SchemaTransformation (apache-cassandra API)

All Known Implementing Classes:

AlterKeyspaceStatement, AlterSchemaStatement, AlterTableStatement, AlterTableStatement.AlterColumn, AlterTypeStatement, AlterViewStatement, CreateAggregateStatement, CreateFunctionStatement, CreateIndexStatement, CreateKeyspaceStatement, CreateTableStatement, CreateTriggerStatement, CreateTypeStatement, CreateViewStatement, DropAggregateStatement, DropFunctionStatement, DropIndexStatement, DropKeyspaceStatement, DropTableStatement, DropTriggerStatement, DropTypeStatement, DropViewStatement
```
public interface SchemaTransformation
```

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static class SchemaTransformation.SchemaTransformationResult
The result of applying (on this node) a given schema transformation.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`Keyspaces`	`apply(Keyspaces schema)`	Apply a statement transformation to a schema snapshot.
`default java.util.Optional<java.lang.Long>`	`fixedTimestampMicros()`	If the transformation should be applied with a certain timestamp, this method should be overriden.

- Method Detail
  - apply
```
Keyspaces apply(Keyspaces schema)
```
    Apply a statement transformation to a schema snapshot.
    Implementing methods should be side-effect free (outside of throwing exceptions if the transformation cannot be successfully applied to the provided schema).
    
    Parameters:
    
    schema - Keyspaces to base the transformation on
    
    Returns:
    
    Keyspaces transformed by the statement
  - fixedTimestampMicros
```
default java.util.Optional<java.lang.Long> fixedTimestampMicros()
```
    If the transformation should be applied with a certain timestamp, this method should be overriden. This is used by SchemaTransformations.updateSystemKeyspace(KeyspaceMetadata, long) when we need to set the fixed timestamp in order to preserve user settings.