org.jboss.byteman.rule.expression
Class StaticExpression

java.lang.Object
  extended by org.jboss.byteman.rule.RuleElement
      extended by org.jboss.byteman.rule.expression.Expression
          extended by org.jboss.byteman.rule.expression.AssignableExpression
              extended by org.jboss.byteman.rule.expression.StaticExpression

public class StaticExpression
extends AssignableExpression

an expression which identifies a static field reference


Field Summary
private  java.lang.reflect.Field field
           
private  int fieldIndex
           
private  java.lang.String fieldName
           
private  boolean isPublicField
           
private  Type ownerType
           
private  java.lang.String ownerTypeName
          the list of path components which may include package qualifiers, the class name, the field name and subordinate field references
 
Fields inherited from class org.jboss.byteman.rule.expression.Expression
charPos, line, rule, token, type
 
Constructor Summary
StaticExpression(Rule rule, Type type, ParseNode token, java.lang.String fieldName, java.lang.String ownerTypeName)
           
 
Method Summary
 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 possible
 void bindAssign()
          treat this as a normal bind because an update to a field reference does not update any bindings
 void compile(MethodVisitor mv, CompileContext compileContext)
           
 void compileAssign(MethodVisitor mv, CompileContext compileContext)
          compile an assignment to the referenced location using the value on the top of the Java stack.
 java.lang.Object interpret(HelperAdapter helper)
          evaluate the expression by interpreting the expression tree
 java.lang.Object interpretAssign(HelperAdapter helperAdapter, java.lang.Object value)
          execute an assignment to the referenced location by interpretation of the expression, using the object passed in this call
private  java.lang.reflect.Field lookupField(java.lang.Class<?> ownerClazz)
           
 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.
 void writeTo(java.io.StringWriter stringWriter)
           
 
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
 

Field Detail

ownerTypeName

private java.lang.String ownerTypeName
the list of path components which may include package qualifiers, the class name, the field name and subordinate field references


fieldName

private java.lang.String fieldName

field

private java.lang.reflect.Field field

ownerType

private Type ownerType

isPublicField

private boolean isPublicField

fieldIndex

private int fieldIndex
Constructor Detail

StaticExpression

public StaticExpression(Rule rule,
                        Type type,
                        ParseNode token,
                        java.lang.String fieldName,
                        java.lang.String ownerTypeName)
Method Detail

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 class Expression
Throws:
TypeException

bindAssign

public void bindAssign()
                throws TypeException
treat this as a normal bind because an update to a field reference does not update any bindings

Specified by:
bindAssign in class AssignableExpression
Throws:
TypeException

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 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 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(MethodVisitor mv,
                    CompileContext compileContext)
             throws CompileException
Specified by:
compile in class RuleElement
Throws:
CompileException

writeTo

public void writeTo(java.io.StringWriter stringWriter)
Specified by:
writeTo in class Expression

interpretAssign

public java.lang.Object interpretAssign(HelperAdapter helperAdapter,
                                        java.lang.Object value)
                                 throws ExecuteException
Description copied from class: AssignableExpression
execute an assignment to the referenced location by interpretation of the expression, using the object passed in this call

Specified by:
interpretAssign in class AssignableExpression
Parameters:
helperAdapter - 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

compileAssign

public void compileAssign(MethodVisitor mv,
                          CompileContext compileContext)
                   throws CompileException
Description copied from class: AssignableExpression
compile an assignment to the referenced location using the value on the top of the Java stack.

Specified by:
compileAssign in class AssignableExpression
Throws:
CompileException

lookupField

private java.lang.reflect.Field lookupField(java.lang.Class<?> ownerClazz)
                                     throws java.lang.NoSuchFieldException
Throws:
java.lang.NoSuchFieldException