content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.asterix.cloud.lazy.accessor;
  
  import java.io.FilenameFilter;
  import java.util.Collections;
  import java.util.Set;
  
  import org.apache.asterix.cloud.CloudFileHandle;
  import org.apache.asterix.cloud.UncachedFileReference;
  import org.apache.asterix.cloud.bulk.IBulkOperationCallBack;
  import org.apache.asterix.cloud.bulk.NoOpDeleteBulkCallBack;
  import org.apache.asterix.cloud.clients.ICloudClient;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.io.FileReference;
  import org.apache.hyracks.control.nc.io.IOManager;
  
  /**
   * LocalAccessor would be used once everything in the cloud storage is cached locally
   */
  public class LocalAccessor extends AbstractLazyAccessor {
  
      public LocalAccessor(ICloudClient cloudClient, String bucket, IOManager localIoManager) {
          super(cloudClient, bucket, localIoManager);
      }
  
      @Override
      public boolean isLocalAccessor() {
          return true;
      }
  
      @Override
      public IBulkOperationCallBack getBulkOperationCallBack() {
          return NoOpDeleteBulkCallBack.INSTANCE;
      }
  
      @Override
      public void doOnOpen(CloudFileHandle fileHandle) throws HyracksDataException {
          // NoOp
      }
  
      @Override
      public Set<FileReference> doList(FileReference dir, FilenameFilter filter) throws HyracksDataException {
          return localIoManager.list(dir, filter);
      }
  
      @Override
      public boolean doExists(FileReference fileRef) throws HyracksDataException {
          return localIoManager.exists(fileRef);
      }
  
      @Override
      public long doGetSize(FileReference fileReference) throws HyracksDataException {
          return localIoManager.getSize(fileReference);
      }
  
      @Override
      public byte[] doReadAllBytes(FileReference fileReference) throws HyracksDataException {
          return localIoManager.readAllBytes(fileReference);
      }
  
      @Override
      public void doDelete(FileReference fileReference) throws HyracksDataException {
          doCloudDelete(fileReference);
          localIoManager.delete(fileReference);
      }
  
      @Override
      public void doOverwrite(FileReference fileReference, byte[] bytes) throws HyracksDataException {
          cloudClient.write(bucket, fileReference.getRelativePath(), bytes);
          localIoManager.overwrite(fileReference, bytes);
      }
  
      @Override
      public Set<UncachedFileReference> getUncachedFiles() {
          return Collections.emptySet();
      }
  }
  