org.apache.flink.api.java.aggregation.SumAggregationFunction Maven / Gradle / Ivy
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* 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.flink.api.java.aggregation;
import org.apache.flink.annotation.Internal;
import org.apache.flink.types.ByteValue;
import org.apache.flink.types.DoubleValue;
import org.apache.flink.types.FloatValue;
import org.apache.flink.types.IntValue;
import org.apache.flink.types.LongValue;
import org.apache.flink.types.ShortValue;
/**
* Definitions of sum functions for different numerical types.
* @param type of elements being summed
*/
@Internal
public abstract class SumAggregationFunction extends AggregationFunction {
private static final long serialVersionUID = 1L;
@Override
public String toString() {
return "SUM";
}
// --------------------------------------------------------------------------------------------
private static final class ByteSumAgg extends SumAggregationFunction {
private static final long serialVersionUID = 1L;
private long agg;
@Override
public void initializeAggregate() {
agg = 0;
}
@Override
public void aggregate(Byte value) {
agg += value;
}
@Override
public Byte getAggregate() {
return (byte) agg;
}
}
private static final class ByteValueSumAgg extends SumAggregationFunction {
private static final long serialVersionUID = 1L;
private long agg;
@Override
public void initializeAggregate() {
agg = 0;
}
@Override
public void aggregate(ByteValue value) {
agg += value.getValue();
}
@Override
public ByteValue getAggregate() {
return new ByteValue((byte) agg);
}
}
private static final class ShortSumAgg extends SumAggregationFunction {
private static final long serialVersionUID = 1L;
private long agg;
@Override
public void initializeAggregate() {
agg = 0;
}
@Override
public void aggregate(Short value) {
agg += value;
}
@Override
public Short getAggregate() {
return (short) agg;
}
}
private static final class ShortValueSumAgg extends SumAggregationFunction {
private static final long serialVersionUID = 1L;
private long agg;
@Override
public void initializeAggregate() {
agg = 0;
}
@Override
public void aggregate(ShortValue value) {
agg += value.getValue();
}
@Override
public ShortValue getAggregate() {
return new ShortValue((short) agg);
}
}
private static final class IntSumAgg extends SumAggregationFunction {
private static final long serialVersionUID = 1L;
private long agg;
@Override
public void initializeAggregate() {
agg = 0;
}
@Override
public void aggregate(Integer value) {
agg += value;
}
@Override
public Integer getAggregate() {
return (int) agg;
}
}
private static final class IntValueSumAgg extends SumAggregationFunction {
private static final long serialVersionUID = 1L;
private long agg;
@Override
public void initializeAggregate() {
agg = 0;
}
@Override
public void aggregate(IntValue value) {
agg += value.getValue();
}
@Override
public IntValue getAggregate() {
return new IntValue((int) agg);
}
}
private static final class LongSumAgg extends SumAggregationFunction {
private static final long serialVersionUID = 1L;
private long agg;
@Override
public void initializeAggregate() {
agg = 0L;
}
@Override
public void aggregate(Long value) {
agg += value;
}
@Override
public Long getAggregate() {
return agg;
}
}
private static final class LongValueSumAgg extends SumAggregationFunction {
private static final long serialVersionUID = 1L;
private long agg;
@Override
public void initializeAggregate() {
agg = 0L;
}
@Override
public void aggregate(LongValue value) {
agg += value.getValue();
}
@Override
public LongValue getAggregate() {
return new LongValue(agg);
}
}
private static final class FloatSumAgg extends SumAggregationFunction {
private static final long serialVersionUID = 1L;
private double agg;
@Override
public void initializeAggregate() {
agg = 0.0f;
}
@Override
public void aggregate(Float value) {
agg += value;
}
@Override
public Float getAggregate() {
return (float) agg;
}
}
private static final class FloatValueSumAgg extends SumAggregationFunction {
private static final long serialVersionUID = 1L;
private double agg;
@Override
public void initializeAggregate() {
agg = 0.0f;
}
@Override
public void aggregate(FloatValue value) {
agg += value.getValue();
}
@Override
public FloatValue getAggregate() {
return new FloatValue((float) agg);
}
}
private static final class DoubleSumAgg extends SumAggregationFunction {
private static final long serialVersionUID = 1L;
private double agg;
@Override
public void initializeAggregate() {
agg = 0.0;
}
@Override
public void aggregate(Double value) {
agg += value;
}
@Override
public Double getAggregate() {
return agg;
}
}
private static final class DoubleValueSumAgg extends SumAggregationFunction {
private static final long serialVersionUID = 1L;
private double agg;
@Override
public void initializeAggregate() {
agg = 0.0;
}
@Override
public void aggregate(DoubleValue value) {
agg += value.getValue();
}
@Override
public DoubleValue getAggregate() {
return new DoubleValue(agg);
}
}
// --------------------------------------------------------------------------------------------
/**
* Factory for {@link SumAggregationFunction}.
*/
public static final class SumAggregationFunctionFactory implements AggregationFunctionFactory {
private static final long serialVersionUID = 1L;
@SuppressWarnings("unchecked")
@Override
public AggregationFunction createAggregationFunction(Class type) {
if (type == Long.class) {
return (AggregationFunction) new LongSumAgg();
}
else if (type == LongValue.class) {
return (AggregationFunction) new LongValueSumAgg();
}
else if (type == Integer.class) {
return (AggregationFunction) new IntSumAgg();
}
else if (type == IntValue.class) {
return (AggregationFunction) new IntValueSumAgg();
}
else if (type == Double.class) {
return (AggregationFunction) new DoubleSumAgg();
}
else if (type == DoubleValue.class) {
return (AggregationFunction) new DoubleValueSumAgg();
}
else if (type == Float.class) {
return (AggregationFunction) new FloatSumAgg();
}
else if (type == FloatValue.class) {
return (AggregationFunction) new FloatValueSumAgg();
}
else if (type == Byte.class) {
return (AggregationFunction) new ByteSumAgg();
}
else if (type == ByteValue.class) {
return (AggregationFunction) new ByteValueSumAgg();
}
else if (type == Short.class) {
return (AggregationFunction) new ShortSumAgg();
}
else if (type == ShortValue.class) {
return (AggregationFunction) new ShortValueSumAgg();
}
else {
throw new UnsupportedAggregationTypeException("The type " + type.getName() +
" is currently not supported for built-in sum aggregations.");
}
}
}
}