org.teatrove.tea.parsetree
Class IfStatement

java.lang.Object
  org.teatrove.tea.parsetree.Node
      org.teatrove.tea.parsetree.Statement
          org.teatrove.tea.parsetree.IfStatement

All Implemented Interfaces:

Serializable, Cloneable

public class IfStatement
extends Statement

An IfStatement consists of a condition, a "then" part and an "else" part. Both the then and else parts are optional, but a parser should never create an IfStatement without a then part. An optimizer may detect that the then part never executes, and so eliminates it.

Author:

Brian S O'Neill

See Also:

Serialized Form

Constructor Summary

IfStatement(SourceInfo info, Expression condition, Block thenPart)

IfStatement(SourceInfo info, Expression condition, Block thenPart, Block elsePart)

Method Summary

Object	accept(NodeVisitor visitor) Every subclass of Node must override this method with the following: return visitor.visit(this).
Object	clone() Returns a clone of this Node and all its children.
Expression	getCondition()
Block	getElsePart()
Variable[]	getMergedVariables() Returns the variables that were commonly assigned in both the "then" and "else" parts of the if statement, were merged together and moved into the parent scope.
Block	getThenPart()
boolean	isBreak() Returns true if Statement 'breaks' during its execution.
boolean	isReturn() Returns true if Statement definitely returns from its method either from a return statement or a throw statement.
void	setCondition(Expression condition)
void	setElsePart(Block block)
void	setMergedVariables(Variable[] vars)
void	setThenPart(Block block)

Methods inherited from class org.teatrove.tea.parsetree.Node

getSourceInfo, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

IfStatement

public IfStatement(SourceInfo info,
                   Expression condition,
                   Block thenPart)

IfStatement

public IfStatement(SourceInfo info,
                   Expression condition,
                   Block thenPart,
                   Block elsePart)

Method Detail

accept

public Object accept(NodeVisitor visitor)

Description copied from class: Node

Every subclass of Node must override this method with the following: return visitor.visit(this).

Overrides:

accept in class Statement

Parameters:

visitor - A visitor of this Node

Returns:

Node The Node returned by the visitor

See Also:

NodeVisitor

clone

public Object clone()

Description copied from class: Node

Returns a clone of this Node and all its children. Immutable child objects are not necessarily cloned

Overrides:

clone in class Node

isReturn

public boolean isReturn()

Description copied from class: Statement

Returns true if Statement definitely returns from its method either from a return statement or a throw statement.

Overrides:

isReturn in class Statement

isBreak

public boolean isBreak()

Description copied from class: Statement

Returns true if Statement 'breaks' during its execution.

Overrides:

isBreak in class Statement

getCondition

public Expression getCondition()

getThenPart

public Block getThenPart()

Returns:

Null if no then part.

getElsePart

public Block getElsePart()

Returns:

Null if no else part.

setCondition

public void setCondition(Expression condition)

setThenPart

public void setThenPart(Block block)

setElsePart

public void setElsePart(Block block)

getMergedVariables

public Variable[] getMergedVariables()

Returns the variables that were commonly assigned in both the "then" and "else" parts of the if statement, were merged together and moved into the parent scope. Returns null if not set.

setMergedVariables

public void setMergedVariables(Variable[] vars)