Class MethodExpression
- 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.MethodExpression
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public class MethodExpression extends Expression
an expression which identifies a method invocation
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Field Summary
Fields Modifier and Type Field Description static Method
setTriggeringMethod
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Constructor Summary
Constructors Constructor Description MethodExpression(Rule rule, Type type, ParseNode token, Expression recipient, List<Expression> arguments, String[] pathList)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Method
bestMatchCandidate(List<Method> candidates, Type expected)
return the method whose signature is the best fit for the call argument types.void
bind()
verify that variables mentioned in this expression are actually available in the supplied bindings list and infer/validate the type of this expression or its subexpressions where possiblevoid
compile(org.objectweb.asm.MethodVisitor mv, CompileContext compileContext)
Class
getCandidateArgClass(List<Method> candidates, int argIdx)
String
getPath(int len)
int
getPathCount(String name)
Object
interpret(HelperAdapter helper)
evaluate the expression by interpreting the expression treeList<Method>
pruneCandidates(List<Method> candidates, int argIdx, Class argClazz)
prune the candidates list removing all methods whose parameter at index argIdx cannot be assigned to class argClazzType
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.void
writeTo(StringWriter stringWriter)
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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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Field Detail
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setTriggeringMethod
public static Method setTriggeringMethod
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Constructor Detail
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MethodExpression
public MethodExpression(Rule rule, Type type, ParseNode token, Expression recipient, List<Expression> arguments, String[] pathList)
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Method Detail
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bind
public void bind() throws TypeException
verify that variables mentioned in this expression are actually available in the supplied bindings list and infer/validate the type of this expression or its subexpressions where possible- Specified by:
bind
in classExpression
- Throws:
TypeException
- if any variable is missing or has the wrong type
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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 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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pruneCandidates
public List<Method> pruneCandidates(List<Method> candidates, int argIdx, Class argClazz)
prune the candidates list removing all methods whose parameter at index argIdx cannot be assigned to class argClazz- Parameters:
candidates
- candidate matching methodsargIdx
- index of arg curently being checkedargClazz
- class of arg curently being checked- Returns:
- the pruned method list
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bestMatchCandidate
public Method bestMatchCandidate(List<Method> candidates, Type expected)
return the method whose signature is the best fit for the call argument types. the selection is made by counting the number of cases where the argument type matches the parameter type exactly and then the number of cases where the argument type matches the parameter type without the need for type coercion (i.e. the parameter tyoe is a supertype of the argument type)- Parameters:
candidates
- a list of methods all of whose signatures are assignable from theexpected
- an expected type which may or may not constrain the method return type- Returns:
- the best match if there is a unique one otherwise NULL
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getPath
public String getPath(int len)
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getPathCount
public int getPathCount(String name)
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writeTo
public void writeTo(StringWriter stringWriter)
- Specified by:
writeTo
in classExpression
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