ContractCompanion

java.lang.Object
- com.daml.ledger.javaapi.data.codegen.ContractTypeCompanion<Ct,Id,Data,Data>
- - com.daml.ledger.javaapi.data.codegen.ContractCompanion<Ct,Id,Data>

Type Parameters:

Ct - The Contract subclass generated within the template class.

Id - The ContractId subclass generated within the template class.

Data - The generated Template subclass named after the template, whose instances contain only the payload.

Direct Known Subclasses:

ContractCompanion.WithKey, ContractCompanion.WithoutKey
```
public abstract class ContractCompanion<Ct,Id,Data>
extends ContractTypeCompanion<Ct,Id,Data,Data>
```
Metadata and utilities associated with a template as a whole, rather than one single contract made from that template.
Application code should not instantiate or subclass; instead, refer to the COMPANION field on generated Template subclasses. All protected members herein are considered part of the INTERNAL API.
Every instance is either a ContractCompanion.WithKey or ContractCompanion.WithoutKey, depending on whether the template defined a key type. ContractCompanion.WithKey defines extra utilities for working with contract keys.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static interface`	`ContractCompanion.FromJson<T>`
`static class`	`ContractCompanion.WithKey<Ct,Id,Data,Key>`
`static class`	`ContractCompanion.WithoutKey<Ct,Id,Data>`

Field Summary

Fields
Modifier and Type Field Description

protected ContractCompanion.FromJson<Data> fromJson
- Fields inherited from class com.daml.ledger.javaapi.data.codegen.ContractTypeCompanion
  choices, TEMPLATE_ID

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Data`	`fromJson(java.lang.String json)`
`static <Data> ValueDecoder<Data>`	`valueDecoder(ContractCompanion<?,? extends ContractId<Data>,Data> companion)`	Static method to generate an implementation of `ValueDecoder` of type `Data` with metadata from the provided `ContractCompanion`.

Methods inherited from class com.daml.ledger.javaapi.data.codegen.ContractTypeCompanion
fromCreatedEvent, toContractId

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - fromJson
```
protected final ContractCompanion.FromJson<Data> fromJson
```
- Method Detail
  - valueDecoder
```
public static <Data> ValueDecoder<Data> valueDecoder(ContractCompanion<?,? extends ContractId<Data>,Data> companion)
```
    Static method to generate an implementation of ValueDecoder of type Data with metadata from the provided ContractCompanion.
    
    Parameters:
    
    companion - an instance of ContractCompanion.
    
    Returns:
    
    The ValueDecoder for parsing Value to get an instance of Data.
  - fromJson
```
public Data fromJson(java.lang.String json)
              throws JsonLfDecoder.Error
```
    Throws:
    
    JsonLfDecoder.Error