org.objectweb.asm
Class Attribute
A non standard class, field, method or code attribute.
- Eric Bruneton, Eugene Kuleshov
Attribute | next - The next attribute in this attribute list.
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String | type - The type of this attribute.
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Attribute(String type) - Constructs a new empty attribute.
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protected Label[] | getLabels() - Returns the labels corresponding to this attribute.
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boolean | isUnknown() - Returns true if this type of attribute is unknown.
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protected Attribute | read(ClassReader cr, int off, int len, char[] buf, int codeOff, Label[] labels) - Reads a
type attribute.
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protected ByteVector | write(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals) - Returns the byte array form of this attribute.
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next
public Attribute next
The next attribute in this attribute list. May be null.
type
public final String type
The type of this attribute.
Attribute
protected Attribute(String type)
Constructs a new empty attribute.
type
- the type of the attribute.
getLabels
protected Label[] getLabels()
Returns the labels corresponding to this attribute.
- the labels corresponding to this attribute, or null if
this attribute is not a code attribute that contains labels.
isUnknown
public boolean isUnknown()
Returns true if this type of attribute is unknown.
- true if the class of this object is equal to
Attribute
.
read
protected Attribute read(ClassReader cr,
int off,
int len,
char[] buf,
int codeOff,
Label[] labels)
Reads a
type
attribute. This method must return a
new
Attribute
object, of type
type
, corresponding to the
len bytes starting at the given offset, in the given class reader.
cr
- the class that contains the attribute to be read.off
- index of the first byte of the attribute's content in cr.b
. The 6 attribute header bytes, containing the type
and the length of the attribute, are not taken into account here.len
- the length of the attribute's content.buf
- buffer to be used to call readUTF8
,
readClass
or readConst
.codeOff
- index of the first byte of code's attribute content in
cr.b
, or -1 if the attribute to be read is not a
code attribute. The 6 attribute header bytes, containing the type and
the length of the attribute, are not taken into account here.labels
- the labels of the method's code, or null if the
attribute to be read is not a code attribute.
- a new
Attribute
object corresponding to the given
bytes.
write
protected ByteVector write(ClassWriter cw,
byte[] code,
int len,
int maxStack,
int maxLocals)
Returns the byte array form of this attribute.
cw
- the class to which this attribute must be added. This parameter
can be used to add to the constant pool of this class the items that
corresponds to this attribute.code
- the bytecode of the method corresponding to this code
attribute, or null if this attribute is not a code
attributes.len
- the length of the bytecode of the method corresponding to this
code attribute, or null if this attribute is not a code
attribute.maxStack
- the maximum stack size of the method corresponding to this
code attribute, or -1 if this attribute is not a code attribute.maxLocals
- the maximum number of local variables of the method
corresponding to this code attribute, or -1 if this attribute is not
a code attribute.
- the byte array form of this attribute.