TruffleLanguage.Registration (GraalVM Truffle Java API Reference)

```
@Retention(value=RUNTIME)
 @Target(value=TYPE)
public static @interface TruffleLanguage.Registration
```
The annotation to use to register your language to the Polyglot API. By annotating your implementation of TruffleLanguage by this annotation the language can be discovered on the class path.

Since:

0.8 or earlier

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element and Description
`Class<?>[]`	`aotLibraryExports` Declarative list of exported libraries with AOT compilation provided by this language.
`String[]`	`byteMimeTypes` List of MIME types supported by this language which sources should be interpreted as `byte` based sources.
`String[]`	`characterMimeTypes` List of MIME types supported by this language which sources should be interpreted as `character` based sources.
`TruffleLanguage.ContextPolicy`	`contextPolicy` Defines the supported policy for reusing `languages` per context.
`Class<?>[]`	`defaultLibraryExports` Declarative list of exported libraries with dynamic dispatch provided by this language.
`String`	`defaultMimeType` Returns the default MIME type of this language.
`String[]`	`dependentLanguages` Specifies a list of languages that this language depends on.
`Class<? extends TruffleFile.FileTypeDetector>[]`	`fileTypeDetectors` Declarative list of `TruffleFile.FileTypeDetector` classes provided by this language.
`String`	`id` Unique id of your language.
`String`	`implementationName` Unique name of your language implementation.
`boolean`	`interactive` Specifies if the language is suitable for interactive evaluation of `sources`.
`boolean`	`internal` Returns `true` if this language is intended for internal use only.
`String`	`name` Unique name of your language.
`boolean`	`needsAllEncodings` Returns `true` if the language uses `TruffleString`s with encodings not present in the following list.
`SandboxPolicy`	`sandbox` Specifies the most strict sandbox policy in which the language can be used.
`Class<?>[]`	`services` Declarative list of classes this language is known to provide.
`String`	`version` Unique string identifying the language version.
`String`	`website` A link to a website with more information about the language.

- Element Detail
  - id
```
public abstract String id
```
    Unique id of your language. This id will be exposed to users via the getter. It is used as group identifier for options of the language.
    
    Returns:
    
    identifier of your language
    
    Since:
    
    0.8 or earlier
    
    Default:
    
    ""
- - name
```
public abstract String name
```
    Unique name of your language. This name will be exposed to users via the Language.getName() getter.
    
    Returns:
    
    identifier of your language
    
    Since:
    
    0.8 or earlier
    
    Default:
    
    ""
- - implementationName
```
public abstract String implementationName
```
    Unique name of your language implementation.
    
    Returns:
    
    the implementation name of your language
    
    Since:
    
    0.8 or earlier
    
    Default:
    
    ""
- - version
```
public abstract String version
```
    Unique string identifying the language version. This name will be exposed to users via the Language.getVersion() getter. It inherits from Engine.getVersion() by default.
    
    Returns:
    
    version of your language
    
    Since:
    
    0.8 or earlier
    
    Default:
    
    "inherit"
- - defaultMimeType
```
public abstract String defaultMimeType
```
    Returns the default MIME type of this language. The default MIME type allows embedders and other language or instruments to find out how content is interpreted if no MIME type was specified. The default MIME type must be specified in the list of supported character or byte based MIME types.
    The default MIME type is mandatory if more than one supported MIME type was specified. If no default MIME type and no supported MIME types were specified then all sources for this language will be interpreted as character based sources.
    
    Since:
    
    19.0
    
    See Also:
    
    LanguageInfo.getDefaultMimeType(), Language.getDefaultMimeType(), TruffleLanguage.Registration.characterMimeTypes(), TruffleLanguage.Registration.byteMimeTypes()
    
    Default:
    
    ""
- - characterMimeTypes
```
public abstract String[] characterMimeTypes
```
    List of MIME types supported by this language which sources should be interpreted as character based sources. Languages may use MIME types to differentiate supported source kinds. If a MIME type is declared as supported then the language needs to be able to parse sources of this kind. If only one supported MIME type was specified by a language then it will be used as default MIME type. If no supported character and byte based MIME types are specified then all sources will be interpreted as character based.
    
    Returns:
    
    array of MIME types assigned to your language files
    
    Since:
    
    19.0
    
    See Also:
    
    TruffleLanguage.Registration.defaultMimeType(), TruffleLanguage.Registration.byteMimeTypes()
    
    Default:
    
    {}
- - byteMimeTypes
```
public abstract String[] byteMimeTypes
```
    List of MIME types supported by this language which sources should be interpreted as byte based sources. Languages may use MIME types to differentiate supported source kinds. If a MIME type is declared as supported then the language needs to be able to parse sources of this kind. If only one supported MIME type was specified by a language then it will be used as default MIME type. If no supported character and byte based MIME types are specified then all sources will be interpreted as character based.
    
    Returns:
    
    array of MIME types assigned to your language files
    
    Since:
    
    19.0
    
    See Also:
    
    TruffleLanguage.Registration.defaultMimeType(), TruffleLanguage.Registration.characterMimeTypes()
    
    Default:
    
    {}
- - interactive
```
public abstract boolean interactive
```
    Specifies if the language is suitable for interactive evaluation of sources. Interactive languages should be displayed in interactive environments and presented to the user. The default value of this attribute is true assuming majority of the languages is interactive. Change the value to false to opt-out and turn your language into non-interactive one.
    
    Returns:
    
    true if the language should be presented to end-user in an interactive environment
    
    Since:
    
    0.22
    
    Default:
    
    true
- - internal
```
public abstract boolean internal
```
    Returns true if this language is intended for internal use only. Internal languages cannot be used in the host environment directly, they can only be used from other languages or from instruments.
    
    Since:
    
    0.27
    
    Default:
    
    false
- - dependentLanguages
```
public abstract String[] dependentLanguages
```
    Specifies a list of languages that this language depends on. Languages are referenced using their TruffleLanguage.Registration.id(). This has the following effects:
    - This language always has access to dependent languages if this language is accessible. Languages may not be accessible if language access is restricted.
    - This language is finalized before dependent language contexts are finalized.
    - This language is disposed before dependent language contexts are disposed.
    Non-internal languages implicitly depend on all internal languages. Therefore by default non-internal languages are disposed and finalized before internal languages.
    Dependent languages should be parsed with TruffleLanguage.Env.parseInternal(Source, String...) as the embedder might choose to disable access to it for TruffleLanguage.Env.parsePublic(Source, String...).
    Dependent languages references are optional. If a dependent language is not installed and the language needs to fail in such a case then the language should fail on context initialization. Cycles in dependencies will cause an IllegalStateException when one of the cyclic languages is initialized.
    Since:
    
    0.30
    
    Default:
    
    {}
- - contextPolicy
```
public abstract TruffleLanguage.ContextPolicy contextPolicy
```
    Defines the supported policy for reusing languages per context. I.e. the policy specifies the degree of sharing that is allowed between multiple language contexts. The default policy is exclusive. Every language is encouraged to try to support a context policy that is as permissive as possible, where exclusive is the least and shared is the most permissive policy. Parse caching is scoped per language instance, therefore the context policy influences its behavior.
    The context policy applies to contexts that were created using the polyglot API as well as for inner contexts. The context policy does not apply to nodes that were created using the Truffle interop protocol. Therefore, interop message nodes always need to be prepared to be used with policy TruffleLanguage.ContextPolicy.SHARED.
    
    Since:
    
    19.0
    
    See Also:
    
    TruffleLanguage.parse(ParsingRequest)
    
    Default:
    
    EXCLUSIVE
- - services
```
public abstract Class<?>[] services
```
    Declarative list of classes this language is known to provide. The language is supposed to override its createContext method and instantiate and register all here in defined services.
    Languages automatically get created but not yet initialized when their registered service is requested.
    
    Returns:
    
    list of service types that this language can provide
    
    Since:
    
    19.0
    
    Default:
    
    {}
- - fileTypeDetectors
```
public abstract Class<? extends TruffleFile.FileTypeDetector>[] fileTypeDetectors
```
    Declarative list of TruffleFile.FileTypeDetector classes provided by this language.
    The language has to support all MIME types recognized by the registered file type detectors.
    
    Returns:
    
    list of file type detectors
    
    Since:
    
    19.0
    
    Default:
    
    {}
- - needsAllEncodings
```
public abstract boolean needsAllEncodings
```
    Returns true if the language uses TruffleStrings with encodings not present in the following list.
    - UTF-8
    - UTF-16
    - UTF-32
    - ISO-8859-1
    - US-ASCII
    - BYTES
    Since:
    
    22.1
    
    Default:
    
    false
- - website
```
public abstract String website
```
    A link to a website with more information about the language. Will be shown in the help text of GraalVM launchers.
    The link can contain the following substitutions:
    
    ${graalvm-version}
    
    the current GraalVM version. Optionally, a format string can be provided for the version using ${graalvm-version:format}. See Version.format(java.lang.String).
    ${graalvm-website-version}
    
    the current GraalVM version in a format suitable for links to the GraalVM reference manual. The exact format may change without notice.
    
    Returns:
    
    URL for language website.
    
    Since:
    
    22.1.0
    
    Default:
    
    ""
- - sandbox
```
public abstract SandboxPolicy sandbox
```
    Specifies the most strict sandbox policy in which the language can be used. The language can be used in a context with the specified sandbox policy or a weaker one. For example, if a language specifies ISOLATED policy, it can be used in a context configured with sandbox policy TRUSTED, CONSTRAINED or ISOLATED. But it cannot be used in a context configured with the UNTRUSTED sandbox policy.
    
    Since:
    
    23.0
    
    See Also:
    
    SandboxPolicy
    
    Default:
    
    TRUSTED
- - defaultLibraryExports
```
public abstract Class<?>[] defaultLibraryExports
```
    Declarative list of exported libraries with dynamic dispatch provided by this language.
    
    Since:
    
    23.1
    
    Default:
    
    {}
- - aotLibraryExports
```
public abstract Class<?>[] aotLibraryExports
```
    Declarative list of exported libraries with AOT compilation provided by this language.
    
    Since:
    
    23.1
    
    Default:
    
    {}

Annotation Type TruffleLanguage.Registration

Optional Element Summary

Element Detail

id

name

implementationName

version

defaultMimeType

characterMimeTypes

byteMimeTypes

interactive

internal

dependentLanguages

contextPolicy

services

fileTypeDetectors

needsAllEncodings

website

sandbox

defaultLibraryExports

aotLibraryExports