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/*
* IfStatement.java 1.0
*
* Jun 20, 1997 mich
* Sep 29, 1997 bv
* Oct 11, 1997 mich
*
* @see io.devnulllabs.openjava.ptree.ParseTree
* @version 1.0 last updated: Oct 11, 1997
* @author Michiaki Tatsubori
*/
package io.devnulllabs.openjava.ptree;
import io.devnulllabs.openjava.ptree.util.ParseTreeVisitor;
/**
* The <code>IfStatement</code> class represents a if statement node
* of parse tree
*
* @see io.devnulllabs.openjava.ptree.ParseTree
* @see io.devnulllabs.openjava.ptree.NonLeaf
* @see io.devnulllabs.openjava.ptree.Statement
* @see io.devnulllabs.openjava.ptree.Expression
* @see io.devnulllabs.openjava.ptree.StatementList
*/
public class IfStatement extends NonLeaf implements Statement, ParseTree {
/**
* Constructs new IfStatement from prototype object
*
* @param expr the condition of this if statement.
* @param stmts the statement that is executed when expr is ture
* @param elsestmts the statement that is executed when expr is false.
* If there is no else part then statement list is
* empty.
*/
public IfStatement(
Expression expr,
StatementList stmts,
StatementList elsestmts) {
super();
if (stmts == null)
stmts = new StatementList();
if (elsestmts == null)
elsestmts = new StatementList();
set(expr, stmts, elsestmts);
}
/**
* Constructs new IfStatement from prototype object
*
* @param expr the condition of this if statement.
* @param stmts the statement that is executed when expr is ture
*/
public IfStatement(Expression expr, StatementList stmts) {
this(expr, stmts, null);
}
IfStatement() {
super();
}
/**
* Gets the condition of this if statement.
*
* @return the expression of the condition.
*/
public Expression getExpression() {
return (Expression) elementAt(0);
}
/**
* Sets the condition of this if statement.
*
* @param expr the expression of the condition.
*/
public void setExpression(Expression expr) {
setElementAt(expr, 0);
}
/**
* Gets the then part of this if statement.
*
* @return the statement list of the then part.
*/
public StatementList getStatements() {
return (StatementList) elementAt(1);
}
/**
* Sets the then part of this if statement.
*
* @param thenstmts the statement list of the then part.
*/
public void setStatements(StatementList thenstmts) {
setElementAt(thenstmts, 1);
}
/**
* Gets the else part of this if statement.
*
* @return the statement list of the else part.
*/
public StatementList getElseStatements() {
return (StatementList) elementAt(2);
}
/**
* Sets the else part of this if statement.
*
* @param elsestmts the statement list of the else part.
*/
public void setElseStatements(StatementList elsestmts) {
setElementAt(elsestmts, 2);
}
public void accept(ParseTreeVisitor v) throws ParseTreeException {
v.visit(this);
}
}
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