Class WDCTableBuilder
- java.lang.Object
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- uk.ac.starlink.table.formats.WDCTableBuilder
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- All Implemented Interfaces:
TableBuilder
public class WDCTableBuilder extends java.lang.Object implements TableBuilder
Implementation of the TableBuilder interface which gets StarTables from World Data Centre-type text files. This format doesn't appear to have a proper name or definition. This implementation is a result of reverse-engineering the format specification by looking at a couple of files.- Author:
- Mark Taylor (Starlink)
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Constructor Summary
Constructors Constructor Description WDCTableBuilder()
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
canImport(java.awt.datatransfer.DataFlavor flavor)
Returns false since there is no MIME type which targets WDC format.java.lang.String
getFormatName()
Returns the name of the format which can be read by this handler.StarTable
makeStarTable(uk.ac.starlink.util.DataSource datsrc, boolean wantRandom, StoragePolicy storagePolicy)
Constructs aStarTable
based on a given DataSource.static java.lang.String
readLine(java.io.BufferedInputStream strm)
void
streamStarTable(java.io.InputStream in, TableSink sink, java.lang.String pos)
Throws an exception; streaming of WDC tables is not implemented.
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Method Detail
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getFormatName
public java.lang.String getFormatName()
Description copied from interface:TableBuilder
Returns the name of the format which can be read by this handler. Matching against this string may be used by callers to identify or select this handler from a list.- Specified by:
getFormatName
in interfaceTableBuilder
- Returns:
- one-word description of this handler's format
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makeStarTable
public StarTable makeStarTable(uk.ac.starlink.util.DataSource datsrc, boolean wantRandom, StoragePolicy storagePolicy) throws java.io.IOException
Description copied from interface:TableBuilder
Constructs aStarTable
based on a given DataSource. If the source is not recognised or this builder does not know how to construct a table from it, then aTableFormatException
should be thrown. If this builder thinks it should be able to handle the source but an error occurs during processing, an IOException can be thrown.The wantRandom parameter is used to indicate whether, ideally, a random-access table should be returned. There is no requirement for the builder to honour this request, but if it knows how to make both random and non-random tables, it can use this flag to decide which to return.
Note: the presence of the
wantRandom
parameter is somewhat misleading. TableBuilder implementations usually should, and do, ignore it (it would be removed from the interface if it were not for backward compatibility issues). Regardless of the value of this parameter, implementations should return a random-access table only if it is easy for them to do so; in particular they should not use the suppliedstoragePolicy
, or any other resource-expensive measure, to randomise a sequential table just because thewantRandom
parameter is true.- Specified by:
makeStarTable
in interfaceTableBuilder
- Parameters:
datsrc
- the DataSource containing the table resourcewantRandom
- whether, preferentially, a random access table should be returnedstoragePolicy
- a StoragePolicy object which may be used to supply scratch storage if the builder needs it- Returns:
- a StarTable made out of datsrc
- Throws:
TableFormatException
- if the table is not of a kind that can be handled by this handlerjava.io.IOException
- if an unexpected I/O error occurs during processing
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canImport
public boolean canImport(java.awt.datatransfer.DataFlavor flavor)
Returns false since there is no MIME type which targets WDC format.- Specified by:
canImport
in interfaceTableBuilder
- Parameters:
flavor
- the DataFlavor whose suitability as stream input is to be assessed- Returns:
- true iff this builder reckons it stands a good chance of turning a stream of type flavor into a StarTable
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streamStarTable
public void streamStarTable(java.io.InputStream in, TableSink sink, java.lang.String pos) throws TableFormatException
Throws an exception; streaming of WDC tables is not implemented. It probably could be if necessary.- Specified by:
streamStarTable
in interfaceTableBuilder
- Parameters:
in
- input stream containing table datasink
- destination of the tablepos
- position identifier describing the location of the table within the stream; seeDataSource.getPosition()
(may be null)- Throws:
TableFormatException
- if the table can't be streamed or the data is malformed
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readLine
public static java.lang.String readLine(java.io.BufferedInputStream strm) throws java.io.IOException
- Throws:
java.io.IOException
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