com.saxonica.functions.map
Class MapSize

java.lang.Object
  extended by net.sf.saxon.lib.ExtensionFunctionDefinition
      extended by com.saxonica.functions.map.MapSize
All Implemented Interfaces:
Serializable

public class MapSize
extends ExtensionFunctionDefinition

Implementation of the extension function map:entry(key, value) => Map

See Also:
Serialized Form

Constructor Summary
MapSize()
           
 
Method Summary
 SequenceType[] getArgumentTypes()
          Get the required types for the arguments of this function.
 StructuredQName getFunctionQName()
          Get the name of the function, as a QName.
 int getMinimumNumberOfArguments()
          Get the minimum number of arguments required by the function
 SequenceType getResultType(SequenceType[] suppliedArgumentTypes)
          Get the type of the result of the function
 ExtensionFunctionCall makeCallExpression()
          Create a call on this function.
 boolean trustResultType()
          Ask whether the result actually returned by the function can be trusted, or whether it should be checked against the declared type.
 
Methods inherited from class net.sf.saxon.lib.ExtensionFunctionDefinition
dependsOnFocus, getMaximumNumberOfArguments, hasSideEffects
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

MapSize

public MapSize()
Method Detail

getFunctionQName

public StructuredQName getFunctionQName()
Get the name of the function, as a QName.

This method must be implemented in all subclasses

Specified by:
getFunctionQName in class ExtensionFunctionDefinition
Returns:
the function name

getMinimumNumberOfArguments

public int getMinimumNumberOfArguments()
Get the minimum number of arguments required by the function

This method must be implemented in all subclasses

Overrides:
getMinimumNumberOfArguments in class ExtensionFunctionDefinition
Returns:
the minimum number of arguments that must be supplied in a call to this function

getArgumentTypes

public SequenceType[] getArgumentTypes()
Get the required types for the arguments of this function.

This method must be implemented in all subtypes.

Specified by:
getArgumentTypes in class ExtensionFunctionDefinition
Returns:
the required types of the arguments, as defined by the function signature. Normally this should be an array of size ExtensionFunctionDefinition.getMaximumNumberOfArguments(); however for functions that allow a variable number of arguments, the array can be smaller than this, with the last entry in the array providing the required type for all the remaining arguments.

getResultType

public SequenceType getResultType(SequenceType[] suppliedArgumentTypes)
Get the type of the result of the function

This method must be implemented in all subtypes.

Specified by:
getResultType in class ExtensionFunctionDefinition
Parameters:
suppliedArgumentTypes - the static types of the supplied arguments to the function. This is provided so that a more precise result type can be returned in the common case where the type of the result depends on the types of the arguments.
Returns:
the return type of the function, as defined by its function signature

trustResultType

public boolean trustResultType()
Ask whether the result actually returned by the function can be trusted, or whether it should be checked against the declared type.

Overrides:
trustResultType in class ExtensionFunctionDefinition
Returns:
true if the function implementation warrants that the value it returns will be an instance of the declared result type. The default value is false, in which case the result will be checked at run-time to ensure that it conforms to the declared type. If the value true is returned, but the function returns a value of the wrong type, the consequences are unpredictable.

makeCallExpression

public ExtensionFunctionCall makeCallExpression()
Create a call on this function. This method is called by the compiler when it identifies a function call that calls this function.

Specified by:
makeCallExpression in class ExtensionFunctionDefinition
Returns:
an expression representing a call of this extension function


Copyright (c) 2004-2011 Saxonica Limited. All rights reserved.