Module org.eclipse.persistence.asm

Package org.eclipse.persistence.internal.libraries.asm.commons

Class ModuleHashesAttribute

java.lang.Object

org.eclipse.persistence.internal.libraries.asm.Attribute

org.eclipse.persistence.internal.libraries.asm.commons.ModuleHashesAttribute

public final class ModuleHashesAttribute
extends Attribute

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

Field Summary

Fields

Modifier and Type	Field	Description
String	algorithm	The name of the hashing algorithm.
List<byte[]>	hashes	The hash of the modules in modules.
List<String>	modules	A list of module names.

Fields inherited from class org.eclipse.persistence.internal.libraries.asm.Attribute

type

Constructor Summary

Constructors

Constructor	Description
ModuleHashesAttribute()	Constructs an empty ModuleHashesAttribute.
ModuleHashesAttribute(String algorithm, List<String> modules, List<byte[]> hashes)	Constructs a new ModuleHashesAttribute.

Method Summary

Modifier and Type	Method	Description
protected Attribute	read(ClassReader classReader, int offset, int length, char[] charBuffer, int codeAttributeOffset, Label[] labels)	Reads a Attribute.type attribute.
protected ByteVector	write(ClassWriter classWriter, byte[] code, int codeLength, int maxStack, int maxLocals)	Returns the byte array form of the content of this attribute.

Methods inherited from class org.eclipse.persistence.internal.libraries.asm.Attribute

getLabels, isCodeAttribute, isUnknown, read, readLabel, write

Methods inherited from class java.lang.Object

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

Field Details

algorithm

public String algorithm

The name of the hashing algorithm.

modules

public List<String> modules

A list of module names.

hashes

public List<byte[]> hashes

The hash of the modules in modules. The two lists must have the same size.

Constructor Details

ModuleHashesAttribute

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

Constructs a new ModuleHashesAttribute.

Parameters:

algorithm - the name of the hashing algorithm.

modules - a list of module names.

hashes - the hash of the modules in 'modules'. The two lists must have the same size.

ModuleHashesAttribute

public ModuleHashesAttribute()

Constructs an empty ModuleHashesAttribute. This object can be passed as a prototype to the ClassReader.accept(org.eclipse.persistence.internal.libraries.asm.ClassVisitor, Attribute[], int) method.

Method Details

read

protected Attribute read(ClassReader classReader,
 int offset,
 int length,
 char[] charBuffer,
 int codeAttributeOffset,
 Label[] labels)

Description copied from class: Attribute

Reads a Attribute.type attribute. This method must return a new Attribute object, of type Attribute.type, corresponding to the 'length' bytes starting at 'offset', in the given ClassReader.

Overrides:

read in class Attribute

Parameters:

classReader - the class that contains the attribute to be read.

offset - index of the first byte of the attribute's content in ClassReader. The 6 attribute header bytes (attribute_name_index and attribute_length) are not taken into account here.

length - the length of the attribute's content (excluding the 6 attribute header bytes).

charBuffer - the buffer to be used to call the ClassReader methods requiring a 'charBuffer' parameter.

codeAttributeOffset - index of the first byte of content of the enclosing Code attribute in ClassReader, or -1 if the attribute to be read is not a Code attribute. The 6 attribute header bytes (attribute_name_index and attribute_length) 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. Labels defined in the attribute must be created and added to this array, if not already present, by calling the Attribute.readLabel(org.eclipse.persistence.internal.libraries.asm.ClassReader, int, org.eclipse.persistence.internal.libraries.asm.Label[]) method (do not create Label instances directly).

Returns:

a new Attribute object corresponding to the specified bytes.

write

protected ByteVector write(ClassWriter classWriter,
 byte[] code,
 int codeLength,
 int maxStack,
 int maxLocals)

Description copied from class: Attribute

Returns the byte array form of the content of this attribute. The 6 header bytes (attribute_name_index and attribute_length) must not be added in the returned ByteVector.

This method is only invoked once to compute the binary form of this attribute. Subsequent changes to the attribute after it was written for the first time will not be considered.

Overrides:

write in class Attribute

Parameters:

classWriter - the class to which this attribute must be added. This parameter can be used to add the items that corresponds to this attribute to the constant pool of this class.

code - the bytecode of the method corresponding to this Code attribute, or null if this attribute is not a Code attribute. Corresponds to the 'code' field of the Code attribute.

codeLength - the length of the bytecode of the method corresponding to this code attribute, or 0 if this attribute is not a Code attribute. Corresponds to the 'code_length' field of the 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.