com.saxonica.codegen
Class LetExpressionCompiler

java.lang.Object
  com.saxonica.codegen.ExpressionCompiler
      com.saxonica.codegen.SequenceExpressionCompiler
          com.saxonica.codegen.LetExpressionCompiler

public class LetExpressionCompiler
extends SequenceExpressionCompiler

Compiles Java code to implement a Let expression

Constructor Summary

LetExpressionCompiler()

Method Summary

void	compileAsLoop(CompilerService compiler, Expression expr, LoopAction action) Compile an expression in the form of a loop.
void	compilePush(CompilerService compiler, Expression expr) Compile code to push the results of the expression to the current output receiver
String	compileToCharSequence(CompilerService compiler, Expression expr) Generate Java code to evaluate the expression as a CharSequence
String	compileToEffectiveBooleanValue(CompilerService compiler, Expression expr, ReturnAction options) Compile code to produce the effective boolean value of the expression
String	compileToItem(CompilerService compiler, Expression expr) Compile code to return the results of the expression as an Item.
String	compileToIterator(CompilerService compiler, Expression expr) Compile code to produce a SequenceIterator over the results of the expression
String	compileToValueRepresentation(CompilerService compiler, Expression expr) Generate Java code to evaluate the expression as a ValueRepresentation

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LetExpressionCompiler

public LetExpressionCompiler()

Method Detail

compileToIterator

public String compileToIterator(CompilerService compiler,
                                Expression expr)

Compile code to produce a SequenceIterator over the results of the expression

Specified by:

compileToIterator in class ExpressionCompiler

Parameters:

compiler - The CompilerService

expr - the LetExpression to be compiled

Returns:

the compiled Java expression

compileToValueRepresentation

public String compileToValueRepresentation(CompilerService compiler,
                                           Expression expr)

Description copied from class: ExpressionCompiler

Generate Java code to evaluate the expression as a ValueRepresentation

Overrides:

compileToValueRepresentation 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 ValueRepresentation, and which at run-time will hold the value of the expression

compileAsLoop

public void compileAsLoop(CompilerService compiler,
                          Expression expr,
                          LoopAction action)

Compile an expression in the form of a loop. Default implementation.

Overrides:

compileAsLoop in class ExpressionCompiler

Parameters:

compiler - the CompilerService

expr - the expression to be compiled

action - the action to be taken to process each item in the sequence returned by the expression

compilePush

public void compilePush(CompilerService compiler,
                        Expression expr)

Compile code to push the results of the expression to the current output receiver

Overrides:

compilePush in class SequenceExpressionCompiler

Parameters:

compiler - The CompilerService

expr - the LetExpression to be compiled

compileToItem

public String compileToItem(CompilerService compiler,
                            Expression expr)

Compile code to return the results of the expression as an Item. For use only when the cardinality is known to be zero-or-one

Overrides:

compileToItem in class SequenceExpressionCompiler

Parameters:

compiler - The CompilerService

expr - the LetExpression to be compiled

Returns:

the compiled Java expression

compileToEffectiveBooleanValue

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

Compile code to produce the effective boolean value of the expression

Overrides:

compileToEffectiveBooleanValue in class SequenceExpressionCompiler

Parameters:

compiler - The CompilerService

expr - the LetExpression to be compiled

options -

Returns:

the compiled Java expression

compileToCharSequence

public String compileToCharSequence(CompilerService compiler,
                                    Expression expr)

Description copied from class: ExpressionCompiler

Generate Java code to evaluate the expression as a CharSequence

Overrides:

compileToCharSequence in class ExpressionCompiler

Parameters:

compiler - the compiler service

expr - the XPath 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 XPath expression at run-time