io.druid.java.util.common.collect.AggregatingMap Maven / Gradle / Ivy
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* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.java.util.common.collect;
import java.util.HashMap;
// Can't find a good way to abstract over which aggregator representation is used,
// so I just pick Double/MutableDouble.
public class AggregatingMap extends HashMap
{
public void add(K k, double n)
{
final Double value = get(k);
if (value == null) {
put(k, n);
return;
}
put(k, value + n);
}
}