Class IntegratedFunctionCompiler

  extended by com.saxonica.codegen.IntegratedFunctionCompiler
Direct Known Subclasses:
IsWholeNumberCompiler, ItemAtCompiler

public abstract class IntegratedFunctionCompiler
extends Object

This abstract class represents the compiler (that is, Java code generator) for an integrated extension function appearing on the expression tree

Constructor Summary
Method Summary
abstract  String compile(CompilerService compiler, ExtensionFunctionCall function, Expression[] arguments, String[] variables)
          Generate Java code to evaluate the expression as a SequenceIterator
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public IntegratedFunctionCompiler()
Method Detail


public abstract String compile(CompilerService compiler,
                               ExtensionFunctionCall function,
                               Expression[] arguments,
                               String[] variables)
Generate Java code to evaluate the expression as a SequenceIterator

compiler - the compiler service
function - the integrated function call to be compiled
arguments - the arguments supplied to the function call
variables - an array of strings each being the Java name of a variable that holds the value of the corresponding argument, either as a SequenceIterator in the case of an argument that allows more than one value, or as an Item if the argument only allows a singleton
a simple Java expression (usually the name of a variable that has been declared). If the result type of the function is boolean, this variable will hold a Java boolean. If the result type is an optional item, it will hold an Item (using null to represent an empty sequence). If it is any other type, the variable will hold a SequenceIterator, In each case the Java variable will at run-time hold the value of the XPath expression

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