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## com.saxonica.codegen
Class ToBooleanCompiler

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

Direct Known Subclasses:
  BooleanExpressionCompiler, CastableExpressionCompiler, CodepointEqualCompiler, CompareToIntegerConstantCompiler, ContainsCompiler, DeepEqualCompiler, DocAvailableCompiler, ExistenceCompiler, GeneralComparisonCompiler, IdentityComparisonCompiler, IndexedLookupExpressionCompiler, InstanceOfCompiler, IsLastExpressionCompiler, LangCompiler, MatchesCompiler, NilledCompiler, PatternMatchExpressionCompiler, PositionRangeCompiler, QuantifiedExpressionCompiler, SingletonComparisonCompiler, ValueComparisonCompiler

    public abstract class ToBooleanCompiler

extends ExpressionCompiler

Abstract class for compiling expressions that yield a boolean value and are generally used in a boolean context.

Constructor Summary
`ToBooleanCompiler()`

Method Summary
`void` | `compilePush(CompilerService compiler, Expression exp)` Generate Java code to execute the expression in push mode, that is, code to write events to the current output Receiver
`String` | `compileToCharSequence(CompilerService compiler, Expression expr)` Generate Java code to evaluate the expression as a CharSequence
`abstract String` | `compileToEffectiveBooleanValue(CompilerService compiler, Expression expr, ReturnAction options)` Generate Java code to evaluate the effective boolean value of the expression
`String` | `compileToItem(CompilerService compiler, Expression expr)` Generate Java code to evaluate the expression as an Item
`String` | `compileToIterator(CompilerService compiler, Expression expr)` Generate Java code to evaluate the expression as a SequenceIterator

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

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

Constructor Detail

### ToBooleanCompiler

    public ToBooleanCompiler()

Method Detail

### compilePush

    public void compilePush(CompilerService compiler,
                            Expression exp)

  Description copied from class: `ExpressionCompiler`
  Generate Java code to execute the expression in push mode, that is, code to write events to the current output Receiver

  Specified by:
    `compilePush` in class `ExpressionCompiler`
  Parameters:
    `compiler` - the compiler service
    `exp` - the expression to be compiled

### compileToIterator

    public String compileToIterator(CompilerService compiler,
                                    Expression expr)

  Description copied from class: `ExpressionCompiler`
  Generate Java code to evaluate the expression as a SequenceIterator

  Specified by:
    `compileToIterator` in class `ExpressionCompiler`
  Parameters:
    `compiler` - the compiler service
    `expr` - the expression to be compiled
  Returns:
    a simple Java expression (usually the name of a variable that has been declared) which will be of class `SequenceIterator`, and which at run-time will hold an iterator over the the value of the expression

### compileToItem

    public String compileToItem(CompilerService compiler,
                                Expression expr)

  Description copied from class: `ExpressionCompiler`
  Generate Java code to evaluate the expression as an Item

  Specified by:
    `compileToItem` in class `ExpressionCompiler`
  Parameters:
    `compiler` - the compiler service
    `expr` - the expression to be compiled
  Returns:
    a simple Java expression (usually the name of a variable that has been declared) which will be of class `Item`, and which will hold the value of the expression at run-time (or hold null, representing an empty sequence).

### compileToEffectiveBooleanValue

    public abstract String compileToEffectiveBooleanValue(CompilerService compiler,
                                                          Expression expr,
                                                          ReturnAction options)

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

  Specified by:
    `compileToEffectiveBooleanValue` in class `ExpressionCompiler`
  Parameters:
    `compiler` - the compiler service
    `expr` - the expression to be compiled
    `options` - indicates how the 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).

### compileToCharSequence

    public String compileToCharSequence(CompilerService compiler,
                                        Expression expr)

  Description copied from class: `ExpressionCompiler`
  Generate Java code to evaluate the expression as a CharSequence

  Specified by:
    `compileToCharSequence` in class `ExpressionCompiler`
  Parameters:
    `compiler` - the compiler service
    `expr` - the expression to be compiled
  Returns:
    a simple Java expression (usually the name of a variable that has been declared, or a string literal) which will be of class `CharSequence`, and which will hold the string value of the expression at run-time

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Copyright (C) Michael H. Kay. All rights reserved.