openjava.ptree
Class InstanceofExpression

java.lang.Object
  |
  +--openjava.ptree.ParseTreeObject
        |
        +--openjava.ptree.NonLeaf
              |
              +--openjava.ptree.InstanceofExpression

All Implemented Interfaces:

Cloneable, Expression, ParseTree, VariableInitializer

public class InstanceofExpression

extends NonLeaf

implements Expression

The InstanceofExpression represents a call to the instanceof operator.

For example:

     obj instanceof Object
 

If the operator in the expression of the left operand has weak unity, this automatically produces the code in which the left operand is enclosed by parentheses.
In the case the left is obj = obj2 and the right is String, this produces the code :

     (obj = obj2) instanceof String
 

See Also:

Expression, TypeName

Field Summary

Fields inherited from class openjava.ptree.NonLeaf

Fields inherited from class openjava.ptree.ParseTreeObject

debugFlag, debugLevel, LN, out, writerStack

Constructor Summary

(package private)	InstanceofExpression()
	InstanceofExpression(Expression lexp, TypeName tspec) Allocates a new object.

Method Summary

void	accept(ParseTreeVisitor v) Accepts a ParseTreeVisitor object as the role of a Visitor in the Visitor pattern, as the role of an Element in the Visitor pattern.
Expression	getExpression() Gets the expression of the left operand to be tested in this expression.
OJClass	getType(Environment env)
TypeName	getTypeSpecifier() Gets the type specifier of the right operand to be tested in this expression.
private boolean	needsLeftPar(Expression lexpr)
void	setLeft(Expression lexpr) Sets the expression of the left operand to be tested in this expression.
void	setTypeSpecifier(TypeName tspec) Sets the type specifier of the right operand to be tested in this expression.
void	writeCode() Writes the code this parse-tree presents for.

Methods inherited from class openjava.ptree.NonLeaf

childrenAccept, childrenAreEqual, elementAt, equals, getComment, getContents, getLength, getRowType, makeRecursiveCopy, replaceChildWith, set, set, set, set, set, set, set, set, set, setComment, setElementAt

Methods inherited from class openjava.ptree.ParseTreeObject

clone, eq, eq, equal, flushPrintWriter, getDebugFlag, getNest, getObjectID, getParent, getPrintWriter, getTab, hashCode, lastObjectID, makeCopy, popNest, popPrintWriter, pushNest, pushPrintWriter, replace, setDebugFlag, setDebugLevel, setNest, setParent, setPrintStream, setTab, toFlattenString, toString, writeDebug, writeDebugL, writeDebugLln, writeDebugln, writeDebugLR, writeDebugR, writeDebugRln, writeTab

Methods inherited from class java.lang.Object

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

Methods inherited from interface openjava.ptree.Expression

getRowType

Methods inherited from interface openjava.ptree.ParseTree

childrenAccept, eq, equals, getObjectID, makeCopy, makeRecursiveCopy, replace, toFlattenString, toString

Constructor Detail

InstanceofExpression

public InstanceofExpression(Expression lexp,
                            TypeName tspec)

Allocates a new object.

Parameters:

lexp - the expression to test.

tspec - the typespecifier.

InstanceofExpression

InstanceofExpression()

Method Detail

writeCode

public void writeCode()

Description copied from class: NonLeaf

Writes the code this parse-tree presents for.

Specified by:

writeCode in interface ParseTree

Overrides:

writeCode in class NonLeaf

needsLeftPar

private final boolean needsLeftPar(Expression lexpr)

getExpression

public Expression getExpression()

Gets the expression of the left operand to be tested in this expression.

Returns:

the left expression.

setLeft

public void setLeft(Expression lexpr)

Sets the expression of the left operand to be tested in this expression.

Parameters:

lexpr - the left expression to set.

getTypeSpecifier

public TypeName getTypeSpecifier()

Gets the type specifier of the right operand to be tested in this expression.

Returns:

the type specifier.

setTypeSpecifier

public void setTypeSpecifier(TypeName tspec)

Sets the type specifier of the right operand to be tested in this expression.

Parameters:

tspec - the type specifier to set.

getType

public OJClass getType(Environment env)
                throws Exception

Specified by:

getType in interface Expression

Exception

accept

public void accept(ParseTreeVisitor v)
            throws ParseTreeException

Description copied from interface: ParseTree

Accepts a ParseTreeVisitor object as the role of a Visitor in the Visitor pattern, as the role of an Element in the Visitor pattern.

This invoke an appropriate visit() method on the accepted visitor.

Specified by:

accept in interface ParseTree

Specified by:

accept in class ParseTreeObject

Parameters:

v - a visitor

ParseTreeException