/* * Copyright 2014 Red Hat, Inc. and/or its affiliates. * * Licensed 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.dashbuilder.dataset.group; import java.util.Collection; /** * Manager class that it keeps a registry of AggregateFunction instances. */ public interface AggregateFunctionManager { /** * Get all the aggregate functions registered. */ Collection<AggregateFunction> getAllFunctions(); /** * Get an aggregate function by its type. */ AggregateFunction getFunctionByType(AggregateFunctionType type); /** * Register an aggregate function. */ void registerFunction(AggregateFunction function); }