org.mvel2.asm.commons
Class ModuleHashesAttribute

java.lang.Object
  org.mvel2.asm.Attribute
      org.mvel2.asm.commons.ModuleHashesAttribute

public final class ModuleHashesAttribute
extends Attribute

ModuleHashes attribute. This attribute is specific to the OpenJDK and may change in the future.

Author:

Remi Forax

Field Summary

String	algorithm
List<byte[]>	hashes
List<String>	modules

Fields inherited from class org.mvel2.asm.Attribute

type

Constructor Summary

ModuleHashesAttribute()
Creates an empty attribute that can be used as prototype to be passed as argument of the method ClassReader#accept(org.objectweb.asm.ClassVisitor, Attribute[], int).

ModuleHashesAttribute(String algorithm, List<String> modules, List<byte[]> hashes)
Creates an attribute with a hashing algorithm, a list of module names, and a list of the same length of hashes.

Method Summary

protected Attribute	read(ClassReader cr, int off, int len, char[] buf, int codeOff, Label[] labels) Reads a type attribute.
protected ByteVector	write(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals) Returns the byte array form of this attribute.

Methods inherited from class org.mvel2.asm.Attribute

getLabels, isCodeAttribute, isUnknown

Methods inherited from class java.lang.Object

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

Field Detail

algorithm

public String algorithm

modules

public List<String> modules

hashes

public List<byte[]> hashes

Constructor Detail

ModuleHashesAttribute

public ModuleHashesAttribute(String algorithm,
                             List<String> modules,
                             List<byte[]> hashes)

Creates an attribute with a hashing algorithm, a list of module names, and a list of the same length of hashes.

Parameters:

algorithm - the hashing algorithm name.

modules - a list of module name

hashes - a list of hash, one for each module name.

ModuleHashesAttribute

public ModuleHashesAttribute()

Creates an empty attribute that can be used as prototype to be passed as argument of the method ClassReader#accept(org.objectweb.asm.ClassVisitor, Attribute[], int).

Method Detail

read

protected Attribute read(ClassReader cr,
                         int off,
                         int len,
                         char[] buf,
                         int codeOff,
                         Label[] labels)

Description copied from class: Attribute

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.

Overrides:

read in class Attribute

Parameters:

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.

Returns:

a new Attribute object corresponding to the given bytes.

write

protected ByteVector write(ClassWriter cw,
                           byte[] code,
                           int len,
                           int maxStack,
                           int maxLocals)

Description copied from class: Attribute

Returns the byte array form of this attribute.

Overrides:

write in class 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.