/*
* Copyright 2003-2016 JetBrains s.r.o.
*
* 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 jetbrains.mps.generator.runtime;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.mps.openapi.model.SNode;
import java.util.Collection;
/**
* XXX why this rule doesn't extend TemplateRuleWithCondition?
* Evgeny Gryaznov, 10/27/10
*/
public interface TemplateReductionRule extends TemplateRuleForConcept {
/**
* Try to apply rule in the given context
* @param context execution context
* @return <code>null</code> to indicate this rule could not do anything to active input node
* @throws GenerationException failure/cancellation/control flow. Both {@link jetbrains.mps.generator.impl.DismissTopMappingRuleException} and
* {@link jetbrains.mps.generator.impl.AbandonRuleInputException} exceptions are honoured.
*/
@Nullable
Collection<SNode> apply(@NotNull TemplateContext context) throws GenerationException;
}