## org.das2.qstream.QdsToDas22

Write QDataSets that vary over at most 2 independent variables as a Das2 stream. Since Das2 streams can have at most 2 independent variables, higher dimensional (not necessarily higher rank) QDataSets can't be written using this code. Streams that can be written have the following plane structure X Y [Y Y Y Y ... ] X YScan [YScan YScan YScan ... ] X Y Z [Z Z Z Z ... ] All binary output is streamed in machine-native order. Since datasets written on one architecture are most likely to be read on the same architecture this choice causes the least amount of byte swapping. This is a direct serialization of QDataSet and does not require any legacy das2 dataset classes such as VectorDataset or TableDataset.

## QdsToDas22( )

## QdsToDas22( int genSigDigits, int fracSecDigits )

## canWrite

canWrite( QDataSet qds ) → boolean

Determine if a given dataset be serialized as a das2.2 stream

### Parameters

qds - The dataset to write

### Returns:

true if this dataset can be serialized as a das2.2 stream, false otherwise
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## write

write( QDataSet qds, java.io.OutputStream os ) → boolean

Write a QDataSet as a das2.2 stream To test whether it looks like this code could stream a dataset use the canWrite() function. This function may be called multiple times to add additional data to the stream. If a compatible header has already been emitted for a particular dataset it is not re-sent.

### Parameters

qds - The dataset to write, may have join's bundles etc. but no rank 3 or higher component datasets.
os - an open output stream, which is not closed by this code.

### Returns:

true if the entire dataset could be written, false otherwise. IO failures do not return false, they throw. False simply means that this code does not know how (or can't) stream the given dataset. Since deeper inspection occurs when actually writing the data then when testing, false may be returned even if canWrite() returned true.
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