| /* |
| * 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.rya.api.function.aggregation; |
| |
| import org.apache.rya.api.model.VisibilityBindingSet; |
| |
| import edu.umd.cs.findbugs.annotations.DefaultAnnotation; |
| import edu.umd.cs.findbugs.annotations.NonNull; |
| |
| /** |
| * A function that updates an {@link AggregationState}. |
| */ |
| @DefaultAnnotation(NonNull.class) |
| public interface AggregationFunction { |
| |
| /** |
| * Updates an {@link AggregationState} based on the values of a child Binding Set. |
| * |
| * @param aggregation - Defines which function needs to be performed as well as any details required |
| * to do the aggregation work. (not null) |
| * @param state - The state that will be updated. (not null) |
| * @param childBindingSet - The Binding Set whose values will be used to update the state. |
| */ |
| public void update(AggregationElement aggregation, AggregationState state, VisibilityBindingSet childBindingSet); |
| } |