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## com.saxonica.functions.extfn
Class Extensions

    java.lang.Object
      com.saxonica.functions.extfn.Extensions

    public class Extensions

extends Object

This class implements functions that are supplied as standard with SAXON, but which are not defined in the XSLT or XPath specifications.

To invoke these functions, use a function call of the form `prefix:name()` where name is the method name, and prefix maps to the URI `http://saxon.sf.net/`

Method Summary
`static DateTimeValue` | `adjustToCivilTime(XPathContext context, DateTimeValue date, String region)` Adjust a given date/time to a specified civil time zone, taking account of summer time (daylight savings time) changes, as obtained from the Java database of changes to daylight savings time.
`static byte[]` | `base64BinaryToOctets(Base64BinaryValue in)` Convert a base64Binary value to a sequence of integers representing the octets contained in the value
`static String` | `base64BinaryToString(XPathContext context, Base64BinaryValue in, String encoding)` Convert a base64Binary value to a String, assuming a particular encoding
`static int` | `columnNumber(NodeInfo node)` Return the column number of the specified node.
`static int` | `columnNumber(XPathContext c)` Return the column number of the context node.
`static QNameValue` | `currentModeName(XPathContext context)` Get the current mode.
`static BigDecimal` | `decimalDivide(BigDecimal arg1, BigDecimal arg2, int scale)` Perform decimal division to a user-specified precision
`static DocumentInfo` | `discardDocument(XPathContext context, DocumentInfo doc)` Remove a document from the document pool.
`static StringValue` | `generateId(NodeInfo node)` The function saxon:generate-id() is equivalent to the standard XSLT function generate-id().
`static Configuration` | `getConfiguration(XPathContext c)` Return the Configuration object
`static XPathContext` | `getContext(XPathContext c)` Return the XPathContext object
`static Controller` | `getController(XPathContext c)` Return the Controller object
`static String` | `getPseudoAttribute(XPathContext c, String name)` Get a pseudo-attribute of a processing instruction.
`static boolean` | `hasSameNodes(SequenceIterator p1, SequenceIterator p2)` Determine whether two node-sets contain the same sequences of nodes, compared by identity
`static byte[]` | `hexBinaryToOctets(HexBinaryValue in)` Convert a hexBinary value to a sequence of integers representing the octets contained in the value
`static String` | `hexBinaryToString(XPathContext context, HexBinaryValue in, String encoding)` Convert a hexBinary value to a String, assuming a particular encoding
`static BooleanValue` | `inSummerTime(XPathContext context, DateTimeValue date, String region)` Determine whether a given date/time is in summer time (daylight savings time) in a given region.
`static int` | `lineNumber(NodeInfo node)` Return the line number of the specified node.
`static int` | `lineNumber(XPathContext c)` Return the line number of the context node.
`static NodeInfo` | `namespaceNode(XPathContext context, String prefix, String uri)` Create a parentless namespace node.
`static Base64BinaryValue` | `octetsToBase64Binary(byte[] in)` Convert a sequence of integers in the range 0-255, representing a sequence of octets, to a base64Binary value
`static HexBinaryValue` | `octetsToHexBinary(byte[] in)` Convert a sequence of integers in the range 0-255, representing a sequence of octets, to a hexBinary value
`static String` | `path(XPathContext c)` Return an XPath expression that identifies the current node
`static String` | `path(XPathContext context, NodeInfo node)` Return an XPath expression that identifies a specified node
`static void` | `pauseTracing(XPathContext c)` Switch tracing off.
`static String` | `printStack(XPathContext c)` Return a string containing a diagnostic print of the current execution stack
`static void` | `resumeTracing(XPathContext c)` Resume tracing.
`static Base64BinaryValue` | `stringToBase64Binary(String in, String encoding)` Convert a string to a base64Binary value in a given encoding
`static HexBinaryValue` | `stringToHexBinary(String in, String encoding)` Convert a string to a hexBinary value in a given encoding
`static List` | `stringToUtf8(String in)` Get the UTF-8 encoding of a string
`static String` | `systemId(XPathContext c)` Return the system identifier of the context node
`static QNameValue` | `typeAnnotation(XPathContext context, Item item)` Display the value of the type annotation of a node or an atomic value
`static String[]` | `unparsedEntities(DocumentInfo doc)` Get a list of the names of the unparsed entities in a document
`static boolean` | `validCharacter(XPathContext c, int in)` Test whether a given integer is the codepoint of a valid XML character

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### pauseTracing

    public static void pauseTracing(XPathContext c)

  Switch tracing off. Only works if tracing was enabled at compile time.

  Parameters:
    `c` - the XPath dynamic context

### resumeTracing

    public static void resumeTracing(XPathContext c)

  Resume tracing. Only works if tracing was originally enabled but is currently paused.

  Parameters:
    `c` - the XPath dynamic context

### systemId

    public static String systemId(XPathContext c)
                           throws XPathException

  Return the system identifier of the context node

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    the system ID
  Throws:
    `XPathException`

### generateId

    public static StringValue generateId(NodeInfo node)

  The function saxon:generate-id() is equivalent to the standard XSLT function generate-id(). It is provided as an extension function to make it available in non-XSLT environments, for example in XQuery.

  Parameters:
    `node` - the node whose identifier is required
  Returns:
    as ASCII alphanumeric string that uniquely identifies this node

### lineNumber

    public static int lineNumber(XPathContext c)

  Return the line number of the context node.

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    the line number, or -1 if not available

### lineNumber

    public static int lineNumber(NodeInfo node)

  Return the line number of the specified node.

  Parameters:
    `node` - the node whose line number is required
  Returns:
    the line number of the node. This is only available if line numbering was switched on.

### columnNumber

    public static int columnNumber(XPathContext c)

  Return the column number of the context node. This is only available if line numbering has been enabled for the containing tree

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    the column number, or -1 if not available

### columnNumber

    public static int columnNumber(NodeInfo node)

  Return the column number of the specified node.

  Parameters:
    `node` - the node whose column number is required
  Returns:
    the column number of the node. This is only available if line numbering was switched on.

### discardDocument

    public static DocumentInfo discardDocument(XPathContext context,
                                               DocumentInfo doc)

  Remove a document from the document pool. The effect is that the document becomes eligible for garbage collection, allowing memory to be released when processing of the document has finished. The downside is that a subsequent call on document() with the same URI causes the document to be reloaded and reparsed, and the new nodes will have different node identity from the old.

  Parameters:
    `context` - the evaluation context (supplied implicitly by the call mechanism)
    `doc` - the document to be released from the document pool
  Returns:
    the document that was released. This allows a call such as select="saxon:discard-document(document('a.xml'))"

### hasSameNodes

    public static boolean hasSameNodes(SequenceIterator p1,
                                       SequenceIterator p2)
                                throws XPathException

  Determine whether two node-sets contain the same sequences of nodes, compared by identity

  Parameters:
    `p1` - The first node-set. The iterator must be correctly ordered.
    `p2` - The second node-set. The iterator must be correctly ordered.
  Returns:
    true if p1 and p2 contain the same set of nodes
  Throws:
    `XPathException`

### path

    public static String path(XPathContext context,
                              NodeInfo node)
                       throws XPathException

  Return an XPath expression that identifies a specified node

  Parameters:
    `node` - the node whose path is required
  Returns:
    a path expression giving a path from the root of the tree to the specified node
  Throws:
    `XPathException`

### path

    public static String path(XPathContext c)
                       throws XPathException

  Return an XPath expression that identifies the current node

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    a path expression giving a path from the root of the tree to the context node
  Throws:
    `XPathException`

### typeAnnotation

    public static QNameValue typeAnnotation(XPathContext context,
                                            Item item)

  Display the value of the type annotation of a node or an atomic value

  Parameters:
    `context` - the XPath dynamic context
    `item` - the node or atomic value whose type annotation is required
  Returns:
    the type annotation or type label as a QName

### getContext

    public static XPathContext getContext(XPathContext c)

  Return the XPathContext object

  Parameters:
    `c` - the context object
  Returns:
    the context object (this looks crazy, but it works given that the function is called from an XPath environment where the context is supplied as an implicit argument)

### getController

    public static Controller getController(XPathContext c)

  Return the Controller object

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    the Controller

### getConfiguration

    public static Configuration getConfiguration(XPathContext c)

  Return the Configuration object

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    the Saxon configuration

### printStack

    public static String printStack(XPathContext c)

  Return a string containing a diagnostic print of the current execution stack

  Parameters:
    `c` - the XPath dynamic context
  Returns:
    a diagnostic stack print

### getPseudoAttribute

    public static String getPseudoAttribute(XPathContext c,
                                            String name)
                                     throws XPathException

  Get a pseudo-attribute of a processing instruction. Return an empty string if the pseudo-attribute is not present. Character references and built-in entity references are expanded

  Parameters:
    `c` - the XPath dynamic context. The context item should be a processing instruction, though it doesn't matter if it isn't: the function will look at the string-value of the context item whatever it is.
    `name` - the name of the required pseudo-attribute
  Returns:
    the value of the pseudo-attribute if it is present
  Throws:
    `XPathException`

### decimalDivide

    public static BigDecimal decimalDivide(BigDecimal arg1,
                                           BigDecimal arg2,
                                           int scale)

  Perform decimal division to a user-specified precision

  Parameters:
    `arg1` - the numerator
    `arg2` - the denominator
    `scale` - the required number of digits in the result of the division
  Returns:
    the result of the division

### stringToUtf8

    public static List stringToUtf8(String in)

  Get the UTF-8 encoding of a string

  Parameters:
    `in` - the supplied string
  Returns:
    a sequence of integers, each in the range 0-255, representing the octets of the UTF-8 encoding of the given string

### octetsToBase64Binary

    public static Base64BinaryValue octetsToBase64Binary(byte[] in)

  Convert a sequence of integers in the range 0-255, representing a sequence of octets, to a base64Binary value

  Parameters:
    `in` - the input array of bytes (octets)
  Returns:
    the corresponding base64Binary value

### octetsToHexBinary

    public static HexBinaryValue octetsToHexBinary(byte[] in)

  Convert a sequence of integers in the range 0-255, representing a sequence of octets, to a hexBinary value

  Parameters:
    `in` - the input array of bytes (octets)
  Returns:
    the corresponding HexBinary value

### base64BinaryToOctets

    public static byte[] base64BinaryToOctets(Base64BinaryValue in)

  Convert a base64Binary value to a sequence of integers representing the octets contained in the value

  Parameters:
    `in` - the supplied base64Binary value
  Returns:
    the corresponding array of integers, representing the octet values

### hexBinaryToOctets

    public static byte[] hexBinaryToOctets(HexBinaryValue in)

  Convert a hexBinary value to a sequence of integers representing the octets contained in the value

  Parameters:
    `in` - the input hexBinary value
  Returns:
    the corresponding array of integers, representing the octet values

### base64BinaryToString

    public static String base64BinaryToString(XPathContext context,
                                              Base64BinaryValue in,
                                              String encoding)
                                       throws Exception

  Convert a base64Binary value to a String, assuming a particular encoding

  Parameters:
    `context` - the XPath dynamic context
    `in` - the supplied base64Binary value
    `encoding` - the character encoding
  Returns:
    the string that results from treating the base64binary value as a sequence of octets that encode a string in the given encoding
  Throws:
    `Exception`

### stringToBase64Binary

    public static Base64BinaryValue stringToBase64Binary(String in,
                                                         String encoding)
                                                  throws IOException

  Convert a string to a base64Binary value in a given encoding

  Parameters:
    `in` - the input string
    `encoding` - the desired encoding
  Returns:
    the base64Binary value that results from encoding the string as a sequence of octets in the given encoding.
  Throws:
    `IOException`

### hexBinaryToString

    public static String hexBinaryToString(XPathContext context,
                                           HexBinaryValue in,
                                           String encoding)
                                    throws Exception

  Convert a hexBinary value to a String, assuming a particular encoding

  Parameters:
    `context` - the XPath dynamic context
    `in` - the supplied hexBinary value
    `encoding` - the character encoding
  Returns:
    the string that results from treating the hexBinary value as a sequence of octets that encode a string in the given encoding
  Throws:
    `Exception`

### stringToHexBinary

    public static HexBinaryValue stringToHexBinary(String in,
                                                   String encoding)
                                            throws Exception

  Convert a string to a hexBinary value in a given encoding

  Parameters:
    `in` - the input string
    `encoding` - the desired encoding
  Returns:
    the hexBinary value that results from encoding the string as a sequence of octets in the given encoding.
  Throws:
    `Exception`

### validCharacter

    public static boolean validCharacter(XPathContext c,
                                         int in)

  Test whether a given integer is the codepoint of a valid XML character

  Parameters:
    `c` - the XPath dynamic context
    `in` - the character to be tested
  Returns:
    true if and only if the character is valid in (the relevant version of) XML

### namespaceNode

    public static NodeInfo namespaceNode(XPathContext context,
                                         String prefix,
                                         String uri)
                                  throws XPathException

  Create a parentless namespace node. This function is useful in XQuery when namespaces need to be created dynamically. The effect is the same as that of the xsl:namespace instruction in XSLT.

  Parameters:
    `context` - the dynamic evaluation context
    `prefix` - the name of the namespace node
    `uri` - the string value of the namespace node
  Returns:
    the newly constructed namespace node
  Throws:
    `XPathException`

### unparsedEntities

    public static String[] unparsedEntities(DocumentInfo doc)
                                     throws XPathException

  Get a list of the names of the unparsed entities in a document

  Parameters:
    `doc` - the document node of the document whose unparsed entities are required
  Returns:
    an iterator over a sequence of strings containing the names of the unparsed entities
  Throws:
    `XPathException`

### inSummerTime

    public static BooleanValue inSummerTime(XPathContext context,
                                            DateTimeValue date,
                                            String region)

  Determine whether a given date/time is in summer time (daylight savings time) in a given region. This relies on the Java database of changes to daylight savings time. Since summer time changes are set by civil authorities the information is not necessarily reliable when applied to dates in the future.

  Parameters:
    `context` - used to get the implicit timezone in the event that the supplied date/time has no timezone
    `date` - the date/time in question. This should preferably include a timezone offset. If it does not, the implicit timezone from the dynamic context is used.
    `region` - either the two-letter ISO country code, or an Olsen timezone name such as "America/New_York" or "Europe/Lisbon". If the country code denotes a country spanning several timezones, such as the US, then one of them is chosen arbitrarily.
  Returns:
    true if the date/time is known to be in summer time in the relevant country; false if it is known not to be in summer time; null if an empty sequence was supplied for the dateTime argument, or if no information is available.

### adjustToCivilTime

    public static DateTimeValue adjustToCivilTime(XPathContext context,
                                                  DateTimeValue date,
                                                  String region)

  Adjust a given date/time to a specified civil time zone, taking account of summer time (daylight savings time) changes, as obtained from the Java database of changes to daylight savings time. Since summer time changes are set by civil authorities the information is not necessarily reliable when applied to dates in the future.

  Parameters:
    `context` - used to get the implicit timezone in the event that the supplied date/time has no timezone
    `date` - the date/time in question. This should preferably include a timezone offset. If it does not, the implicit timezone from the dynamic context is used.
    `region` - An Olsen timezone name such as "America/New_York" or "Europe/Lisbon".
  Returns:
    The date/time adjusted to the timezone offset applicable to the place denoted by the Olsen timezone name. For example:

    `adjust-to-civil-time(xs:dateTime('2008-01-10T12:00:00Z', 'America/New_York')` returns `2008-01-10T07:00:00-05:00`

    `adjust-to-civil-time(xs:dateTime('2008-07-10T12:00:00Z', 'America/New_York')` returns `2008-07-10T08:00:00-04:00`

### currentModeName

    public static QNameValue currentModeName(XPathContext context)

  Get the current mode. Returms the name of the current mode if there is one. Returns null (delivered as an empty sequence) if there is no current mode or if the current mode is the unnamed (default) mode.

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