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## com.saxonica.codegen
Class ExistenceCompiler

    java.lang.Object
      com.saxonica.codegen.ExpressionCompiler
          com.saxonica.codegen.ToBooleanCompiler
              com.saxonica.codegen.ExistenceCompiler

    public class ExistenceCompiler

extends ToBooleanCompiler

Generate Java code for an exists() or empty() function call

Constructor Summary
`ExistenceCompiler()`

Method Summary
`java.lang.String` | `compileToEffectiveBooleanValue(CompilerService compiler, Expression expr, ReturnAction result)` Generate Java code to evaluate the effective boolean value of the expression

Methods inherited from class com.saxonica.codegen.ToBooleanCompiler
`compilePush, compileToCharSequence, compileToItem, compileToIterator`

Methods inherited from class com.saxonica.codegen.ExpressionCompiler
`compileAsLoop, compileToValueRepresentation`

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

Constructor Detail

### ExistenceCompiler

    public ExistenceCompiler()

Method Detail

### compileToEffectiveBooleanValue

    public java.lang.String compileToEffectiveBooleanValue(CompilerService compiler,
                                                           Expression expr,
                                                           ReturnAction result)

  Description copied from class: `ExpressionCompiler`
  Generate Java code to evaluate the effective boolean value of the expression

  Specified by:
    `compileToEffectiveBooleanValue` in class `ToBooleanCompiler`
  Parameters:
    `compiler` - the compiler service
    `expr` - the XPath expression to be compiled
    `result` - indicates how the boolean result is to be returned
  Returns:
    the result depends on the supplied value of the options argument. If options is a JavaDeclaration, the code must declare a Java variable and return the name of this variable. If options is a JavaAssignment, the code must assign the value to an existing Java variable. If options is a Return, the code must generate a return statement that returns the value of the boolean (in which case the result of this method is null).

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Copyright (c) Saxonica Limited. All rights reserved.