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.common.utils;
  
  import org.junit.jupiter.api.Test;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class ByteBufferOutputStreamTest {
  
      @Test
      public void testExpandByteBufferOnPositionIncrease() throws Exception {
          testExpandByteBufferOnPositionIncrease(ByteBuffer.allocate(16));
      }
  
      @Test
      public void testExpandDirectByteBufferOnPositionIncrease() throws Exception {
          testExpandByteBufferOnPositionIncrease(ByteBuffer.allocateDirect(16));
      }
  
      private void testExpandByteBufferOnPositionIncrease(ByteBuffer initialBuffer) throws Exception {
          ByteBufferOutputStream output = new ByteBufferOutputStream(initialBuffer);
          output.write("hello".getBytes());
          output.position(32);
          assertEquals(32, output.position());
          assertEquals(0, initialBuffer.position());
  
          ByteBuffer buffer = output.buffer();
          assertEquals(32, buffer.limit());
          buffer.position(0);
          buffer.limit(5);
          byte[] bytes = new byte[5];
          buffer.get(bytes);
          assertArrayEquals("hello".getBytes(), bytes);
          output.close();
      }
  
      @Test
      public void testExpandByteBufferOnWrite() throws Exception {
          testExpandByteBufferOnWrite(ByteBuffer.allocate(16));
      }
  
      @Test
      public void testExpandDirectByteBufferOnWrite() throws Exception {
          testExpandByteBufferOnWrite(ByteBuffer.allocateDirect(16));
      }
  
      private void testExpandByteBufferOnWrite(ByteBuffer initialBuffer) throws Exception {
          ByteBufferOutputStream output = new ByteBufferOutputStream(initialBuffer);
          output.write("hello".getBytes());
          output.write(new byte[27]);
          assertEquals(32, output.position());
          assertEquals(0, initialBuffer.position());
  
          ByteBuffer buffer = output.buffer();
          assertEquals(32, buffer.limit());
          buffer.position(0);
          buffer.limit(5);
          byte[] bytes = new byte[5];
          buffer.get(bytes);
          assertArrayEquals("hello".getBytes(), bytes);
          output.close();
      }
  
      @Test
      public void testWriteByteBuffer() throws IOException {
          testWriteByteBuffer(ByteBuffer.allocate(16));
      }
  
      @Test
      public void testWriteDirectByteBuffer() throws IOException {
          testWriteByteBuffer(ByteBuffer.allocateDirect(16));
      }
  
      private void testWriteByteBuffer(ByteBuffer input) throws IOException {
          long value = 234239230L;
          input.putLong(value);
          input.flip();
  
          ByteBufferOutputStream output = new ByteBufferOutputStream(ByteBuffer.allocate(32));
          output.write(input);
          assertEquals(8, input.position());
          assertEquals(8, output.position());
          assertEquals(value, output.buffer().getLong(0));
          output.close();
      }
  
  }
  