org.apache.cxf.common.util
Class ClassReader

java.lang.Object
  java.io.InputStream
      java.io.ByteArrayInputStream
          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