content: /*
   * Copyright (C) 2025 AlexMofer
   *
   * 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 io.github.alexmofer.android.support.io;
  
  import androidx.annotation.NonNull;
  import androidx.annotation.Nullable;
  
  import java.io.FilterOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.util.function.LongConsumer;
  
  /**
   * OutputStream 写入计数.
   * Created by Alex on 2025/7/7.
   *
   * @since 1.12.0
   */
  public final class CountingOutputStream extends FilterOutputStream {
  
      private final LongConsumer progress;
      private long count;
  
      public CountingOutputStream(@NonNull OutputStream out, @Nullable LongConsumer progress) {
          super(out);
          this.progress = progress;
      }
  
      /**
       * 获取总数
       *
       * @return 总数
       */
      public long getCount() {
          return count;
      }
  
      @Override
      public void write(byte[] b, int off, int len) throws IOException {
          out.write(b, off, len);
          count += len;
          notifyProgress();
      }
  
      @Override
      public void write(int b) throws IOException {
          out.write(b);
          count++;
          notifyProgress();
      }
  
      @Override
      public void close() throws IOException {
          out.close();
      }
  
      private void notifyProgress() {
          if (progress != null) {
              progress.accept(count);
          }
      }
  }
  