Examples of org.apache.lucene.util.UnsafeByteArrayOutputStream

org.apache.lucene.util.UnsafeByteArrayOutputStream
This class is used as a wrapper to a byte array, extending {@link OutputStream}. Data is written in the given byte[] buffer, until its length is insufficient. Than the buffer size is doubled and the data is written. This class is Unsafe as it is using a buffer which potentially can be changed from the outside. Moreover, when {@link #toByteArray()} is called, the bufferitself is returned, and not a copy. @lucene.experimental


  @Test
  public void testSimpleWrite() throws IOException {
    int length = 100;
    byte[] buffer = new byte[length];
    UnsafeByteArrayOutputStream ubaos = new UnsafeByteArrayOutputStream(buffer);


    for (int i = 0; i < 100; i++) {
      ubaos.write((byte) i);
    }


    byte[] result = ubaos.toByteArray();


    assertEquals(length, ubaos.length());


    for (int j = 0; j < length; ++j) {
      assertEquals(result[j], j);
    }
  }

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  @Test
  public void testArrayWrite() throws IOException {
    int length = 100;
    byte[] buffer = new byte[length];
    UnsafeByteArrayOutputStream ubaos = new UnsafeByteArrayOutputStream(buffer);


    for (int i = 0; i < 100; i++) {
      ubaos.write((byte) i);
    }


    int length2 = 10;
    byte[] buffer2 = new byte[length2];
    for (int i = 0; i < length2; i++) {
      buffer2[i] = (byte) (8 + i);
    }


    ubaos.write(buffer2);


    byte[] result = ubaos.toByteArray();


    assertEquals(length + length2, ubaos.length());


    for (int j = 0; j < length; ++j) {
      assertEquals(result[j], j);
    }
    for (int j = 0; j < length2; ++j) {

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  @Test
  public void testArrayWriteStartNotZero() throws IOException {
    int length = 100;
    byte[] buffer = new byte[length];
    UnsafeByteArrayOutputStream ubaos = new UnsafeByteArrayOutputStream(buffer);


    for (int i = 0; i < 100; i++) {
      ubaos.write((byte) i);
    }


    int length2 = 1000;
    byte[] buffer2 = new byte[length2];
    for (int i = 0; i < length2; i++) {
      buffer2[i] = (byte) (8 + i);
    }


    int length3 = 5;
    int start = 2;
    ubaos.write(buffer2, start, length3);


    byte[] result = ubaos.toByteArray();


    assertEquals(length + length3, ubaos.length());


    for (int j = 0; j < length; ++j) {
      assertEquals(result[j], j);
    }
    for (int j = 0; j < length3; ++j) {

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  @Test
  public void testBufferGrow() throws IOException {
    int length = 100;
    byte[] buffer = new byte[length / 10];
    UnsafeByteArrayOutputStream ubaos = new UnsafeByteArrayOutputStream(buffer);


    for (int i = 0; i < length; i++) {
      ubaos.write((byte) i);
    }


    byte[] result = ubaos.toByteArray();


    assertEquals(length, ubaos.length());


    for (int j = 0; j < length; ++j) {
      assertEquals(result[j], j);
    }


    buffer = ubaos.toByteArray();


    int length2 = 10;
    byte[] buffer2 = new byte[length2];
    for (int i = 0; i < length2; i++) {
      buffer2[i] = (byte) (8 + i);
    }


    ubaos.reInit(buffer2);
    for (int i = 0; i < length2; i++) {
      ubaos.write(7 + i);
    }


    byte[] result2 = ubaos.toByteArray();


    assertEquals(length2, ubaos.length());


    for (int j = 0; j < length2; ++j) {
      assertEquals(result2[j], j + 7);
    }

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    for (int i = 0; i < buf.length; i++) {
      buf[i] = (byte) i;
    }
    
    int startPos = 3;
    UnsafeByteArrayOutputStream ubaos = new UnsafeByteArrayOutputStream(buf, startPos);
    int numValues = 5;
    for (int i = 0; i < numValues; i++) {
      ubaos.write((i + 1) * 2);
    }


    // the length of the buffer should be whatever was written after startPos
    // and before that.
    assertEquals("invalid buffer length", startPos + numValues, ubaos.length());


    assertEquals("invalid startPos", startPos, ubaos.getStartPos());


    byte[] bytes = ubaos.toByteArray();
    for (int i = 0; i < startPos; i++) {
      assertEquals(i, bytes[i]);
    }
    
    for (int i = startPos, j = 0; j < numValues; i++, j++) {

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  }


  @Test
  public void testDefaultCtor() throws Exception {
    UnsafeByteArrayOutputStream ubaos = new UnsafeByteArrayOutputStream();
    int numValues = 5;
    for (int i = 0; i < numValues; i++) {
      ubaos.write(i);
    }


    assertEquals("invalid buffer length", numValues, ubaos.length());
    
    byte[] bytes = ubaos.toByteArray();
    for (int i = 0; i < numValues; i++) {
      assertEquals(i, bytes[i]);
    }
  }

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    }
  }
  
  @Test(expected=IllegalArgumentException.class)
  public void testIllegalBufferSize() throws Exception {
    UnsafeByteArrayOutputStream ubaos = new UnsafeByteArrayOutputStream();
    ubaos.reInit(new byte[0]);
  }

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org.apache.lucene.util.UnsafeByteArrayOutputStreamTest

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