net.sf.saxon.functions
Class StandardFunction
java.lang.Object
|
+--net.sf.saxon.functions.StandardFunction
- public abstract class StandardFunction
- extends java.lang.Object
This class contains static data tables defining the properties of standard functions. "Standard functions"
here means the XPath 2.0 functions, the XSLT 2.0 functions, and a few selected extension functions
which need special recognition.
Nested Class Summary |
static class |
StandardFunction.Entry
An entry in the table describing the properties of a function |
Method Summary |
static void |
arg(StandardFunction.Entry e,
int a,
ItemType type,
int cardinality)
Add information to a function entry about the argument types of the function |
static StandardFunction.Entry |
getFunction(java.lang.String name)
Get the table entry for the function with a given name |
static StandardFunction.Entry |
makeEntry(java.lang.String name,
java.lang.Class implementationClass,
int opcode,
int minArguments,
int maxArguments,
ItemType itemType,
int cardinality)
Make a table entry describing the signature of a function, with a reference to the implementation class. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
SAME_AS_FIRST_ARGUMENT
protected static ItemType SAME_AS_FIRST_ARGUMENT
StandardFunction
public StandardFunction()
makeEntry
public static StandardFunction.Entry makeEntry(java.lang.String name,
java.lang.Class implementationClass,
int opcode,
int minArguments,
int maxArguments,
ItemType itemType,
int cardinality)
- Make a table entry describing the signature of a function, with a reference to the implementation class.
- Parameters:
name
- the function nameimplementationClass
- the class used to implement the functionopcode
- identifies the function when a single class implements several functionsminArguments
- the minimum number of arguments requiredmaxArguments
- the maximum number of arguments alloweditemType
- the item type of the result of the functioncardinality
- the cardinality of the result of the function
- Returns:
- the entry describing the function. The entry is incomplete, it does not yet contain information
about the function arguments.
arg
public static void arg(StandardFunction.Entry e,
int a,
ItemType type,
int cardinality)
- Add information to a function entry about the argument types of the function
- Parameters:
e
- the entry for the functiona
- the position of the argument, counting from zerotype
- the item type of the argumentcardinality
- the cardinality of the argument
getFunction
public static StandardFunction.Entry getFunction(java.lang.String name)
- Get the table entry for the function with a given name
- Parameters:
name
- the name of the function. This may be an unprefixed local-name for functions in the
system namespace, or may use the conventional prefix "saxon:" in the case of Saxon extension functions
that are specially recognized
- Returns:
- if the function name is known, an Entry containing information about the function. Otherwise,
null