (state1 == null) {
return state2;
}
if (state2 == null) {
return state1;
}
return state1 + state2;
}
@Override
public Double terminatePartial(RamAccountingContext ramAccountingContext, Double state) {
return state;
}
@Override
public Double newState(RamAccountingContext ramAccountingContext) {
ramAccountingContext.addBytes(DataTypes.DOUBLE.fixedSize());
return null;
}
@Override
public DataType partialType() {
return info.returnType();
}
@Override
public FunctionInfo info() {
return info;
}
}