uk.ac.starlink.votable
Class VOTableVersion

java.lang.Object
  extended by uk.ac.starlink.votable.VOTableVersion

public abstract class VOTableVersion
extends Object

Provides characteristics for a given version of the VOTable standard. An instance of this class is passed to a VOTableWriter to indicate what version of the standard should be followed when generating VOTable output.

Since:
15 Nov 2012

Field Summary
static String DEFAULT_VERSION_STRING
          Default VOTable version number which output will conform to if not otherwise specified ("1.3").
static VOTableVersion V10
          VOTable 1.0.
static VOTableVersion V11
          VOTable 1.1.
static VOTableVersion V12
          VOTable 1.2.
static VOTableVersion V13
          VOTable 1.3.
static String VOTABLE_VERSION_PROP
          System property name whose value gives the default VOTable version written by instances of this class if no version is given explicitly.
 
Constructor Summary
protected VOTableVersion(String versionNumber)
          Constructor.
 
Method Summary
abstract  boolean allowBinary2()
          Indicates whether the BINARY2 serialization format is defined by this version.
abstract  boolean allowEmptyTd()
          Indicates whether this version permits an empty TD element to represent a null value for all data types.
abstract  boolean allowXtype()
          Indicates whether the xtype attribute is permitted on FIELD elements etc in this version.
static VOTableVersion getDefaultVersion()
          Returns the version instance used by default for output in this JVM.
abstract  String getDoctypeDeclaration()
          Returns the text of the DOCTYPE XML declaration for this version.
abstract  URL getDtdUrl()
          Returns a URL from which the DTD can be retrieved.
static Map<String,VOTableVersion> getKnownVersions()
          Returns a number->version map for all known versions.
abstract  Schema getSchema()
          Returns a schema which may be used to validate document instances of this VOTable version.
abstract  String getSchemaLocation()
          Returns the URL of the VOTable schema corresponding to this version.
 String getVersionNumber()
          Returns the version number for this version.
abstract  String getXmlNamespace()
          Returns the XML namespace in which the VOTable elements reside.
 String toString()
          Returns version number.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

V10

public static final VOTableVersion V10
VOTable 1.0.


V11

public static final VOTableVersion V11
VOTable 1.1.


V12

public static final VOTableVersion V12
VOTable 1.2.


V13

public static final VOTableVersion V13
VOTable 1.3.


DEFAULT_VERSION_STRING

public static final String DEFAULT_VERSION_STRING
Default VOTable version number which output will conform to if not otherwise specified ("1.3").

See Also:
Constant Field Values

VOTABLE_VERSION_PROP

public static final String VOTABLE_VERSION_PROP
System property name whose value gives the default VOTable version written by instances of this class if no version is given explicitly. The property is named "votable.version" and if it is not supplied the version defaults to the value of DEFAULT_VERSION_STRING (="1.3").

See Also:
Constant Field Values
Constructor Detail

VOTableVersion

protected VOTableVersion(String versionNumber)
Constructor.

Parameters:
versionNumber - the number (like "1.1") identifying this version
Method Detail

getVersionNumber

public String getVersionNumber()
Returns the version number for this version.

Returns:
version number (like "1.1")

getXmlNamespace

public abstract String getXmlNamespace()
Returns the XML namespace in which the VOTable elements reside.

Returns:
VOTable XML namespace, or null

getSchemaLocation

public abstract String getSchemaLocation()
Returns the URL of the VOTable schema corresponding to this version.

Returns:
VOTable schema, or null

getSchema

public abstract Schema getSchema()
Returns a schema which may be used to validate document instances of this VOTable version. Will return non-null iff getSchemaLocation() returns non-null.

Returns:
validation schema, or null

getDoctypeDeclaration

public abstract String getDoctypeDeclaration()
Returns the text of the DOCTYPE XML declaration for this version.

Returns:
doctype declaration, or null

getDtdUrl

public abstract URL getDtdUrl()
Returns a URL from which the DTD can be retrieved. This is not the canonical DTD url, but a pointer to a local resource. Will return non-null iff getDoctypeDeclaration() returns non-null.

Returns:
local URL from which the DTD can be retrieved, or null

toString

public String toString()
Returns version number.

Overrides:
toString in class Object

allowEmptyTd

public abstract boolean allowEmptyTd()
Indicates whether this version permits an empty TD element to represent a null value for all data types.

Returns:
true iff empty TD elements are always permitted

allowBinary2

public abstract boolean allowBinary2()
Indicates whether the BINARY2 serialization format is defined by this version.

Returns:
true iff BINARY2 is allowed

allowXtype

public abstract boolean allowXtype()
Indicates whether the xtype attribute is permitted on FIELD elements etc in this version.

Returns:
true iff xtype attribute is allowed

getKnownVersions

public static Map<String,VOTableVersion> getKnownVersions()
Returns a number->version map for all known versions. The map keys are version number strings like "1.1". The order of entries in this map is in ascending order of version number.

Returns:
version map

getDefaultVersion

public static VOTableVersion getDefaultVersion()
Returns the version instance used by default for output in this JVM. By default this is determined by the value of the DEFAULT_VERSION_STRING constant, but it can be overridden by use of the VOTABLE_VERSION_PROP ("votable.version") system property.

Returns:
default VOTable version for output

Copyright © 2004 CLRC: Central Laboratory of the Research Councils. All rights reserved.