ClassReader (${name} Classes)

java.lang.Object
- com.sleepycat.asm.ClassReader

```
public class ClassReader
extends java.lang.Object
```
A Java class parser to make a ClassVisitor visit an existing class. This class parses a byte array conforming to the Java class file format and calls the appropriate visit methods of a given class visitor for each field, method and bytecode instruction encountered.

Author:

Eric Bruneton, Eugene Kuleshov

Field Summary

Fields
Modifier and Type Field and Description

byte[] b
The class to be parsed.

int header
Start index of the class header information (access, name...) in b.

Fields
Modifier and Type	Field and Description
`byte[]`	`b` The class to be parsed.
`int`	`header` Start index of the class header information (access, name...) in `b`.

Constructor Summary

Constructors
Constructor and Description
`ClassReader(byte[] b)` Constructs a new `ClassReader` object.
`ClassReader(byte[] b, int off, int len)` Constructs a new `ClassReader` object.
`ClassReader(java.io.InputStream is)` Constructs a new `ClassReader` object.
`ClassReader(java.lang.String name)` Constructs a new `ClassReader` object.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`accept(ClassVisitor classVisitor, Attribute[] attrs, boolean skipDebug)` Makes the given visitor visit the Java class of this `ClassReader`.
`void`	`accept(ClassVisitor classVisitor, boolean skipDebug)` Makes the given visitor visit the Java class of this `ClassReader`.
`(package private) void`	`copyPool(ClassWriter classWriter)` Copies the constant pool data into the given `ClassWriter`.
`int`	`getItem(int item)` Returns the start index of the constant pool item in `b`, plus one.
`int`	`readByte(int index)` Reads a byte value in `b`.
`java.lang.String`	`readClass(int index, char[] buf)` Reads a class constant pool item in `b`.
`java.lang.Object`	`readConst(int item, char[] buf)` Reads a numeric or string constant pool item in `b`.
`int`	`readInt(int index)` Reads a signed int value in `b`.
`long`	`readLong(int index)` Reads a signed long value in `b`.
`short`	`readShort(int index)` Reads a signed short value in `b`.
`int`	`readUnsignedShort(int index)` Reads an unsigned short value in `b`.
`java.lang.String`	`readUTF8(int index, char[] buf)` Reads an UTF8 string constant pool item in `b`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - b
```
public final byte[] b
```
    The class to be parsed. The content of this array must not be modified. This field is intended for Attribute sub classes, and is normally not needed by class generators or adapters.
  - header
```
public final int header
```
    Start index of the class header information (access, name...) in b.
- Constructor Detail
  - ClassReader
```
public ClassReader(byte[] b)
```
    Constructs a new ClassReader object.
    
    Parameters:
    b - the bytecode of the class to be read.
  - ClassReader
```
public ClassReader(byte[] b,
           int off,
           int len)
```
    Constructs a new ClassReader object.
    
    Parameters:
    b - the bytecode of the class to be read.
    off - the start offset of the class data.
    len - the length of the class data.
  - ClassReader
```
public ClassReader(java.io.InputStream is)
            throws java.io.IOException
```
    Constructs a new ClassReader object.
    
    Parameters:
    is - an input stream from which to read the class.
    
    Throws:
    
    java.io.IOException - if a problem occurs during reading.
  - ClassReader
```
public ClassReader(java.lang.String name)
            throws java.io.IOException
```
    Constructs a new ClassReader object.
    
    Parameters:
    name - the fully qualified name of the class to be read.
    
    Throws:
    
    java.io.IOException - if an exception occurs during reading.
- Method Detail
  - copyPool
```
void copyPool(ClassWriter classWriter)
```
    Copies the constant pool data into the given ClassWriter. Should be called before the accept(ClassVisitor,boolean) method.
    
    Parameters:
    classWriter - the ClassWriter to copy constant pool into.
  - accept
```
public void accept(ClassVisitor classVisitor,
          boolean skipDebug)
```
    Makes the given visitor visit the Java class of this ClassReader. This class is the one specified in the constructor (see ClassReader).
    
    Parameters:
    classVisitor - the visitor that must visit this class.
    skipDebug - true if the debug information of the class must not be visited. In this case the visitLocalVariable and visitLineNumber methods will not be called.
  - accept
```
public void accept(ClassVisitor classVisitor,
          Attribute[] attrs,
          boolean skipDebug)
```
    Makes the given visitor visit the Java class of this ClassReader. This class is the one specified in the constructor (see ClassReader).
    
    Parameters:
    classVisitor - the visitor that must visit this class.
    attrs - prototypes of the attributes that must be parsed during the visit of the class. Any attribute whose type is not equal to the type of one the prototypes will be ignored.
    skipDebug - true if the debug information of the class must not be visited. In this case the visitLocalVariable and visitLineNumber methods will not be called.
  - getItem
```
public int getItem(int item)
```
    Returns the start index of the constant pool item in b, plus one. This method is intended for Attribute sub classes, and is normally not needed by class generators or adapters.
    
    Parameters:
    item - the index a constant pool item.
    
    Returns:
    the start index of the constant pool item in b, plus one.
  - readByte
```
public int readByte(int index)
```
    Reads a byte value in b. This method is intended for Attribute sub classes, and is normally not needed by class generators or adapters.
    
    Parameters:
    index - the start index of the value to be read in b.
    
    Returns:
    the read value.
  - readUnsignedShort
```
public int readUnsignedShort(int index)
```
    Reads an unsigned short value in b. This method is intended for Attribute sub classes, and is normally not needed by class generators or adapters.
    
    Parameters:
    index - the start index of the value to be read in b.
    
    Returns:
    the read value.
  - readShort
```
public short readShort(int index)
```
    Reads a signed short value in b. This method is intended for Attribute sub classes, and is normally not needed by class generators or adapters.
    
    Parameters:
    index - the start index of the value to be read in b.
    
    Returns:
    the read value.
  - readInt
```
public int readInt(int index)
```
    Reads a signed int value in b. This method is intended for Attribute sub classes, and is normally not needed by class generators or adapters.
    
    Parameters:
    index - the start index of the value to be read in b.
    
    Returns:
    the read value.
  - readLong
```
public long readLong(int index)
```
    Reads a signed long value in b. This method is intended for Attribute sub classes, and is normally not needed by class generators or adapters.
    
    Parameters:
    index - the start index of the value to be read in b.
    
    Returns:
    the read value.
  - readUTF8
```
public java.lang.String readUTF8(int index,
                        char[] buf)
```
    Reads an UTF8 string constant pool item in b. This method is intended for Attribute sub classes, and is normally not needed by class generators or adapters.
    
    Parameters:
    index - the start index of an unsigned short value in b, whose value is the index of an UTF8 constant pool item.
    buf - buffer to be used to read the item. This buffer must be sufficiently large. It is not automatically resized.
    
    Returns:
    the String corresponding to the specified UTF8 item.
  - readClass
```
public java.lang.String readClass(int index,
                         char[] buf)
```
    Reads a class constant pool item in b. This method is intended for Attribute sub classes, and is normally not needed by class generators or adapters.
    
    Parameters:
    index - the start index of an unsigned short value in b, whose value is the index of a class constant pool item.
    buf - buffer to be used to read the item. This buffer must be sufficiently large. It is not automatically resized.
    
    Returns:
    the String corresponding to the specified class item.
  - readConst
```
public java.lang.Object readConst(int item,
                         char[] buf)
```
    Reads a numeric or string constant pool item in b. This method is intended for Attribute sub classes, and is normally not needed by class generators or adapters.
    
    Parameters:
    item - the index of a constant pool item.
    buf - buffer to be used to read the item. This buffer must be sufficiently large. It is not automatically resized.
    
    Returns:
    the Integer, Float, Long, Double, String or Type corresponding to the given constant pool item.

Class ClassReader

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

b

header

Constructor Detail

ClassReader

ClassReader

ClassReader

ClassReader

Method Detail

copyPool

accept

accept

getItem

readByte

readUnsignedShort

readShort

readInt

readLong

readUTF8

readClass

readConst