/*
* 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.persistence;
import jetbrains.mps.extapi.persistence.FileBasedModelRoot;
import jetbrains.mps.extapi.persistence.ModelFactoryService;
import jetbrains.mps.extapi.persistence.SourceRoot;
import jetbrains.mps.persistence.DataSourceFactoryBridge.CompositeResult;
import jetbrains.mps.vfs.FileSystem;
import jetbrains.mps.vfs.IFile;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.mps.openapi.persistence.DataSource;
import org.jetbrains.mps.openapi.persistence.ModelFactory;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* Walks recursively default model roots (alongside the filesystem tree)
*
* Created by apyshkin on 12/14/16.
*/
final class ModelSourceRootWalker {
private static final Logger LOG = LogManager.getLogger(ModelSourceRootWalker.class);
private final FileTreeWalkListener myCallback;
@NotNull private final DefaultModelRoot myModelRoot;
public ModelSourceRootWalker(@NotNull DefaultModelRoot modelRoot, @NotNull ModelRootWalkListener callback) {
myModelRoot = modelRoot;
myCallback = new ModelRootTreeWalkCallback(modelRoot, callback);
}
public void traverse(@NotNull SourceRoot sourceRoot) {
IFile root = sourceRoot.getAbsolutePath();
if (!root.exists()) {
LOG.warn("Source root '" + sourceRoot + "' does not exist, cannot traverse!");
return;
}
if (!root.isDirectory()) {
LOG.warn("Source root '" + sourceRoot + "' is not a directory, cannot traverse!");
return;
}
walk(new ModelRootFileTreeLocus(sourceRoot));
}
private void walk(@NotNull ModelRootFileTreeLocus state) {
IFile curFile = state.getFile();
assert curFile.isDirectory();
assert curFile.exists();
if (!isFileIgnored(curFile)) {
myCallback.onDirectoryVisited(state);
List<IFile> children = curFile.getChildren();
assert children != null;
for (IFile child : children) {
ModelRootFileTreeLocus nextState = state.nextState(child);
if (!child.isDirectory()) {
myCallback.onFileVisited(nextState);
} else {
walk(nextState);
}
}
}
}
private boolean isFileIgnored(IFile curDirectory) {
return ((FileSystem) myModelRoot.getFileSystem()).isFileIgnored(curDirectory.getName());
}
private final static class ModelRootTreeWalkCallback implements FileTreeWalkListener {
private final ModelRootWalkListener myCallback;
private final FileBasedModelRoot myModelRoot;
private final DataSourceFactoryBridge myDataSourceFactoryBridge;
private final Set<DataSource> myVisitedDataSources = new HashSet<>();
public ModelRootTreeWalkCallback(@NotNull FileBasedModelRoot modelRoot, @NotNull ModelRootWalkListener callback) {
myCallback = callback;
myModelRoot = modelRoot;
myDataSourceFactoryBridge = new DataSourceFactoryBridge(myModelRoot);
}
@Override
public void onFileVisited(@NotNull ModelRootFileTreeLocus state) {
IFile file = state.getFile();
assert !file.isDirectory() : "a regular file is promised";
CompositeResult<DataSource> result = myDataSourceFactoryBridge.create(file);
if (result != null) {
DataSource dataSource = result.getDataSource();
if (dataSource.getType() == null) {
return;
}
if (!isVisited(dataSource)) {
List<ModelFactory> candidates = ModelFactoryService.getInstance().getModelFactories(dataSource.getType());
for (ModelFactory modelFactory : candidates) {
if (modelFactory.supports(dataSource)) {
markVisited(dataSource);
myCallback.onDataSourceVisited(modelFactory, dataSource, result.getOptions(), file);
return;
}
}
if (!candidates.isEmpty()) { // means we are familiar with the file format but unable to load it
LOG.error("Could not discover an appropriate model factory associated with the '" + dataSource.getType() + "'");
}
}
}
}
private void markVisited(@NotNull DataSource dataSource) {
myVisitedDataSources.add(dataSource);
}
private boolean isVisited(@NotNull DataSource dataSource) {
return myVisitedDataSources.contains(dataSource);
}
@Override
public void onDirectoryVisited(@NotNull ModelRootFileTreeLocus state) {
}
}
}