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org.apache.cxf.common.util
Class ClassReader

java.lang.Object
  extended by java.io.InputStream
      extended by java.io.ByteArrayInputStream
          extended by org.apache.cxf.common.util.ClassReader
All Implemented Interfaces:
Closeable
Direct Known Subclasses:
ParamReader
public class ClassReader
extends ByteArrayInputStream

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

Field Summary
 
Fields inherited from class java.io.ByteArrayInputStream
buf, count, mark, pos
 
Constructor Summary
protected ClassReader(byte[] buf, Map<String,Method> attrMethods)
           
 
Method Summary
protected static Map<String,Method> findAttributeReaders(Class<?> c)
           
protected static byte[] getBytes(Class<?> c)
          load the bytecode for a given class, by using the class's defining classloader and assuming that for a class named P.C, the bytecodes are in a resource named /P/C.class.
protected static String getSignature(Member method, Class<?>[] paramTypes)
           
protected  void readAttributes()
          read an attributes array.
 void readCode()
          read a code attribute
protected  void readCpool()
           
protected  int readInt()
           
protected  int readShort()
           
protected  Class<?> resolveClass(int i)
           
protected  Field resolveField(int i)
           
protected  Member resolveMethod(int index)
           
protected  org.apache.cxf.common.util.ClassReader.NameAndType resolveNameAndType(int i)
           
protected  String resolveUtf8(int i)
           
protected  void skipAttributes()
           
protected  void skipFully(int n)
          skip n bytes in the input stream.
 
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
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ClassReader

protected ClassReader(byte[] buf,
                      Map<String,Method> attrMethods)
Method Detail

getBytes

protected static byte[] getBytes(Class<?> c)
                          throws IOException
load the bytecode for a given class, by using the class's defining classloader and assuming that for a class named P.C, the bytecodes are in a resource named /P/C.class.

Parameters:
c - the class of interest
Returns:
a byte array containing the bytecode
Throws:
IOException

findAttributeReaders

protected static Map<String,Method> findAttributeReaders(Class<?> c)

getSignature

protected static String getSignature(Member method,
                                     Class<?>[] paramTypes)

readShort

protected final int readShort()
Returns:
the next unsigned 16 bit value

readInt

protected final int readInt()
Returns:
the next signed 32 bit value

skipFully

protected void skipFully(int n)
                  throws IOException
skip n bytes in the input stream.

Throws:
IOException

resolveMethod

protected final Member resolveMethod(int index)
                              throws IOException,
                                     ClassNotFoundException,
                                     NoSuchMethodException
Throws:
IOException
ClassNotFoundException
NoSuchMethodException

resolveField

protected final Field resolveField(int i)
                            throws IOException,
                                   ClassNotFoundException,
                                   NoSuchFieldException
Throws:
IOException
ClassNotFoundException
NoSuchFieldException

resolveNameAndType

protected final org.apache.cxf.common.util.ClassReader.NameAndType resolveNameAndType(int i)
                                                                               throws IOException
Throws:
IOException

resolveClass

protected final Class<?> resolveClass(int i)
                               throws IOException,
                                      ClassNotFoundException
Throws:
IOException
ClassNotFoundException

resolveUtf8

protected final String resolveUtf8(int i)
                            throws IOException
Throws:
IOException

readCpool

protected final void readCpool()
                        throws IOException
Throws:
IOException

skipAttributes

protected final void skipAttributes()
                             throws IOException
Throws:
IOException

readAttributes

protected final void readAttributes()
                             throws IOException
read an attributes array. the elements of a class file that can contain attributes are: fields, methods, the class itself, and some other types of attributes.

Throws:
IOException

readCode

public void readCode()
              throws IOException
read a code attribute

Throws:
IOException
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