io.debezium.embedded

Interface AvailableVariables

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 AvailableVariables

A functional interface for obtaining the value of variables given their names.

Author:

Randall Hauch

Method Summary

Modifier and Type	Method and Description
default AvailableVariables	and(AvailableVariables next) Obtain an AvailableVariables function that first checks this instance and then checks the supplied instance.
static AvailableVariables	configVariables(Configuration config) Get an AvailableVariables that returns the value of a Configuration property.
static AvailableVariables	empty() Get an AvailableVariables that always returns null.
static AvailableVariables	environmentVariables(Configuration config) Get an AvailableVariables that returns System environment variables set with operating system environment variables (e.g., ${JAVA_HOME}).
static AvailableVariables	systemVariables(Configuration config) Get an AvailableVariables that returns System properties set with -Dvariable=value.
String	variableForName(String varName) Obtain the value of a variable with the given name.

Method Detail

configVariables

static AvailableVariables configVariables(Configuration config)

Get an AvailableVariables that returns the value of a Configuration property.

Parameters:

config - the configuration

Returns:

the available variables function that returns the configuration property value for the given property name; never null

systemVariables

static AvailableVariables systemVariables(Configuration config)

Get an AvailableVariables that returns System properties set with -Dvariable=value.

This method does not use the configuration.

Parameters:

config - the configuration

Returns:

the available variables function that returns System properties; never null

environmentVariables

static AvailableVariables environmentVariables(Configuration config)

Get an AvailableVariables that returns System environment variables set with operating system environment variables (e.g., ${JAVA_HOME}).

This method does not use the configuration.

Parameters:

config - the configuration

Returns:

the available variables function that returns System properties; never null

empty

static AvailableVariables empty()

Get an AvailableVariables that always returns null.

Returns:

the empty available variables function that always return null.

variableForName

String variableForName(String varName)

Obtain the value of a variable with the given name.

Parameters:

varName - the variable name; may be null

Returns:

the value of the variable; may be null if the named variable is not known

and

default AvailableVariables and(AvailableVariables next)

Obtain an AvailableVariables function that first checks this instance and then checks the supplied instance.

Parameters:

next - the next AvailableVariables instance to check

Returns:

the new AvailableVariables function that combines both instances; never null but may be this instance if next is null or