本文整理了Java中io.airlift.slice.Slice.slice()方法的一些代码示例，展示了Slice.slice()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Slice.slice()方法的具体详情如下：
包路径：io.airlift.slice.Slice
类名称：Slice
方法名：slice

Slice.slice介绍

[英]Returns a slice of this buffer's sub-region. Modifying the content of the returned buffer or this buffer affects each other's content.
[中]返回此缓冲区子区域的一个切片。修改返回的缓冲区或此缓冲区的内容会影响彼此的内容。

代码示例

代码示例来源：origin: prestodb/presto

@Override
public Block getRegion(int positionOffset, int length)
{
  checkValidRegion(positionCount, positionOffset, length);
  Slice newSlice = slice.slice(positionOffset * fixedSize, length * fixedSize);
  Slice newValueIsNull = null;
  if (valueIsNull != null) {
    newValueIsNull = valueIsNull.slice(positionOffset, length);
  }
  return new FixedWidthBlock(fixedSize, length, newSlice, newValueIsNull);
}

代码示例来源：origin: prestodb/presto

public static Slice truncateToLength(Slice slice, int maxLength)
{
  requireNonNull(slice, "slice is null");
  if (maxLength < 0) {
    throw new IllegalArgumentException("Max length must be greater or equal than zero");
  }
  if (maxLength == 0) {
    return Slices.EMPTY_SLICE;
  }
  return slice.slice(0, byteCount(slice, 0, slice.length(), maxLength));
}

代码示例来源：origin: prestodb/presto

public static Slice trimTrailingSpaces(Slice slice)
{
  requireNonNull(slice, "slice is null");
  return slice.slice(0, byteCountWithoutTrailingSpace(slice, 0, slice.length()));
}

代码示例来源：origin: prestodb/presto

private void closeChunk()
{
  // add trimmed view of slice to closed slices
  closedSlices.add(slice.slice(0, bufferPosition));
  // create a new buffer
  // double size until we hit the max chunk size
  buffer = chunkSupplier.get();
  slice = Slices.wrappedBuffer(buffer);
  streamOffset += bufferPosition;
  bufferPosition = 0;
}

代码示例来源：origin: prestodb/presto

private void closeChunk()
{
  // add trimmed view of slice to closed slices
  closedSlices.add(slice.slice(0, bufferPosition));
  closedSlicesRetainedSize += slice.getRetainedSize();
  // create a new buffer
  // double size until we hit the max chunk size
  buffer = chunkSupplier.get();
  slice = Slices.wrappedBuffer(buffer);
  streamOffset += bufferPosition;
  bufferPosition = 0;
}

代码示例来源：origin: prestodb/presto

@Override
public Block getRegion(int positionOffset, int length)
{
  int positionCount = getPositionCount();
  checkValidRegion(positionCount, positionOffset, length);
  Slice newSlice = sliceOutput.slice().slice(positionOffset * fixedSize, length * fixedSize);
  Slice newValueIsNull = null;
  if (hasNullValue) {
    newValueIsNull = valueIsNull.slice().slice(positionOffset, length);
  }
  return new FixedWidthBlock(fixedSize, length, newSlice, newValueIsNull);
}

代码示例来源：origin: prestodb/presto

@Override
public Slice getSlice(int position, int offset, int length)
{
  checkReadablePosition(position);
  return getRawSlice().slice(valueOffset(position) + offset, length);
}

代码示例来源：origin: prestodb/presto

@Override
public Slice getSlice(int position, int offset, int length)
{
  checkReadablePosition(position);
  return getRawSlice(position).slice(getPositionOffset(position) + offset, length);
}

代码示例来源：origin: prestodb/presto

public static String truncateIfNecessaryForErrorMessage(Slice json)
{
  if (json.length() <= MAX_JSON_LENGTH_IN_ERROR_MESSAGE) {
    return json.toStringUtf8();
  }
  else {
    return json.slice(0, MAX_JSON_LENGTH_IN_ERROR_MESSAGE).toStringUtf8() + "...(truncated)";
  }
}

代码示例来源：origin: prestodb/presto

public Slice loadNestedDiskRangeBuffer(DiskRange nestedDiskRange)
{
  load();
  checkArgument(diskRange.contains(nestedDiskRange));
  int offset = toIntExact(nestedDiskRange.getOffset() - diskRange.getOffset());
  return bufferSlice.slice(offset, nestedDiskRange.getLength());
}

代码示例来源：origin: prestodb/presto

public Block split(Slice source)
{
  Matcher matcher = re2jPattern.matcher(source);
  BlockBuilder blockBuilder = VARCHAR.createBlockBuilder(null, 32);
  int lastEnd = 0;
  while (matcher.find()) {
    Slice slice = source.slice(lastEnd, matcher.start() - lastEnd);
    lastEnd = matcher.end();
    VARCHAR.writeSlice(blockBuilder, slice);
  }
  VARCHAR.writeSlice(blockBuilder, source.slice(lastEnd, source.length() - lastEnd));
  return blockBuilder.build();
}

代码示例来源：origin: prestodb/presto

@Test
public void testCompactBlock()
{
  Slice compactSlice = Slices.copyOf(createExpectedValue(16));
  Slice incompactSlice = Slices.copyOf(createExpectedValue(20)).slice(0, 16);
  int[] offsets = {0, 1, 1, 2, 4, 8, 16};
  boolean[] valueIsNull = {false, true, false, false, false, false};
  testCompactBlock(new VariableWidthBlock(0, EMPTY_SLICE, new int[1], Optional.empty()));
  testCompactBlock(new VariableWidthBlock(valueIsNull.length, compactSlice, offsets, Optional.of(valueIsNull)));
  testIncompactBlock(new VariableWidthBlock(valueIsNull.length - 1, compactSlice, offsets, Optional.of(valueIsNull)));
  // underlying slice is not compact
  testIncompactBlock(new VariableWidthBlock(valueIsNull.length, incompactSlice, offsets, Optional.of(valueIsNull)));
}

代码示例来源：origin: prestodb/presto

@Description("suffix starting at given index")
@ScalarFunction
@LiteralParameters("x")
@SqlType("varchar(x)")
public static Slice substr(@SqlType("varchar(x)") Slice utf8, @SqlType(StandardTypes.BIGINT) long start)
{
  if ((start == 0) || utf8.length() == 0) {
    return Slices.EMPTY_SLICE;
  }
  int startCodePoint = Ints.saturatedCast(start);
  if (startCodePoint > 0) {
    int indexStart = offsetOfCodePoint(utf8, startCodePoint - 1);
    if (indexStart < 0) {
      // before beginning of string
      return Slices.EMPTY_SLICE;
    }
    int indexEnd = utf8.length();
    return utf8.slice(indexStart, indexEnd - indexStart);
  }
  // negative start is relative to end of string
  int codePoints = countCodePoints(utf8);
  startCodePoint += codePoints;
  // before beginning of string
  if (startCodePoint < 0) {
    return Slices.EMPTY_SLICE;
  }
  int indexStart = offsetOfCodePoint(utf8, startCodePoint);
  int indexEnd = utf8.length();
  return utf8.slice(indexStart, indexEnd - indexStart);
}

代码示例来源：origin: prestodb/presto

@Test
public void testCompactBlock()
{
  Slice compactSlice = Slices.copyOf(createExpectedValue(24));
  Slice incompactSlice = Slices.copyOf(createExpectedValue(30)).slice(0, 24);
  boolean[] valueIsNull = {false, true, false, false, false, false};
  testCompactBlock(new FixedWidthBlock(4, 0, EMPTY_SLICE, Optional.empty()));
  testCompactBlock(new FixedWidthBlock(4, valueIsNull.length, compactSlice, Optional.of(Slices.wrappedBooleanArray(valueIsNull))));
  testIncompactBlock(new FixedWidthBlock(4, valueIsNull.length - 1, compactSlice, Optional.of(Slices.wrappedBooleanArray(valueIsNull))));
  // underlying slice is not compact
  testIncompactBlock(new FixedWidthBlock(4, valueIsNull.length, incompactSlice, Optional.of(Slices.wrappedBooleanArray(valueIsNull))));
}

代码示例来源：origin: prestodb/presto

indexEnd = slice.length();
  return slice.slice(indexStart, indexEnd - indexStart);
return slice.slice(indexStart, indexEnd - indexStart);

代码示例来源：origin: prestodb/presto

protected void assertSlicePosition(Block block, int position, Slice expectedSliceValue)
{
  int length = block.getSliceLength(position);
  assertEquals(length, expectedSliceValue.length());
  Block expectedBlock = toSingeValuedBlock(expectedSliceValue);
  for (int offset = 0; offset < length - 3; offset++) {
    assertEquals(block.getSlice(position, offset, 3), expectedSliceValue.slice(offset, 3));
    assertTrue(block.bytesEqual(position, offset, expectedSliceValue, offset, 3));
    // if your tests fail here, please change your test to not use this value
    assertFalse(block.bytesEqual(position, offset, Slices.utf8Slice("XXX"), 0, 3));
    assertEquals(block.bytesCompare(position, offset, 3, expectedSliceValue, offset, 3), 0);
    assertTrue(block.bytesCompare(position, offset, 3, expectedSliceValue, offset, 2) > 0);
    Slice greaterSlice = createGreaterValue(expectedSliceValue, offset, 3);
    assertTrue(block.bytesCompare(position, offset, 3, greaterSlice, 0, greaterSlice.length()) < 0);
    assertTrue(block.equals(position, offset, expectedBlock, 0, offset, 3));
    assertEquals(block.compareTo(position, offset, 3, expectedBlock, 0, offset, 3), 0);
    BlockBuilder blockBuilder = VARBINARY.createBlockBuilder(null, 1);
    block.writeBytesTo(position, offset, 3, blockBuilder);
    blockBuilder.closeEntry();
    Block segment = blockBuilder.build();
    assertTrue(block.equals(position, offset, segment, 0, 0, 3));
  }
}

代码示例来源：origin: prestodb/presto

@SqlNullable
@Description("returns regex group of extracted string with a pattern")
@ScalarFunction
@LiteralParameters("x")
@SqlType("varchar(x)")
public static Slice regexpExtract(@SqlType("varchar(x)") Slice source, @SqlType(JoniRegexpType.NAME) Regex pattern, @SqlType(StandardTypes.BIGINT) long groupIndex)
{
  Matcher matcher = pattern.matcher(source.getBytes());
  validateGroup(groupIndex, matcher.getEagerRegion());
  int group = toIntExact(groupIndex);
  int offset = matcher.search(0, source.length(), Option.DEFAULT);
  if (offset == -1) {
    return null;
  }
  Region region = matcher.getEagerRegion();
  int beg = region.beg[group];
  int end = region.end[group];
  if (beg == -1) {
    // end == -1 must be true
    return null;
  }
  Slice slice = source.slice(beg, end - beg);
  return slice;
}

代码示例来源：origin: prestodb/presto

@Override
public Block decodeColumn(ColumnData columnData)
{
  int size = columnData.rowCount();
  BlockBuilder builder = type.createBlockBuilder(null, size);
  Slice slice = columnData.getSlice();
  for (int i = 0; i < size; i++) {
    int length = columnData.getLength(i);
    if (length > 0) {
      int offset = columnData.getOffset(i);
      if ((length == 1) && slice.getByte(offset) == HIVE_EMPTY_STRING_BYTE) {
        type.writeSlice(builder, EMPTY_SLICE);
      }
      else {
        length = calculateTruncationLength(type, slice, offset, length);
        type.writeSlice(builder, slice.slice(offset, length));
      }
    }
    else {
      builder.appendNull();
    }
  }
  return builder.build();
}

代码示例来源：origin: prestodb/presto

@ScalarFunction
@LiteralParameters("x")
@Description("returns array of strings split by pattern")
@SqlType("array(varchar(x))")
public static Block regexpSplit(@SqlType("varchar(x)") Slice source, @SqlType(JoniRegexpType.NAME) Regex pattern)
{
  Matcher matcher = pattern.matcher(source.getBytes());
  BlockBuilder blockBuilder = VARCHAR.createBlockBuilder(null, 32);
  int lastEnd = 0;
  int nextStart = 0;
  while (true) {
    int offset = matcher.search(nextStart, source.length(), Option.DEFAULT);
    if (offset == -1) {
      break;
    }
    if (matcher.getEnd() == matcher.getBegin()) {
      nextStart = matcher.getEnd() + 1;
    }
    else {
      nextStart = matcher.getEnd();
    }
    Slice slice = source.slice(lastEnd, matcher.getBegin() - lastEnd);
    lastEnd = matcher.getEnd();
    VARCHAR.writeSlice(blockBuilder, slice);
  }
  VARCHAR.writeSlice(blockBuilder, source.slice(lastEnd, source.length() - lastEnd));
  return blockBuilder.build();
}

代码示例来源：origin: prestodb/presto

return inputSlice.slice(0, resultLength);