Package org.objectweb.asm
Class Attribute
- java.lang.Object
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- org.objectweb.asm.Attribute
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public class Attribute extends Object
A non standard class, field, method or code attribute.- Author:
- Eric Bruneton, Eugene Kuleshov
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected Label[]
getLabels()
Returns the labels corresponding to this attribute.boolean
isCodeAttribute()
Returns true if this type of attribute is a code attribute.boolean
isUnknown()
Returns true if this type of attribute is unknown.protected Attribute
read(ClassReader cr, int off, int len, char[] buf, int codeOff, Label[] labels)
Reads atype
attribute.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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Field Detail
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type
public final String type
The type of this attribute.
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Constructor Detail
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Attribute
protected Attribute(String type)
Constructs a new empty attribute.- Parameters:
type
- the type of the attribute.
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Method Detail
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isUnknown
public boolean isUnknown()
Returns true if this type of attribute is unknown. The default implementation of this method always returns true.- Returns:
- true if this type of attribute is unknown.
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isCodeAttribute
public boolean isCodeAttribute()
Returns true if this type of attribute is a code attribute.- Returns:
- true if this type of attribute is a code attribute.
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getLabels
protected Label[] getLabels()
Returns the labels corresponding to this attribute.- Returns:
- the labels corresponding to this attribute, or null if this attribute is not a code attribute that contains labels.
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read
protected Attribute read(ClassReader cr, int off, int len, char[] buf, int codeOff, Label[] labels)
Reads atype
attribute. This method must return a newAttribute
object, of typetype
, corresponding to the len bytes starting at the given offset, in the given class reader.- Parameters:
cr
- the class that contains the attribute to be read.off
- index of the first byte of the attribute's content incr.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 callreadUTF8
,readClass
orreadConst
.codeOff
- index of the first byte of code's attribute content incr.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.- Returns:
- a new
Attribute
object corresponding to the given bytes.
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write
protected ByteVector write(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals)
Returns the byte array form of this attribute.- Parameters:
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.- Returns:
- the byte array form of this attribute.
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