/*
* 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.impl;
import jetbrains.mps.generator.impl.ModelStreamManager.Provider;
import jetbrains.mps.util.IterableUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.mps.openapi.model.SModel;
import org.jetbrains.mps.openapi.model.SModelReference;
import org.jetbrains.mps.openapi.persistence.ModelFactory;
import org.jetbrains.mps.openapi.persistence.PersistenceFacade;
import java.io.IOException;
import java.util.Collections;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* Tracks models with exports during whole generation session (spans all models during single generation run/make).
* @author Artem Tikhomirov
*/
public class ExportsVault {
private final Provider myStreamProvider;
private final ConcurrentMap<SModelReference, SModel> myExportModels;
public ExportsVault(ModelStreamManager.Provider streamProvider) {
myStreamProvider = streamProvider;
myExportModels = new ConcurrentHashMap<SModelReference, SModel>();
}
/**
* Create new blank exports model, regardless of presence of any existing one.
*/
@NotNull
public SModel newExportsModel(@NotNull SModel inputModel) {
return cachedExports(inputModel, true);
}
/**
* Find existing exports for the given model, if any.
*/
@Nullable
public SModel getExportsModel(@NotNull SModel inputModel) {
return cachedExports(inputModel, false);
}
private SModel cachedExports(SModel inputModel, boolean createNew) {
final SModelReference inputModelReference = inputModel.getReference();
SModel exportsModel = myExportModels.get(inputModelReference);
if (exportsModel == null) {
final ModelFactory modelFactory = PersistenceFacade.getInstance().getDefaultModelFactory();
ModelStreamManager streamManager = myStreamProvider.getStreamManager(inputModel);
final String modelFileName = "exports";
final SingleStreamSource source = new SingleStreamSource(streamManager.getOutputLocation(), modelFileName);
try {
if (createNew) {
exportsModel = modelFactory.create(source, Collections.singletonMap(ModelFactory.OPTION_MODELNAME, inputModel.getModelName()));
} else if (IterableUtil.asSet(streamManager.getOutputLocation().getAvailableStreams()).contains(modelFileName)) {
// try to load
exportsModel = modelFactory.load(source, Collections.<String, String>emptyMap());
}
} catch (IOException ex) {
// FIXME need better handling. Rather create model outside?
throw new IllegalStateException("Could not create model to keep cross-model exports", ex);
}
if (exportsModel != null) {
myExportModels.putIfAbsent(inputModelReference, exportsModel);
exportsModel = myExportModels.get(inputModelReference);
}
}
return exportsModel;
}
}