at.davinci.util
Class ParamReader

java.lang.Object
  java.io.InputStream
      java.io.ByteArrayInputStream
          at.davinci.util.ClassReader
              at.davinci.util.ParamReader

All Implemented Interfaces:

java.io.Closeable

public class ParamReader
extends ClassReader

This is the class file reader for obtaining the parameter names for declared methods in a class. The class must have debugging attributes for us to obtain this information.

This does not work for inherited methods. To obtain parameter names for inherited methods, you must use a paramReader for the class that originally declared the method.

don't get tricky, it's the bare minimum. Instances of this class are not threadsafe -- don't share them.

Author:

Edwin Smith, Macromedia

Constructor Summary

ParamReader(byte[] b)
process the given class bytes directly.

ParamReader(java.lang.Class c)
process a class file, given it's class.

Method Summary

java.lang.String[]	getParameterNames(java.lang.reflect.Constructor ctor) return the names of the declared parameters for the given constructor.
java.lang.String[]	getParameterNames(java.lang.reflect.Method method) return the names of the declared parameters for the given method.
void	readCode() read a code attribute
void	readLocalVariableTable() this is invoked when a LocalVariableTable attribute is encountered.

Methods inherited from class at.davinci.util.ClassReader

getBytes

Methods inherited from class java.io.ByteArrayInputStream

available, close, mark, markSupported, read, read, reset, skip

Methods inherited from class java.io.InputStream

read

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ParamReader

public ParamReader(java.lang.Class c)
            throws java.io.IOException

process a class file, given it's class. We'll use the defining classloader to locate the bytecode.

Parameters:

c -

Throws:

java.io.IOException

ParamReader

public ParamReader(byte[] b)
            throws java.io.IOException

process the given class bytes directly.

Parameters:

b -

Throws:

java.io.IOException

Method Detail

readCode

public void readCode()
              throws java.io.IOException

Description copied from class: ClassReader

read a code attribute

Overrides:

readCode in class ClassReader

Throws:

java.io.IOException

getParameterNames

public java.lang.String[] getParameterNames(java.lang.reflect.Constructor ctor)

return the names of the declared parameters for the given constructor. If we cannot determine the names, return null. The returned array will have one name per parameter. The length of the array will be the same as the length of the Class[] array returned by Constructor.getParameterTypes().

Parameters:

ctor -

Returns:

String[] array of names, one per parameter, or null

getParameterNames

public java.lang.String[] getParameterNames(java.lang.reflect.Method method)

return the names of the declared parameters for the given method. If we cannot determine the names, return null. The returned array will have one name per parameter. The length of the array will be the same as the length of the Class[] array returned by Method.getParameterTypes().

Parameters:

method -

Returns:

String[] array of names, one per parameter, or null

readLocalVariableTable

public void readLocalVariableTable()
                            throws java.io.IOException

this is invoked when a LocalVariableTable attribute is encountered.

Throws:

java.io.IOException