Interface ModuleHashesAttribute

All Superinterfaces:: Attribute<ModuleHashesAttribute>, ClassElement, ClassFileElement

public sealed interface ModuleHashesAttribute extends Attribute<ModuleHashesAttribute>, ClassElement

Models the ModuleHashes attribute, which appears on classes that represent module descriptors to capture the hashes of a set of co-delivered modules.

The specification of the ModuleHashes attribute is:


ModuleHashes_attribute {
  // index to CONSTANT_utf8_info structure in constant pool representing
  // the string "ModuleHashes"
  u2 attribute_name_index;
  u4 attribute_length;

  // index to CONSTANT_utf8_info structure with algorithm name
  u2 algorithm_index;

  // the number of entries in the hashes table
  u2 hashes_count;
  {   u2 module_name_index (index to CONSTANT_Module_info structure)
      u2 hash_length;
      u1 hash[hash_length];
  } hashes[hashes_count];

}

This attribute only appears on classes, and does not permit multiple instances in a class. It has a data dependency on the constant pool.

This attribute is not predefined in the Java SE Platform. This is a JDK-specific nonstandard attribute produced by the jdk.jlink module, which defines the jlink and jmod tools.

Since:

See Also:

Method Summary

Modifier and Type	Method	Description
`Utf8Entry`	`algorithm()`	Returns the algorithm name used to compute the hash.
`List<ModuleHashInfo>`	`hashes()`	Returns the hash information about related modules.
`static ModuleHashesAttribute`	`of(Utf8Entry algorithm, ModuleHashInfo... hashes)`	Returns a `ModuleHashes` attribute.
`static ModuleHashesAttribute`	`of(Utf8Entry algorithm, List<ModuleHashInfo> hashes)`	Returns a `ModuleHashes` attribute.
`static ModuleHashesAttribute`	`of(String algorithm, ModuleHashInfo... hashes)`	Returns a `ModuleHashes` attribute.
`static ModuleHashesAttribute`	`of(String algorithm, List<ModuleHashInfo> hashes)`	Returns a `ModuleHashes` attribute.

Methods declared in interface Attribute

attributeMapper, attributeName

Method Details

algorithm

Utf8Entry algorithm()

Returns the algorithm name used to compute the hash.

Returns:: the algorithm name used to compute the hash

hashes

List<ModuleHashInfo> hashes()

Returns the hash information about related modules.

Returns:: the hash information about related modules

of

static ModuleHashesAttribute of(String algorithm, List<ModuleHashInfo> hashes)

Returns a ModuleHashes attribute.

Parameters:: algorithm - the hashing algorithm; hashes - the hash descriptions
Returns:: a ModuleHashes attribute

of

static ModuleHashesAttribute of(String algorithm, ModuleHashInfo... hashes)

Returns a ModuleHashes attribute.

Parameters:: algorithm - the hashing algorithm; hashes - the hash descriptions
Returns:: a ModuleHashes attribute

of

static ModuleHashesAttribute of(Utf8Entry algorithm, List<ModuleHashInfo> hashes)

Returns a ModuleHashes attribute.

Parameters:: algorithm - the hashing algorithm; hashes - the hash descriptions
Returns:: a ModuleHashes attribute

of

static ModuleHashesAttribute of(Utf8Entry algorithm, ModuleHashInfo... hashes)

Returns a ModuleHashes attribute.

Parameters:: algorithm - the hashing algorithm; hashes - the hash descriptions
Returns:: a ModuleHashes attribute

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https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/lang/classfile/attribute/ModuleHashesAttribute.html