MPSLanguagesVirtualFileSystem.java

/*
 * 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.workbench.languagesFs;

import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.components.ApplicationComponent;
import com.intellij.openapi.vfs.DeprecatedVirtualFileSystem;
import com.intellij.openapi.vfs.VirtualFile;
import jetbrains.mps.smodel.Language;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.mps.openapi.module.SModuleReference;
import org.jetbrains.mps.openapi.persistence.PersistenceFacade;

import java.io.IOException;
import java.util.WeakHashMap;

public class MPSLanguagesVirtualFileSystem extends DeprecatedVirtualFileSystem implements ApplicationComponent {

  public static MPSLanguagesVirtualFileSystem getInstance() {
    return ApplicationManager.getApplication().getComponent(MPSLanguagesVirtualFileSystem.class);
  }

  private WeakHashMap<SModuleReference, MPSLanguageVirtualFile> myVirtualFiles = new WeakHashMap<>();

  public MPSLanguageVirtualFile getFileFor(@NotNull final Language language) {
    return getFileFor(language.getModuleReference());
  }

  public MPSLanguageVirtualFile getFileFor(@NotNull final SModuleReference language) {
    MPSLanguageVirtualFile vf = myVirtualFiles.get(language);
    if (vf != null) {
      return vf;
    }
    myVirtualFiles.put(language, vf = new MPSLanguageVirtualFile(language));
    return vf;
  }

  @Override
  @NonNls
  @NotNull
  public String getComponentName() {
    return "MPS Languages File System";
  }

  @Override
  public void initComponent() {
  }

  @Override
  public void disposeComponent() {
  }

  @Override
  @NonNls
  public String getProtocol() {
    return "mpslang";
  }

  @Override
  @Nullable
  public VirtualFile findFileByPath(final @NotNull @NonNls String path) {
    return getFileFor(PersistenceFacade.getInstance().createModuleReference(path));
  }

  @Override
  public void refresh(boolean asynchronous) {
  }

  @Override
  @Nullable
  public VirtualFile refreshAndFindFileByPath(String path) {
    return null;
  }

  @Override
  protected void deleteFile(Object requestor, VirtualFile vFile) throws IOException {
    throw new UnsupportedOperationException();
  }

  @Override
  protected void moveFile(Object requestor, VirtualFile vFile, VirtualFile newParent) throws IOException {
    throw new UnsupportedOperationException();
  }

  @Override
  protected void renameFile(Object requestor, VirtualFile vFile, String newName) throws IOException {
    throw new UnsupportedOperationException();
  }

  @Override
  public VirtualFile createChildFile(Object requestor, VirtualFile vDir, String fileName) throws IOException {
    throw new UnsupportedOperationException();
  }

  @Override
  public VirtualFile createChildDirectory(Object requestor, VirtualFile vDir, String dirName) throws IOException {
    throw new UnsupportedOperationException();
  }

  @Override
  public VirtualFile copyFile(Object requestor, VirtualFile virtualFile, VirtualFile newParent, String copyName) throws IOException {
    throw new UnsupportedOperationException();
  }
}