/*
* Copyright 2003-2011 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.model.GeneratableSModel;
import jetbrains.mps.extapi.persistence.FileDataSource;
import jetbrains.mps.vfs.IFile;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.mps.openapi.persistence.StreamDataSource;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
public class ModelDigestHelper {
private static ModelDigestHelper ourInstance = new ModelDigestHelper();
private List<DigestProvider> myProviders = new CopyOnWriteArrayList<DigestProvider>();
public static ModelDigestHelper getInstance() {
return ourInstance;
}
private ModelDigestHelper() {
}
public void addDigestProvider(DigestProvider provider) {
myProviders.add(provider);
}
public Map<String, String> getGenerationHashes(@NotNull StreamDataSource source) {
if (!(source instanceof FileDataSource)) return null;
return getGenerationHashes(((FileDataSource) source).getFile());
}
public Map<String, String> getGenerationHashes(@NotNull IFile file) {
for (DigestProvider p : myProviders) {
Map<String, String> result = p.getGenerationHashes(file);
if (result != null) return result;
}
return null;
}
public String getModelHash(@NotNull StreamDataSource source) {
if (source instanceof FileDataSource) {
for (DigestProvider p : myProviders) {
Map<String, String> result = p.getGenerationHashes(((FileDataSource) source).getFile());
if (result != null) {
return result.get(GeneratableSModel.FILE);
}
}
}
return null;
}
public interface DigestProvider {
Map<String, String> getGenerationHashes(@NotNull IFile iFile);
}
}