Package org.apache.nemo.common

Class StateMachine.Builder

java.lang.Object

org.apache.nemo.common.StateMachine.Builder

Enclosing class:

StateMachine

public static final class StateMachine.Builder
extends java.lang.Object

Builder that builds a StateMachine.

Method Summary

Modifier and Type	Method	Description
StateMachine.Builder	addState(java.lang.Enum stateEnum, java.lang.String description)	Adds a state with name and description.
StateMachine.Builder	addTransition(java.lang.Enum from, java.lang.Enum to, java.lang.String description)	Adds a transition with description.
StateMachine	build()	Builds and returns the StateMachine.
StateMachine.Builder	setInitialState(java.lang.Enum stateToSet)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

addState

public StateMachine.Builder addState(java.lang.Enum stateEnum,
                                     java.lang.String description)

Adds a state with name and description.

Parameters:

stateEnum - enumeration indicating the state

description - description of the state

Returns:

the builder

Throws:

java.lang.RuntimeException - if the state was already added

setInitialState

public StateMachine.Builder setInitialState(java.lang.Enum stateToSet)

Parameters:

stateToSet - the initial state for StateMachine

Returns:

the builder

Throws:

java.lang.RuntimeException - if the initial state was not added first

addTransition

public StateMachine.Builder addTransition(java.lang.Enum from,
                                          java.lang.Enum to,
                                          java.lang.String description)

Adds a transition with description.

Parameters:

from - from state name

to - to state name

description - description of the transition

Returns:

the builder

Throws:

java.lang.RuntimeException - if either from or to state was not added, or the same transition was already added

build

public StateMachine build()

Builds and returns the StateMachine.

Returns:

the StateMachine

Throws:

java.lang.RuntimeException - if an initial state was not set