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.camel.component.file.consumer.adapters;
  
  import java.io.File;
  
  import org.apache.camel.component.file.GenericFile;
  import org.apache.camel.component.file.consumer.FileOffsetResumeAdapter;
  import org.apache.camel.component.file.consumer.FileResumeAdapter;
  import org.apache.camel.resume.Offset;
  import org.apache.camel.util.ObjectHelper;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * An implementation of the {@link FileResumeAdapter} that can be used for resume operations for the file component.
   * This can be used to manage the resume operations for a single file using its offset.
   */
  class DefaultFileOffsetResumeAdapter extends AbstractFileResumeAdapter implements FileOffsetResumeAdapter {
      private static final Logger LOG = LoggerFactory.getLogger(DefaultFileOffsetResumeAdapter.class);
  
      private GenericFile<File> genericFile;
  
      private Offset<?> getLastOffset(File addressable) {
          return cache.get(addressable, Offset.class);
      }
  
      @Override
      public void setResumePayload(GenericFile<File> genericFile) {
          this.genericFile = ObjectHelper.notNull(genericFile, "genericFile");
      }
  
      public boolean add(Object key, Object offset) {
          if (offset instanceof Long longOffset) {
              FileOffset fileOffset = (FileOffset) cache.computeIfAbsent((File) key, k -> new FileOffset());
  
              fileOffset.update(longOffset);
          } else {
              throw new UnsupportedOperationException("This adapter cannot be used for directory entries");
          }
  
          // For this one it's safe to always continue processing
          return true;
      }
  
      private void resumeFileOffsets() {
          if (genericFile == null) {
              return;
          }
  
          final Offset<?> lastOffset = getLastOffset(genericFile.getFile());
  
          if (lastOffset == null) {
              return;
          }
  
          Object offsetObj = lastOffset.getValue();
          if (offsetObj == null) {
              return;
          }
  
          if (offsetObj instanceof Long longOffsetObj) {
              genericFile.updateLastOffsetValue(longOffsetObj);
          } else {
              // This should never happen
              LOG.warn("Cannot perform a resume operation of an object of unhandled type: {}", offsetObj.getClass());
          }
      }
  
      @Override
      public void resume() {
          resumeFileOffsets();
      }
  
      public void deserializeFileOffset(File keyObj, Long valueObj) {
          FileOffset longOffset = (FileOffset) cache.computeIfAbsent(keyObj, obj -> new FileOffset());
  
          longOffset.update(valueObj);
      }
  }
  