/*
* 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.DefaultTemplateContext;
import jetbrains.mps.generator.impl.GenerationFailureException;
import jetbrains.mps.generator.impl.GeneratorUtil;
import jetbrains.mps.generator.impl.RuleUtil;
import jetbrains.mps.generator.impl.query.MapRootRuleCondition;
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.runtime.GenerationException;
import jetbrains.mps.generator.runtime.MapRootRuleBase;
import jetbrains.mps.generator.runtime.TemplateContext;
import jetbrains.mps.generator.runtime.TemplateExecutionEnvironment;
import jetbrains.mps.generator.runtime.TemplateRootMappingRule;
import jetbrains.mps.generator.template.MapRootRuleContext;
import jetbrains.mps.smodel.adapter.MetaAdapterByDeclaration;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.mps.openapi.model.SNode;
import java.util.Collection;
/**
* Evgeny Gryaznov, Nov 30, 2010
*/
public final class TemplateRootMappingRuleInterpreted extends MapRootRuleBase implements TemplateRootMappingRule {
private final SNode myRuleNode;
private final String myMappingName;
private final SNode myTemplateNode;
private MapRootRuleCondition myCondition;
public TemplateRootMappingRuleInterpreted(SNode rule) {
super(rule.getReference(), MetaAdapterByDeclaration.getConcept(RuleUtil.getBaseRuleApplicableConcept(rule)),
RuleUtil.getBaseRuleApplyToConceptInheritors(rule), RuleUtil.getRootRuleKeepSourceRoot(rule));
myRuleNode = rule;
myMappingName = RuleUtil.getBaseRuleLabel(rule);
myTemplateNode = RuleUtil.getRootRuleTemplateNode(rule);
}
@Override
public boolean isApplicable(@NotNull TemplateContext context) throws GenerationFailureException {
if (myCondition == null) {
SNode condition = RuleUtil.getBaseRuleCondition(myRuleNode);
if (condition != null) {
QueryKey identity = new QueryKeyImpl(getRuleNode(), condition.getNodeId(), myRuleNode);
myCondition = context.getEnvironment().getQueryProvider(getRuleNode()).getMapRootRuleCondition(identity);
} else {
myCondition = new QueryProviderBase.Defaults();
}
}
return myCondition.check(new MapRootRuleContext(context, getRuleNode()));
}
@Nullable
@Override
public Collection<SNode> apply(@NotNull TemplateContext context) throws GenerationException {
if (myTemplateNode != null) {
// subContext(null) doesn't update mapping label, while we'd like to reset it for the rule.
// It's possible to do it another way: context = myMappingName == null ? context.subContext() : context.subContext(myMappingName);
// but it seems better to start rule with a fresh context anyway (unless we'd need to pass parameters - which would be odd as users
// have no control on which rules get applied and hence can't expect parameters present)
return context.getEnvironment().getTemplateProcessor().apply(myTemplateNode, new DefaultTemplateContext(context.getEnvironment(), context.getInput(), myMappingName));
} else {
context.getEnvironment().getLogger().error(getRuleNode(), "no template is defined for the rule", GeneratorUtil.describeIfExists(context.getInput(), "input node"));
}
return null;
}
}