Class PlusExpression
- java.lang.Object
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- org.jboss.byteman.rule.RuleElement
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- org.jboss.byteman.rule.expression.Expression
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- org.jboss.byteman.rule.expression.OperExpression
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- org.jboss.byteman.rule.expression.BinaryOperExpression
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- org.jboss.byteman.rule.expression.PlusExpression
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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
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Constructor Summary
Constructors Constructor Description PlusExpression(Rule rule, ParseNode token, Expression left, Expression right)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
compile(org.objectweb.asm.MethodVisitor mv, CompileContext compileContext)
java.lang.Object
interpret(HelperAdapter helper)
evaluate the expression by interpreting the expression treeType
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
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Methods inherited from class org.jboss.byteman.rule.expression.OperExpression
convertOper, writeTo
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Methods inherited from class org.jboss.byteman.rule.expression.Expression
getPos, getType
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Methods inherited from class org.jboss.byteman.rule.RuleElement
getBindings, getTypeGroup, rebox, toString
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Constructor Detail
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PlusExpression
public PlusExpression(Rule rule, ParseNode token, Expression left, Expression right)
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Method Detail
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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 classExpression
- 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.- Returns:
- the type of the expression
- Throws:
TypeException
- if a type check failure occurs
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interpret
public java.lang.Object interpret(HelperAdapter helper) throws ExecuteException
Description copied from class:Expression
evaluate the expression by interpreting the expression tree- Specified by:
interpret
in classExpression
- 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
- if an error occurs during execution
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compile
public void compile(org.objectweb.asm.MethodVisitor mv, CompileContext compileContext) throws CompileException
- Specified by:
compile
in classRuleElement
- Throws:
CompileException
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