Package org.apache.sling.scripting.sightly.impl.compiler.optimization

Class UnusedVariableRemoval

java.lang.Object

org.apache.sling.scripting.sightly.impl.compiler.visitor.UniformVisitor

org.apache.sling.scripting.sightly.impl.compiler.visitor.TrackingVisitor<org.apache.sling.scripting.sightly.impl.compiler.optimization.UnusedVariableRemoval.VariableActivity>

org.apache.sling.scripting.sightly.impl.compiler.optimization.UnusedVariableRemoval

All Implemented Interfaces:

CommandVisitor, EmitterVisitor

public final class UnusedVariableRemoval
extends TrackingVisitor<org.apache.sling.scripting.sightly.impl.compiler.optimization.UnusedVariableRemoval.VariableActivity>
implements EmitterVisitor

This optimization removes variables which are bound but never used in the command stream.

Field Summary

Fields

Modifier and Type	Field	Description
static StreamTransformer	TRANSFORMER

Fields inherited from class org.apache.sling.scripting.sightly.impl.compiler.visitor.TrackingVisitor

tracker

Method Summary

Modifier and Type	Method	Description
protected org.apache.sling.scripting.sightly.impl.compiler.optimization.UnusedVariableRemoval.VariableActivity	assignDefault(Command command)
PushStream	getOutputStream()	Get the output stream
protected void	onCommand(Command command)
void	visit(VariableBinding.End variableBindingEnd)	Process a VariableBinding.End command.
void	visit(VariableBinding.Start variableBindingStart)	Process a VariableBinding.Start command.

Methods inherited from class org.apache.sling.scripting.sightly.impl.compiler.visitor.TrackingVisitor

visit, visit

Methods inherited from class org.apache.sling.scripting.sightly.impl.compiler.visitor.UniformVisitor

visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.sling.scripting.sightly.compiler.commands.CommandVisitor

visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Field Detail

TRANSFORMER

public static final StreamTransformer TRANSFORMER

Method Detail

getOutputStream

public PushStream getOutputStream()

Description copied from interface: EmitterVisitor

Get the output stream

Specified by:

getOutputStream in interface EmitterVisitor

Returns:

the output stream of this visitor

visit

public void visit(VariableBinding.Start variableBindingStart)

Description copied from interface: CommandVisitor

Process a VariableBinding.Start command.

Specified by:

visit in interface CommandVisitor

Overrides:

visit in class TrackingVisitor<org.apache.sling.scripting.sightly.impl.compiler.optimization.UnusedVariableRemoval.VariableActivity>

Parameters:

variableBindingStart - the command

visit

public void visit(VariableBinding.End variableBindingEnd)

Description copied from interface: CommandVisitor

Process a VariableBinding.End command.

Specified by:

visit in interface CommandVisitor

Overrides:

visit in class TrackingVisitor<org.apache.sling.scripting.sightly.impl.compiler.optimization.UnusedVariableRemoval.VariableActivity>

Parameters:

variableBindingEnd - the command

assignDefault

protected org.apache.sling.scripting.sightly.impl.compiler.optimization.UnusedVariableRemoval.VariableActivity assignDefault(Command command)

Specified by:

assignDefault in class TrackingVisitor<org.apache.sling.scripting.sightly.impl.compiler.optimization.UnusedVariableRemoval.VariableActivity>

onCommand

protected void onCommand(Command command)

Specified by:

onCommand in class UniformVisitor