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/*
* InstanceofExpression.java 1.0
*
*
* Jun 20, 1997 by mich
* 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>InstanceofExpression</code> represents
* the expression like :
* <br><blockquote><pre>
* obj instanceof Object
* </pre></blockquote><br>
* If the operator in the expression of the left operand has week unity,
* this automatically produces the code in which the left operand
* is enclosed by parenthesises.
* <br>
* In the case the left is <code>obj = obj2</code> and
* the right is <code>String</code>,
* this produces the code :
* <br><blockquote><pre>
* (obj = obj2) instanceof String
* </pre></blockquote><br>
*
* @see io.devnulllabs.openjava.ptree.Expression
* @see io.devnulllabs.openjava.ptree.TypeName
*/
public class InstanceofExpression extends NonLeaf implements Expression {
/**
* Allocates a new object.
*
* @param lexp the expression to test.
* @param tspec the typespecifier.
*/
public InstanceofExpression(Expression lexp, TypeName tspec) {
super();
set(lexp, tspec);
}
InstanceofExpression() {
super();
}
private final boolean needsLeftPar(Expression lexpr) {
if (lexpr instanceof AssignmentExpression
|| lexpr instanceof ConditionalExpression) {
return true;
}
/* this is too strict for + */
if (lexpr instanceof BinaryExpression) {
return true;
}
return false;
}
/**
* Gets the expression of the left operand to be tested
* in this expression.
*
* @return the left expression.
*/
public Expression getExpression() {
return (Expression) elementAt(0);
}
/**
* Sets the expression of the left operand to be tested
* in this expression.
*
* @param lexpr the left expression to set.
*/
public void setLeft(Expression lexpr) {
setElementAt(lexpr, 0);
}
/**
* Gets the type specifier of the right operand to be tested
* in this expression.
*
* @return the type specifier.
*/
public TypeName getTypeSpecifier() {
return (TypeName) elementAt(1);
}
/**
* Sets the type specifier of the right operand to be tested
* in this expression.
*
* @param tspec the type specifier to set.
*/
public void setTypeSpecifier(TypeName tspec) {
setElementAt(tspec, 1);
}
public OJClass getType(Environment env) throws Exception {
return OJClass.forClass(boolean.class);
}
public void accept(ParseTreeVisitor v) throws ParseTreeException {
v.visit(this);
}
}
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