uk.ac.starlink.gbin

Class GbinTableBuilder

java.lang.Object

uk.ac.starlink.table.formats.DocumentedTableBuilder

uk.ac.starlink.gbin.GbinTableBuilder

All Implemented Interfaces:

Documented, DocumentedIOHandler, TableBuilder

public class GbinTableBuilder
extends DocumentedTableBuilder

TableBuilder implementation for GBIN files.

Since:

14 Aug 2014

Author:

Mark Taylor

Field Summary

Fields

Modifier and Type	Field and Description
static ValueInfo	BUILDDESCRIP_INFO ValueInfo for GBIN build description string.
static ValueInfo	CLASSNAME_INFO ValueInfo for GBIN row object classname.
static ValueInfo	COLDETAIL_INFO ValueInfo for Gaia column detailed description string.
static ValueInfo	DESCRIP_INFO ValueInfo for Gaia table description string.
static ValueInfo	GAIATABLENAME_INFO ValueInfo for well-known Gaia table name.

Constructor Summary

Constructors

Constructor and Description
GbinTableBuilder() Constructs a builder with default options.
GbinTableBuilder(GbinTableProfile profile) Constructs a builder with custom options.

Method Summary

Modifier and Type	Method and Description
boolean	canImport(DataFlavor flavor) Indicates whether this builder is able to turn a resource of media type indicated by flavor into a table.
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.
String	getFormatName() Returns "GBIN".
boolean	getHierarchicalNames() Returns value of GbinTableProfile.isHierarchicalNames().
GbinTableProfile	getProfile() Returns the object configuring how GBIN files are mapped to tables.
boolean	getReadMeta() Returns value of GbinTableProfile.isReadMeta().
String	getXmlDescription() Returns user-directed documentation in XML format.
void	isSortedMethods(boolean isSortedMethods) Configures value of GbinTableProfile.isSortedMethods().
StarTable	makeStarTable(DataSource datsrc, boolean wantRandom, StoragePolicy storage) Constructs a StarTable based on a given DataSource.
void	setHierarchicalNames(boolean isHierarchicalNames) Configures value of GbinTableProfile.isHierarchicalNames()
void	setReadMeta(boolean isReadMeta) Configures value of GbinTableProfile.isReadMeta().
void	setTestMagic(boolean isTestMagic) Configures value of GbinTableProfile.isTestMagic().
void	streamStarTable(InputStream in, TableSink sink, String pos) Reads a table from an input stream and writes it a row at a time to a sink.

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

Field Detail

CLASSNAME_INFO

public static final ValueInfo CLASSNAME_INFO

ValueInfo for GBIN row object classname.

GAIATABLENAME_INFO

public static final ValueInfo GAIATABLENAME_INFO

ValueInfo for well-known Gaia table name.

DESCRIP_INFO

public static final ValueInfo DESCRIP_INFO

ValueInfo for Gaia table description string.

COLDETAIL_INFO

public static final ValueInfo COLDETAIL_INFO

ValueInfo for Gaia column detailed description string.

BUILDDESCRIP_INFO

public static final ValueInfo BUILDDESCRIP_INFO

ValueInfo for GBIN build description string.

Constructor Detail

GbinTableBuilder

public GbinTableBuilder()

Constructs a builder with default options.

GbinTableBuilder

public GbinTableBuilder(GbinTableProfile profile)

Constructs a builder with custom options.

Parameters:

profile - configures how GBIN files will be mapped to a table

Method Detail

getProfile

public GbinTableProfile getProfile()

Returns the object configuring how GBIN files are mapped to tables. Note this may be a modified version of the object supplied at construction time.

Returns:

configuration profile

getFormatName

public String getFormatName()

Returns "GBIN".

Returns:

one-word description of this handler's format

canImport

public boolean canImport(DataFlavor flavor)

Description copied from interface: TableBuilder

Indicates whether this builder is able to turn a resource of media type indicated by flavor into a table. It should return true if it thinks that its TableBuilder.streamStarTable(java.io.InputStream, uk.ac.starlink.table.TableSink, java.lang.String) method stands a reasonable chance of successfully constructing a StarTable from a DataSource whose input stream is described by the DataFlavor flavor. It will typically make this determination based on the flavor's MIME type.

This method should only return true if the flavor looks like it is targeted at this builder; for instance a builder which uses a text-based format should return false for a flavor which indicates a MIME type of text/plain.

This method is used in supporting drag and drop functionality (see StarTableFactory.canImport(java.awt.datatransfer.DataFlavor[])).

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(InputStream in,
                            TableSink sink,
                            String pos)
                     throws IOException

Description copied from interface: TableBuilder

Reads a table from an input stream and writes it a row at a time to a sink. Not all implementations will be able to do this; for instance, extracting the table from the data may be a two-pass process. Implementations which are unable to perform this function should throw a TableFormatException.

The input stream should be prepared for use prior to calling this method, so implementations should not in general attempt to decompress or buffer istrm.

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

IOException - if some other error occurs

makeStarTable

public StarTable makeStarTable(DataSource datsrc,
                               boolean wantRandom,
                               StoragePolicy storage)
                        throws 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

storage - 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

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

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 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

setReadMeta

@ConfigMethod(property="readMeta",
              doc="<p>Configures whether the GBIN metadata will be read prior to reading the data. This may slow things down slightly, but means the row count can be determined up front, which may have benefits for downstream processing.</p>\n<p>Setting this false can prevent failing on an error related to a broken version of the zStd-jni library in GaiaTools.\nNote however that in this case the data read, though not reporting an error, will silently be missing some rows from the GBIN file.</p>\n",
              example="false")
public void setReadMeta(boolean isReadMeta)

Configures value of GbinTableProfile.isReadMeta().

Parameters:

isReadMeta - true to read metadata up front

getReadMeta

public boolean getReadMeta()

Returns value of GbinTableProfile.isReadMeta().

Returns:

read meta flag

setHierarchicalNames

@ConfigMethod(property="hierarchicalNames",
              doc="<p>Configures whether column names in the output table should be forced to reflect the compositional hierarchy of their position in the element objects.\nIf set true, columns will have names like \"<code>Astrometry_Alpha</code>\", if false they may just be called \"<code>Alpha</code>\".\nIn case of name duplication however, the hierarchical form is always used.</p>\n",
              example="true")
public void setHierarchicalNames(boolean isHierarchicalNames)

Configures value of GbinTableProfile.isHierarchicalNames()

Parameters:

isHierarchicalNames - whether to name columns hierarchically

getHierarchicalNames

public boolean getHierarchicalNames()

Returns value of GbinTableProfile.isHierarchicalNames().

Returns:

hierarchical naming flag

setTestMagic

public void setTestMagic(boolean isTestMagic)

Configures value of GbinTableProfile.isTestMagic().

Parameters:

isTestMagic - whether to read magic number from GBIN files

isSortedMethods

public void isSortedMethods(boolean isSortedMethods)

Configures value of GbinTableProfile.isSortedMethods().

Parameters:

isSortedMethods - whether to sort method names alphabetically