org.jboss.byteman.rule.expression

Class PlusExpression

java.lang.Object

org.jboss.byteman.rule.RuleElement

org.jboss.byteman.rule.expression.Expression

org.jboss.byteman.rule.expression.OperExpression

org.jboss.byteman.rule.expression.BinaryOperExpression

org.jboss.byteman.rule.expression.PlusExpression

public class PlusExpression
extends BinaryOperExpression

A plus operator expression which handles the case where we do not know the type of the first operand. this expression must be replaced by an expression with a known type during type checking

Field Summary

Fields inherited from class org.jboss.byteman.rule.expression.OperExpression

AND, ASSIGN, BAND, BINARY, BOR, BXOR, COND, DIV, EQ, GE, GT, LE, LSH, LT, MINUS, MOD, MUL, NE, NOT, oper, OR, PLUS, RSH, TERNARY, TWIDDLE, UMINUS, UNARY, URSH

Fields inherited from class org.jboss.byteman.rule.expression.Expression

charPos, line, rule, token, type

Constructor Summary

Constructors

Constructor and Description
PlusExpression(Rule rule, ParseNode token, Expression left, Expression right)

Method Summary

Methods

Modifier and Type	Method and Description
void	compile(org.objectweb.asm.MethodVisitor mv, CompileContext compileContext)
Object	interpret(HelperAdapter helper) evaluate the expression by interpreting the expression tree
Type	typeCheck(Type expected) ensure that all type references in the expression and its component expressions can be resolved, that the type of the expression is well-defined and that it is compatible with the type expected in the context in which it occurs.

Methods inherited from class org.jboss.byteman.rule.expression.BinaryOperExpression

bind, getOperand

Methods inherited from class org.jboss.byteman.rule.expression.OperExpression

convertOper, writeTo

Methods inherited from class org.jboss.byteman.rule.expression.Expression

getPos, getType

Methods inherited from class org.jboss.byteman.rule.RuleElement

compileBooleanConversion, compileBox, compileNumericConversion, compileObjectConversion, compilePrimitiveConversion, compileStringConversion, compileTypeConversion, compileUnbox, getBindings, getTypeGroup, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PlusExpression

public PlusExpression(Rule rule,
              ParseNode token,
              Expression left,
              Expression right)

Method Detail

typeCheck

public Type typeCheck(Type expected)
               throws TypeException

Description copied from class: Expression

ensure that all type references in the expression and its component expressions can be resolved, that the type of the expression is well-defined and that it is compatible with the type expected in the context in which it occurs.

Specified by:

typeCheck in class Expression

Parameters:

expected - the type expected for the expression in the contxet in which it occurs. this may be void but should not be undefined at the point where type checking is performed.

Throws:

TypeException

interpret

public Object interpret(HelperAdapter helper)
                 throws ExecuteException

Description copied from class: Expression

evaluate the expression by interpreting the expression tree

Specified by:

interpret in class Expression

Parameters:

helper - an execution context associated with the rule which contains a map of current bindings for rule variables and another map of their declared types both of which are indexed by variable name. This includes entries for the helper (name "-1"), the recipient if the trigger method is not static (name "0") and the trigger method arguments (names "1", ...)

Returns:

the result of evaluation as an Object

Throws:

ExecuteException

compile

public void compile(org.objectweb.asm.MethodVisitor mv,
           CompileContext compileContext)
             throws CompileException

Specified by:

compile in class RuleElement

Throws:

CompileException