> ## Documentation Index
> Fetch the complete documentation index at: https://cantonfoundation-generated-reference-full-stack-preview.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# InterfaceCompanion

> Metadata and utilities associated with an interface as a whole. Its subclasses serve to disambiguate various generated toInterface overloads.

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  <h1 class="x2mdx-ref-title">InterfaceCompanion</h1>

  <p class="x2mdx-ref-summary">Metadata and utilities associated with an interface as a whole. Its subclasses serve to disambiguate various generated toInterface overloads.</p>

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## Signature

```java theme={"theme":{"light":"github-light","dark":"github-dark"}}
public class InterfaceCompanion<I,Id,View> extends ContractTypeCompanion<Contract<Id,View>,Id,I,View>
```

## Members

| Member                                                       | Lifecycle     | Upstream docs                                                                                                                                                                                                                                             |
| ------------------------------------------------------------ | ------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `fromCreatedEvent(CreatedEvent)`                             | -             | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.15/com/daml/ledger/javaapi/data/codegen/InterfaceCompanion.html#fromCreatedEvent%28com.daml.ledger.javaapi.data.CreatedEvent%29)                                                                 |
| `fromCreatedEvent(CreatedEvent, UnknownTrailingFieldPolicy)` | Added `3.5.1` | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.15/com/daml/ledger/javaapi/data/codegen/InterfaceCompanion.html#fromCreatedEvent%28com.daml.ledger.javaapi.data.CreatedEvent,com.daml.ledger.javaapi.data.codegen.UnknownTrailingFieldPolicy%29) |
| `fromJson(String)`                                           | -             | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.15/com/daml/ledger/javaapi/data/codegen/InterfaceCompanion.html#fromJson%28java.lang.String%29)                                                                                                  |
| `valueDecoder`                                               | -             | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.15/com/daml/ledger/javaapi/data/codegen/InterfaceCompanion.html#valueDecoder)                                                                                                                    |
| `withPackageId(String)`                                      | Added `3.5.4` | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.15/com/daml/ledger/javaapi/data/codegen/InterfaceCompanion.html#withPackageId%28java.lang.String%29)                                                                                             |