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.beam.sdk.util;
  
  import static org.junit.Assert.assertArrayEquals;
  import static org.junit.Assert.assertEquals;
  
  import java.io.ByteArrayOutputStream;
  import java.io.FilterOutputStream;
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Unit tests for {@link UnownedOutputStream}. */
  @RunWith(JUnit4.class)
  public class UnownedOutputStreamTest {
    @Rule public ExpectedException expectedException = ExpectedException.none();
    private ByteArrayOutputStream baos;
    private UnownedOutputStream os;
  
    @Before
    public void setup() {
      baos = new ByteArrayOutputStream();
      os = new UnownedOutputStream(baos);
    }
  
    @Test
    public void testHashCodeEqualsAndToString() throws Exception {
      assertEquals(baos.hashCode(), os.hashCode());
      assertEquals("UnownedOutputStream{out=" + baos + "}", os.toString());
      assertEquals(new UnownedOutputStream(baos), os);
    }
  
    @Test
    public void testClosingThrows() throws Exception {
      expectedException.expect(UnsupportedOperationException.class);
      expectedException.expectMessage("Caller does not own the underlying");
      os.close();
    }
  
    @Test
    public void testWrite() throws IOException {
      CallCountOutputStream fsCount = new CallCountOutputStream();
      FilterOutputStream fs = new FilterOutputStream(fsCount);
      CallCountOutputStream osCount = new CallCountOutputStream();
      UnownedOutputStream os = new UnownedOutputStream(osCount);
  
      byte[] data = "Hello World!".getBytes(StandardCharsets.UTF_8);
      fs.write(data, 0, data.length);
      os.write(data, 0, data.length);
      fs.write('\n');
      os.write('\n');
  
      assertEquals(13, fsCount.callCnt);
      assertEquals(2, osCount.callCnt);
      assertArrayEquals(fsCount.toByteArray(), osCount.toByteArray());
    }
  
    private static final class CallCountOutputStream extends ByteArrayOutputStream {
      int callCnt;
  
      @Override
      public synchronized void write(int b) {
        callCnt++;
        super.write(b);
      }
  
      @Override
      public synchronized void write(byte[] b, int off, int len) {
        callCnt++;
        super.write(b, off, len);
      }
    }
  }
  