AxisExpressionCompiler

java.lang.Object
- com.saxonica.ee.bytecode.ExpressionCompiler
- - com.saxonica.ee.bytecode.ToIteratorCompiler
  - - com.saxonica.ee.bytecode.AxisExpressionCompiler

public class AxisExpressionCompiler
extends ToIteratorCompiler

Generate bytecode for evaluation of an AxisExpression

Constructor Summary

Constructors
Constructor Description

AxisExpressionCompiler()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`compileToIterator(CompilerService compiler, Expression expression)`	Generate bytecode to evaluate the expression as a `SequenceIterator` Precondition: none.
`static void`	`iterate(CompilerService compiler, int axis, NodeTest test)`	Generate code to iterate over the selected axis.

Methods inherited from class com.saxonica.ee.bytecode.ToIteratorCompiler
compileToBoolean, compileToItem, compileToPush

Methods inherited from class com.saxonica.ee.bytecode.ExpressionCompiler
allocateStatic, compileItemFromInt, compileToPrimitive, generateMethod, handleEmptyStringResult, printStackTop, verify, visitAnnotation, visitLineNumber

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

- Constructor Detail
  - AxisExpressionCompiler
```
public AxisExpressionCompiler()
```
- Method Detail
  - compileToIterator
```
public void compileToIterator(CompilerService compiler,
                              Expression expression)
                       throws CannotCompileException
```
    Description copied from class: ExpressionCompiler
    
    Generate bytecode to evaluate the expression as a SequenceIterator Precondition: none. Postcondition: at execution time, the stack contains a SequenceIterator representing the result of the expression
    
    Specified by:
    
    compileToIterator in class ExpressionCompiler
    
    Parameters:
    
    compiler - the compiler service
    
    expression - the expression to be compiled
    
    Throws:
    
    CannotCompileException - if the expression cannot be compiled to bytecode
  - iterate
```
public static void iterate(CompilerService compiler,
                           int axis,
                           NodeTest test)
```
    Generate code to iterate over the selected axis. Entry condition: the node forming the origin for the iteration is on the bytecode stack Exit condition: the iterator for the axisExpression is on the bytecode stack
    
    Parameters:
    
    compiler - the compiler service
    
    axis - the axis to be iterated over
    
    test - the node test to be satisfied; possibly null if all nodes are selected