Package org.apache.commons.compress.harmony.unpack200.bytecode

Class BCIRenumberedAttribute

java.lang.Object

org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry

org.apache.commons.compress.harmony.unpack200.bytecode.Attribute

org.apache.commons.compress.harmony.unpack200.bytecode.BCIRenumberedAttribute

Direct Known Subclasses:

CodeAttribute, LineNumberTableAttribute, LocalVariableTableAttribute, LocalVariableTypeTableAttribute, NewAttribute

public abstract class BCIRenumberedAttribute
extends Attribute

Abstract superclass for attributes that have some part encoded with Byte Code Injection (BCI) renumbering.

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	renumbered	Whether renumbering has occurred.

Fields inherited from class org.apache.commons.compress.harmony.unpack200.bytecode.Attribute

attributeName

Fields inherited from class org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry

NONE

Constructor Summary

Constructors

Constructor	Description
BCIRenumberedAttribute(CPUTF8 attributeName)	Constructs a new instance for an attribute name.

Method Summary

Modifier and Type	Method	Description
protected abstract int	getLength()	Gets the length.
protected abstract int[]	getStartPCs()	Gets the array of indices for the start of line numbers.
boolean	hasBCIRenumbering()	Answer true if the receiver needs to have BCI renumbering applied to it; otherwise answer false.
void	renumber(java.util.List<java.lang.Integer> byteCodeOffsets)	In Pack200, line number tables are BCI renumbered.
abstract java.lang.String	toString()
protected abstract void	writeBody(java.io.DataOutputStream dos)	Writes this body to the given output stream.

Methods inherited from class org.apache.commons.compress.harmony.unpack200.bytecode.Attribute

doWrite, equals, getAttributeName, getLengthIncludingHeader, getNestedClassFileEntries, hashCode, isSourceFileAttribute, resolve

Methods inherited from class org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry

objectHashCode, write

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

renumbered

protected boolean renumbered

Whether renumbering has occurred.

Constructor Detail

BCIRenumberedAttribute

public BCIRenumberedAttribute(CPUTF8 attributeName)

Constructs a new instance for an attribute name.

Parameters:

attributeName - an attribute name.

Method Detail

getLength

protected abstract int getLength()

Description copied from class: Attribute

Gets the length.

Specified by:

getLength in class Attribute

Returns:

the length.

getStartPCs

protected abstract int[] getStartPCs()

Gets the array of indices for the start of line numbers.

Returns:

the array of indices for the start of line numbers.

hasBCIRenumbering

public boolean hasBCIRenumbering()

Description copied from class: Attribute

Answer true if the receiver needs to have BCI renumbering applied to it; otherwise answer false.

Overrides:

hasBCIRenumbering in class Attribute

Returns:

boolean BCI renumbering required

renumber

public void renumber(java.util.List<java.lang.Integer> byteCodeOffsets)
              throws Pack200Exception

In Pack200, line number tables are BCI renumbered. This method takes the byteCodeOffsets (which is a List of Integers specifying the offset in the byte code array of each instruction) and updates the start_pcs so that it points to the instruction index itself, not the BCI renumbering of the instruction.

Parameters:

byteCodeOffsets - List of Integer offsets of the byte code array.

Throws:

Pack200Exception - Thrown from a subclass.

toString

public abstract java.lang.String toString()

Specified by:

toString in class ClassFileEntry

writeBody

protected abstract void writeBody(java.io.DataOutputStream dos)
                           throws java.io.IOException

Description copied from class: Attribute

Writes this body to the given output stream.

Specified by:

writeBody in class Attribute

Parameters:

dos - the output stream.

Throws:

java.io.IOException - if an I/O error occurs.