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;
  
  import org.apache.kafka.server.common.ApiMessageAndVersion;
  import org.apache.kafka.server.common.OffsetAndEpoch;
  import org.apache.kafka.snapshot.SnapshotWriter;
  
  import java.util.ArrayList;
  import java.util.List;
  
  
  public class FakeSnapshotWriter implements SnapshotWriter<ApiMessageAndVersion> {
      private final OffsetAndEpoch snapshotId;
      private final List<List<ApiMessageAndVersion>> batches = new ArrayList<>();
      private boolean frozen = false;
      private boolean closed = false;
  
      public List<List<ApiMessageAndVersion>> batches() {
          return batches.stream().map(List::copyOf).toList();
      }
  
      public FakeSnapshotWriter() {
          this(new OffsetAndEpoch(100L, 10));
      }
  
      public FakeSnapshotWriter(OffsetAndEpoch snapshotId) {
          this.snapshotId = snapshotId;
      }
  
      @Override
      public OffsetAndEpoch snapshotId() {
          return snapshotId;
      }
  
      @Override
      public long lastContainedLogOffset() {
          return snapshotId().offset() - 1;
      }
  
      @Override
      public int lastContainedLogEpoch() {
          return snapshotId().epoch();
      }
  
      @Override
      public boolean isFrozen() {
          return frozen;
      }
  
      @Override
      public void append(List<ApiMessageAndVersion> batch) {
          if (frozen) {
              throw new IllegalStateException("Append not supported. Snapshot is already frozen.");
          }
          batches.add(batch);
      }
  
      @Override
      public long freeze() {
          frozen = true;
          return batches.size() * 100L;
      }
  
      @Override
      public void close() {
          closed = true;
      }
  
      public boolean isClosed() {
          return closed;
      }
  }