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.kafka.image.writer;
  
  import org.apache.kafka.image.MetadataDelta;
  import org.apache.kafka.image.MetadataImage;
  import org.apache.kafka.server.common.ApiMessageAndVersion;
  
  
  /**
   * ImageReWriter writes a metadata image out to another metadata image.
   *
   * There are a few reasons why you might want to do this. One is to obtain a MetadataDelta
   * object which contains everything in the image. Another is to translate an image from
   * one metadata version to another.
   */
  public class ImageReWriter implements ImageWriter {
      private final MetadataDelta delta;
      private boolean closed = false;
      private MetadataImage image = null;
  
      public ImageReWriter(MetadataDelta delta) {
          this.delta = delta;
      }
  
      @Override
      public void write(ApiMessageAndVersion record) {
          if (closed) throw new ImageWriterClosedException();
          delta.replay(record.message());
      }
  
      @Override
      public void close(boolean complete) {
          if (closed) return;
          closed = true;
          if (complete) {
              delta.finishSnapshot();
              image = delta.apply(delta.image().provenance());
          }
      }
  
      public MetadataImage image() {
          return image;
      }
  }
  