DefaultValueConverter (Debezium Core 1.8.0.Beta1 API)

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface DefaultValueConverter
```
This interface is used to convert the string default value to a Java type recognized by value converters for a subset of types.

Author:

Jiabao Sun

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static interface DefaultValueConverter.DefaultValueMapper
Converts the raw JDBC default value expression for a column into an object.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Optional<Object>`	`parseDefaultValue(Column column, String defaultValueExpression)`	This interface is used to convert the default value literal to a Java type recognized by value converters for a subset of types.
`static DefaultValueConverter`	`passthrough()`	Obtain a DefaultValueConverter that passes through values.

- Method Detail
  - parseDefaultValue
```
Optional<Object> parseDefaultValue(Column column,
                                   String defaultValueExpression)
```
    This interface is used to convert the default value literal to a Java type recognized by value converters for a subset of types.
    
    Parameters:
    
    column - the column definition describing the data value; never null
    
    defaultValueExpression - the default value literal; may be null
    
    Returns:
    
    value converted to a Java type; optional
  - passthrough
```
static DefaultValueConverter passthrough()
```
    Obtain a DefaultValueConverter that passes through values.
    
    Returns:
    
    the pass-through DefaultValueConverter; never null