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/*******************************************************************************
* Copyright (c) 2010-2016, Zoltan Ujhelyi, IncQuery Labs Ltd.
* 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;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import tools.refinery.viatra.runtime.matchers.aggregators.count;
/**
* The aggregator type annotation describes the type constraints for the selected aggregator. In version 1.4, two kinds of
* aggregators are supported:
*
* <ol>
* <li>An aggregator that does not consider any parameter value from the call ({@link count}), just calculates the
* number of matches. This is represented by a single {@link Void} and a single corresponding return type.</li>
* <li>An aggregator that considers a single parameter from the call, and executes some aggregate operations over it.
* Such an aggregate operation can be defined over multiple types, where each possible parameter type has a corresponding return type declared.</li>
* </ol>
*
* <strong>Important!</strong> The parameterTypes and returnTypes arrays must have
* <ul>
* <li>The same number of classes defined each.</li>
* <li>Items are corresponded by index.</li>
* <li>Items should represent data types</li>
* </ul>
*
* @author Zoltan Ujhelyi
* @since 1.4
*
*/
@Target({ ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Inherited
public @interface AggregatorType {
Class<?>[] parameterTypes();
Class<?>[] returnTypes();
}
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