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
   *
   *     https://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.avro.grpc;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  
  import io.grpc.Drainable;
  
  /**
   * An {@link InputStream} backed by Avro RPC request/response that can drained
   * to a{@link OutputStream}.
   */
  public abstract class AvroInputStream extends InputStream implements Drainable {
    /**
     * Container to hold the serialized Avro payload when its read before draining
     * it.
     */
    private ByteArrayInputStream partial;
  
    @Override
    public int read(byte[] b, int off, int len) throws IOException {
      return getPartialInternal().read(b, off, len);
    }
  
    @Override
    public int read() throws IOException {
      return getPartialInternal().read();
    }
  
    private ByteArrayInputStream getPartialInternal() throws IOException {
      if (partial == null) {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        drainTo(outputStream);
        partial = new ByteArrayInputStream(outputStream.toByteArray());
      }
      return partial;
    }
  
    protected ByteArrayInputStream getPartial() {
      return partial;
    }
  
    /**
     * An {@link OutputStream} that writes to a target {@link OutputStream} and
     * provides total number of bytes written to it.
     */
    protected static class CountingOutputStream extends OutputStream {
      private final OutputStream target;
      private int writtenCount = 0;
  
      public CountingOutputStream(OutputStream target) {
        this.target = target;
      }
  
      @Override
      public void write(byte[] b, int off, int len) throws IOException {
        target.write(b, off, len);
        writtenCount += len;
      }
  
      @Override
      public void write(int b) throws IOException {
        target.write(b);
        writtenCount += 1;
      }
  
      @Override
      public void flush() throws IOException {
        target.flush();
      }
  
      @Override
      public void close() throws IOException {
        target.close();
      }
  
      public int getWrittenCount() {
        return writtenCount;
      }
    }
  }
  