/**
 * The WhileStatement class presents while statement node
 * of parse tree
 *
 * Jun 20, 1997 by mich
 * Sep 29, 1997 by mich
 * Oct 11, 1997 by 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 WhileStatement class presents while statement node
 * of parse tree
 *
 * @see io.devnulllabs.openjava.ptree.ParseTree
 * @see io.devnulllabs.openjava.ptree.NonLeaf
 * @see io.devnulllabs.openjava.ptree.Statement
 */
public class WhileStatement extends NonLeaf implements Statement, ParseTree {

    /**
     * Allocates a new object.
     *
     * @param  expr  the expression of the condition of this while
     *               statement.
     * @param  stmts  the statement list of the body oof this while
     *                statement.
     */
    public WhileStatement(Expression expr, StatementList stmts) {
        super();
        set((ParseTree) expr, (ParseTree) stmts);
    }

    WhileStatement() {
        super();
    }

    /**
     * Gets the condtion of this while statement.
     *
     * @return  the expression of the condtion.
     */
    public Expression getExpression() {
        return (Expression) elementAt(0);
    }

    /**
     * Sets the condtion of this while statement.
     *
     * @param  expr  the expression of the condtion to set.
     */
    public void setExpression(Expression expr) {
        setElementAt(expr, 0);
    }

    /**
     * Gets the body of this while statement.
     *
     * @return  the statement list of the body.
     */
    public StatementList getStatements() {
        return (StatementList) elementAt(1);
    }

    /**
     * Sets the body of this while statement.
     *
     * @param  stmts  the statement list of the body to set.
     */
    public void setStatements(StatementList stmts) {
        setElementAt(stmts, 1);
    }

    public void accept(ParseTreeVisitor v) throws ParseTreeException {
        v.visit(this);
    }

}