NegateExpressionCompiler

java.lang.Object
- com.saxonica.ee.bytecode.ExpressionCompiler
- - com.saxonica.ee.bytecode.ToItemCompiler
  - - com.saxonica.ee.bytecode.NegateExpressionCompiler

```
public class NegateExpressionCompiler
extends ToItemCompiler
```
Generate bytecode for evaluation of a call to the substring() function

Constructor Summary

Constructors
Constructor Description

NegateExpressionCompiler()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`compileToItem(CompilerService compiler, Expression expression)`	Generate bytecode to evaluate the expression as an Item Precondition: none.

Methods inherited from class com.saxonica.ee.bytecode.ToItemCompiler
compileToBoolean, compileToIterator, compileToPush, returnZeroLengthStringIfNull

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
  - NegateExpressionCompiler
```
public NegateExpressionCompiler()
```
- Method Detail
  - compileToItem
```
public void compileToItem(CompilerService compiler,
                          Expression expression)
                   throws CannotCompileException
```
    Generate bytecode to evaluate the expression as an Item Precondition: none. Postcondition: at execution time, the stack contains either an item (the result of the expression), or null (representing an empty sequence).
    
    Specified by:
    
    compileToItem in class ExpressionCompiler
    
    Parameters:
    
    compiler - the compiler service
    
    expression - the expression to be compiled
    
    Throws:
    
    CannotCompileException - if the expression cannot be compiled to bytecode