/*
* 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.common.accumulators;
import org.apache.flink.annotation.PublicEvolving;
/**
* An accumulator that sums up {@code double} values.
*/
@PublicEvolving
public class DoubleCounter implements SimpleAccumulator<Double> {
private static final long serialVersionUID = 1L;
private double localValue = 0;
public DoubleCounter() {}
public DoubleCounter(double value) {
this.localValue = value;
}
// ------------------------------------------------------------------------
// Accumulator
// ------------------------------------------------------------------------
/**
* Consider using {@link #add(double)} instead for primitive double values
*/
@Override
public void add(Double value) {
localValue += value;
}
@Override
public Double getLocalValue() {
return localValue;
}
@Override
public void merge(Accumulator<Double, Double> other) {
this.localValue += other.getLocalValue();
}
@Override
public void resetLocal() {
this.localValue = 0;
}
@Override
public DoubleCounter clone() {
DoubleCounter result = new DoubleCounter();
result.localValue = localValue;
return result;
}
// ------------------------------------------------------------------------
// Primitive Specializations
// ------------------------------------------------------------------------
public void add(double value){
localValue += value;
}
public double getLocalValuePrimitive() {
return this.localValue;
}
// ------------------------------------------------------------------------
// Utilities
// ------------------------------------------------------------------------
@Override
public String toString() {
return "DoubleCounter " + this.localValue;
}
}