Package org.aspectj.weaver

Class WeaverStateInfo

java.lang.Object

org.aspectj.weaver.WeaverStateInfo

public class WeaverStateInfo
extends Object

WeaverStateInfo represents how a type was processed. It is used by the weaver to determine how a type was previously treated and whether reweaving is allowed. The format in the data stream is: Byte: Kind. UNTOUCHED|WOVEN|EXTENDED - If extended it can have two extra bits set 'REWEAVABLE' and 'REWEAVABLE_COMPRESSION_BIT' Short: typeMungerCount - how many type mungers have affected this type <UnresolvedType & ResolvedTypeMunger>: The type mungers themselves If we are reweavable then we also have: Short: Number of aspects that touched this type in some way when it was previously woven <String> The fully qualified name of each type Int: Length of class file data (i.e. the unwovenclassfile) Byte[]: The class file data, compressed if REWEAVABLE_COMPRESSION_BIT set.

Author:

Andy Clement

Constructor Summary

Constructors

Constructor	Description
WeaverStateInfo(boolean reweavable)

Method Summary

Modifier and Type	Method	Description
void	addAspectAffectingType(String aspectSignature)
void	addAspectsAffectingType(Collection<String> aspects)
void	addConcreteMunger(ConcreteTypeMunger munger)
Set<String>	getAspectsAffectingType()
List<ConcreteTypeMunger>	getTypeMungers(ResolvedType onType)
byte[]	getUnwovenClassFileData()
byte[]	getUnwovenClassFileData(byte[] wovenClassFile)
boolean	isAspectAlreadyApplied(ResolvedType someAspect)
boolean	isOldStyle()
boolean	isReweavable()
void	markOverweavingInUse()	If the weaver is ever invoked in over weaving mode, we should not include the key when writing out, it won't be replaced later.
static final WeaverStateInfo	read(VersionedDataInputStream s, ISourceContext context)	See comments on write()
byte[]	replaceKeyWithDiff(byte[] wovenClassFile)	Here is the cleverness for reweavable diff mode.
void	setReweavable(boolean rw)
static void	setReweavableModeDefaults(boolean mode, boolean compress, boolean diff)
void	setUnwovenClassFileData(byte[] data)
String	toString()
void	write(CompressingDataOutputStream s)	Serialize the WeaverStateInfo.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

WeaverStateInfo

public WeaverStateInfo(boolean reweavable)

Method Details

setReweavableModeDefaults

public static void setReweavableModeDefaults(boolean mode,
 boolean compress,
 boolean diff)

read

public static final WeaverStateInfo read(VersionedDataInputStream s,
 ISourceContext context)
                                  throws IOException

See comments on write()

Throws:

IOException

write

public void write(CompressingDataOutputStream s)
           throws IOException

Serialize the WeaverStateInfo. Various bits are set within the 'kind' flag to indicate the structure of the attribute. In reweavable diff mode a 'marker' is inserted at the start of the attribute to indicate where the final calculated diff should be inserted. When the key is replaced with the diff, the 'kind' byte moves to the front of the attribute - thats why in the read logic you'll see it expecting the kind as the first byte.

Throws:

IOException

markOverweavingInUse

public void markOverweavingInUse()

If the weaver is ever invoked in over weaving mode, we should not include the key when writing out, it won't be replaced later. If we turn off the reweaving flag that unfortunately removes the 'what aspects have been woven into this type' list which we want to keep as it helps overweaving avoid weaving an aspect in twice.

addConcreteMunger

public void addConcreteMunger(ConcreteTypeMunger munger)

toString

public String toString()

Overrides:

toString in class Object

getTypeMungers

public List<ConcreteTypeMunger> getTypeMungers(ResolvedType onType)

isOldStyle

public boolean isOldStyle()

getUnwovenClassFileData

public byte[] getUnwovenClassFileData()

getUnwovenClassFileData

public byte[] getUnwovenClassFileData(byte[] wovenClassFile)

setUnwovenClassFileData

public void setUnwovenClassFileData(byte[] data)

isReweavable

public boolean isReweavable()

setReweavable

public void setReweavable(boolean rw)

addAspectsAffectingType

public void addAspectsAffectingType(Collection<String> aspects)

addAspectAffectingType

public void addAspectAffectingType(String aspectSignature)

getAspectsAffectingType

public Set<String> getAspectsAffectingType()

replaceKeyWithDiff

public byte[] replaceKeyWithDiff(byte[] wovenClassFile)

Here is the cleverness for reweavable diff mode. The class file on disk contains, inside the weaverstateinfo attribute, a diff that can be applied to 'itself' to recover the original class - which can then be rewoven.

isAspectAlreadyApplied

public boolean isAspectAlreadyApplied(ResolvedType someAspect)

Returns:

true if the supplied aspect is already in the list of those affecting this type