/*
* Copyright 2003-2017 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.impl.interpreted;
import jetbrains.mps.generator.impl.GeneratorUtil;
import jetbrains.mps.generator.impl.RuleConsequenceProcessor;
import jetbrains.mps.generator.impl.RuleUtil;
import jetbrains.mps.generator.impl.TemplateProcessingFailureException;
import jetbrains.mps.generator.impl.query.QueryKey;
import jetbrains.mps.generator.impl.query.QueryKeyImpl;
import jetbrains.mps.generator.impl.query.QueryProviderBase;
import jetbrains.mps.generator.impl.query.ReductionRuleCondition;
import jetbrains.mps.generator.runtime.GenerationException;
import jetbrains.mps.generator.runtime.ReductionRuleBase;
import jetbrains.mps.generator.runtime.TemplateContext;
import jetbrains.mps.generator.runtime.TemplateReductionRule;
import jetbrains.mps.generator.runtime.TemplateRuleWithCondition;
import jetbrains.mps.generator.template.ReductionRuleQueryContext;
import jetbrains.mps.smodel.SNodePointer;
import jetbrains.mps.smodel.adapter.MetaAdapterByDeclaration;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.mps.openapi.model.SNode;
import java.util.Collection;
public class TemplateReductionRuleInterpreted extends ReductionRuleBase implements TemplateReductionRule, TemplateRuleWithCondition {
private final SNode myRuleNode;
private final String myMappingName;
private final RuleConsequenceProcessor myRuleConsequence;
private ReductionRuleCondition myCondition;
public TemplateReductionRuleInterpreted(SNode ruleNode) {
super(new SNodePointer(ruleNode), MetaAdapterByDeclaration.getConcept(RuleUtil.getBaseRuleApplicableConcept(ruleNode)), RuleUtil.getBaseRuleApplyToConceptInheritors(ruleNode));
myRuleNode = ruleNode;
myMappingName = RuleUtil.getBaseRuleLabel(ruleNode);
final SNode rc = RuleUtil.getReductionRuleConsequence(ruleNode);
myRuleConsequence = rc == null ? null : RuleConsequenceProcessor.prepare(rc);
}
@Override
public boolean isApplicable(@NotNull TemplateContext context) throws GenerationException {
if (myCondition == null) {
SNode condition = RuleUtil.getBaseRuleCondition(myRuleNode);
if (condition != null) {
QueryKey identity = new QueryKeyImpl(getRuleNode(), condition.getNodeId(), myRuleNode);
myCondition = context.getEnvironment().getQueryProvider(getRuleNode()).getReductionRuleCondition(identity);
} else {
myCondition = new QueryProviderBase.Defaults();
}
}
return myCondition.check(new ReductionRuleQueryContext(context, getRuleNode()));
}
@Override
@NotNull
public Collection<SNode> apply(@NotNull TemplateContext context) throws GenerationException {
if (myRuleConsequence == null) {
throw new TemplateProcessingFailureException(myRuleNode, "no rule consequence", GeneratorUtil.describeInput(context));
}
return myRuleConsequence.processRuleConsequence(context.subContext(myMappingName));
}
}