ClassReader (Apache Axis)

java.lang.Object
- java.io.InputStream
- - java.io.ByteArrayInputStream
  - - org.apache.axis.utils.bytecode.ClassReader

All Implemented Interfaces:

Closeable, AutoCloseable

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

Constructors
Modifier Constructor and Description

protected ClassReader(byte[] buf, Map attrMethods)

Constructors
Modifier	Constructor and Description
`protected`	`ClassReader(byte[] buf, Map attrMethods)`

Method Summary

Methods
Modifier and Type	Method and Description
`protected static Map`	`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.axis.utils.bytecode.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 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 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.axis.utils.bytecode.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

Class ClassReader

Field Summary

Fields inherited from class java.io.ByteArrayInputStream

Constructor Summary

Method Summary

Methods inherited from class java.io.ByteArrayInputStream

Methods inherited from class java.io.InputStream

Methods inherited from class java.lang.Object

Constructor Detail

ClassReader

Method Detail

getBytes

findAttributeReaders

getSignature

readShort

readInt

skipFully

resolveMethod

resolveField

resolveNameAndType

resolveClass

resolveUtf8

readCpool

skipAttributes

readAttributes

readCode