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/*
* CastExpression.java 1.0
*
*
* Jun 20, 1997 by mich
* Sep 29, 1997 by bv
* Oct 10, 1997 by mich
*
* @see io.devnulllabs.openjava.ptree.ParseTree
* @version 1.0 last updated: Oct 10, 1997
* @author Michiaki Tatsubori
*/
package io.devnulllabs.openjava.ptree;
import io.devnulllabs.openjava.mop.Environment;
import io.devnulllabs.openjava.mop.OJClass;
import io.devnulllabs.openjava.ptree.util.ParseTreeVisitor;
/**
* The <code>CastExpression</code> class represents
* a cast expression of parse tree.
* <br>
* If the operator in the expression of the right operand has week unity,
* this automatically produces the code in which the right operand
* is enclosed by parenthesises.
* <br>
* In the case the caster is <code>int</code> and
* the right operand to be casted is <code>p + q</code>,
* this produces the code :
* <br><blockquote><pre>
* (int) (p + q)
* </pre></blockquote><br>
*
* @see io.devnulllabs.openjava.ptree.NonLeaf
* @see io.devnulllabs.openjava.ptree.Expression
* @see io.devnulllabs.openjava.ptree.TypeName
*/
public class CastExpression extends NonLeaf implements Expression {
/**
* Allocates a new object.
*
* @param ts the type specifier to cast in this expression.
* @param expr the expression to be casted in this expression.
*/
public CastExpression(TypeName ts, Expression expr) {
super();
set((ParseTree) ts, (ParseTree) expr);
}
public CastExpression(OJClass type, Expression expr) {
this(TypeName.forOJClass(type), expr);
}
CastExpression() {
super();
}
/**
* Gets the type specifier to cast in this expression.
*
* @return the type specifier.
*/
public TypeName getTypeSpecifier() {
return (TypeName) elementAt(0);
}
/**
* Sets the type specifier to cast in this expression.
*
* @param tspec the type specifier.
*/
public void setTypeSpecifier(TypeName tspec) {
setElementAt(tspec, 0);
}
/**
* Gets the expression of the operand to be casted in this expression.
*
* @return the expression.
*/
public Expression getExpression() {
return (Expression) elementAt(1);
}
/**
* Sets the expression of the operand to be casted in this expression.
*
* @param expr the expression.
*/
public void setExpression(Expression expr) {
setElementAt(expr, 1);
}
public void accept(ParseTreeVisitor v) throws ParseTreeException {
v.visit(this);
}
public OJClass getType(Environment env) throws Exception {
String qname = env.toQualifiedName(getTypeSpecifier().toString());
return env.lookupClass(qname);
}
}
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