public RunLengthEncodedBlockCursor(RandomAccessBlock value, int positionCount) {
    this.value = checkNotNull(value, "value is null");
    checkArgument(
        value.getPositionCount() == 1,
        "Expected value to contain a single position but has %s positions",
        value.getPositionCount());

    checkArgument(positionCount >= 0, "positionCount is negative");
    this.positionCount = positionCount;

    position = -1;
  }
 @Override
 public Type getType() {
   return value.getType();
 }
 @Override
 public int calculateHashCode() {
   return value.hashCode(0);
 }
 @Override
 public void appendTo(BlockBuilder blockBuilder) {
   value.appendTo(0, blockBuilder);
 }
 @Override
 public boolean isNull() {
   checkReadablePosition();
   return value.isNull(0);
 }
 @Override
 public int compareTo(Slice slice, int offset) {
   checkReadablePosition();
   return value.compareTo(0, slice, offset);
 }
 @Override
 public Object getObjectValue(Session session) {
   checkReadablePosition();
   return value.getObjectValue(session, 0);
 }
 @Override
 public Slice getSlice() {
   checkReadablePosition();
   return value.getSlice(0);
 }
 @Override
 public double getDouble() {
   checkReadablePosition();
   return value.getDouble(0);
 }
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 @Override
 public long getLong() {
   checkReadablePosition();
   return value.getLong(0);
 }
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 @Override
 public boolean getBoolean() {
   checkReadablePosition();
   return value.getBoolean(0);
 }