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/*******************************************************************************
* Copyright (c) 2010-2016, Zoltan Ujhelyi, Tamas Szabo, Istvan Rath and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.matchers.psystem.aggregations;
/**
*
* Describes an aggregation operator keyword, potentially with type polymorphism. The actual runtime
* {@link IMultisetAggregationOperator} that implements the aggregation logic may depend on the type context.
*
* <p>
* Implementors are suggested to use lower-case classnames (as it will end up in the language) and are required use the
* annotation {@link AggregatorType} to indicate type inference rules.
*
* <p>
* <strong>Important!</strong> Implemented aggregators must be (1) deterministic (2) pure and (3)support incremental
* value updates in the internal operation.
*
* @author Zoltan Ujhelyi
* @since 1.4
*/
public interface IAggregatorFactory {
/**
* Given type parameters selected from {@link AggregatorType} annotations, returns a run-time aggregator operator
* that is bound to the actual types.
*
* @param domainClass
* Java type of the values that are being aggregated
* @return the actual run-time aggregator logic, with type bindings
*/
public BoundAggregator getAggregatorLogic(Class<?> domainClass);
}
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