net.sf.saxon.functions
public abstract class StandardFunction extends Object
Nested Class Summary | |
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static class | StandardFunction.Entry
An entry in the table describing the properties of a function |
Field Summary | |
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protected static ItemType | SAME_AS_FIRST_ARGUMENT |
Method Summary | |
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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(String name, int arity)
Get the table entry for the function with a given name |
static StandardFunction.Entry | makeEntry(String name, 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: e the entry for the function a the position of the argument, counting from zero type the item type of the argument cardinality the cardinality of the argument
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
Parameters: name the function name implementationClass the class used to implement the function opcode identifies the function when a single class implements several functions minArguments the minimum number of arguments required maxArguments the maximum number of arguments allowed itemType the item type of the result of the function cardinality 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.