uk.ac.starlink.table.formats

Class WDCTableBuilder

java.lang.Object

uk.ac.starlink.table.formats.DocumentedTableBuilder

uk.ac.starlink.table.formats.WDCTableBuilder

All Implemented Interfaces:

Documented, DocumentedIOHandler, TableBuilder

public class WDCTableBuilder
extends DocumentedTableBuilder

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.

Constructor Summary

Constructors

Constructor and Description
WDCTableBuilder()

Method Summary

Modifier and Type	Method and Description
boolean	canImport(java.awt.datatransfer.DataFlavor flavor) Returns false since there is no MIME type which targets WDC format.
boolean	canStream() Indicates whether this handler can read tables from a stream.
boolean	docIncludesExample() Indicates whether the serialization of some (short) example table should be added to the user documentation for this handler.
java.lang.String	getFormatName() Returns the name of the format which can be read by this handler.
java.lang.String	getXmlDescription() Returns user-directed documentation in XML format.
StarTable	makeStarTable(DataSource datsrc, boolean wantRandom, StoragePolicy storagePolicy) Constructs a StarTable 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.

Methods inherited from class uk.ac.starlink.table.formats.DocumentedTableBuilder

getExtensions, looksLikeFile

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface uk.ac.starlink.table.formats.DocumentedIOHandler

matchesExtension, readText, toLink

Constructor Detail

WDCTableBuilder

public WDCTableBuilder()

Method Detail

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.

Returns:

one-word description of this handler's format

makeStarTable

public StarTable makeStarTable(DataSource datsrc,
                               boolean wantRandom,
                               StoragePolicy storagePolicy)
                        throws java.io.IOException

Description copied from interface: TableBuilder

Constructs a StarTable 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 a TableFormatException 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 supplied storagePolicy, or any other resource-expensive measure, to randomise a sequential table just because the wantRandom parameter is true.

Parameters:

datsrc - the DataSource containing the table resource

wantRandom - whether, preferentially, a random access table should be returned

storagePolicy - 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 handler

java.io.IOException - if an unexpected I/O error occurs during processing

canImport

public boolean canImport(java.awt.datatransfer.DataFlavor flavor)

Returns false since there is no MIME type which targets WDC format.

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

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.

Parameters:

in - input stream containing table data

sink - destination of the table

pos - position identifier describing the location of the table within the stream; see DataSource.getPosition() (may be null)

Throws:

TableFormatException - if the table can't be streamed or the data is malformed

canStream

public boolean canStream()

Description copied from class: DocumentedTableBuilder

Indicates whether this handler can read tables from a stream.

Specified by:

canStream in class DocumentedTableBuilder

Returns:

true iff this handler can read from streams

docIncludesExample

public boolean docIncludesExample()

Description copied from interface: DocumentedIOHandler

Indicates whether the serialization of some (short) example table should be added to the user documentation for this handler. Binary formats, or instances for which the Documented.getXmlDescription() method already includes some example output, should return false.

Returns:

true if the user documentation would benefit from the addition of an example serialization

getXmlDescription

public java.lang.String getXmlDescription()

Description copied from interface: Documented

Returns user-directed documentation in XML format.

The output should be a sequence of one or more <P> elements, using XHTML-like XML. Since rendering may be done in a number of contexts however, use of the full range of XHTML elements is discouraged. Where possible, the content should stick to simple markup such as the elements P, A, UL, OL, LI, DL, DT, DD EM, STRONG, I, B, CODE, TT, PRE.

Returns:

XML description of this object

readLine

public static java.lang.String readLine(java.io.BufferedInputStream strm)
                                 throws java.io.IOException

Throws:

java.io.IOException