Hook StateMachineModelFactory and StateMachineFactory together

- Change so that machine id used in StateMachineFactory
  can use same id in StateMachineModelFactory which now
  extended with method build(String machineId).
- Polish repo and jpa classes.
- Fixes #255

spring-statemachine-data/src/main/java/org/springframework/statemachine/data/RepositoryState.java

@@ -23,11 +23,24 @@ package org.springframework.statemachine.data;
  */
 public interface RepositoryState {
 
+	/**
+	 * Gets the machine id.
+	 *
+	 * @return the machine id
+	 */
+	String getMachineId();
+
+	/**
+	 * Gets the state.
+	 *
+	 * @return the state
+	 */
 	String getState();
 
-	void setState(String state);
-
+	/**
+	 * Checks if is initial.
+	 *
+	 * @return true, if is initial
+	 */
 	boolean isInitial();
-
-	void setInitial(boolean initial);
 }

spring-statemachine-data/src/main/java/org/springframework/statemachine/data/RepositoryStateMachineModelFactory.java

@@ -53,16 +53,21 @@ public class RepositoryStateMachineModelFactory implements StateMachineModelFact
 
 	@Override
 	public StateMachineModel<String, String> build() {
+		return build(null);
+	}
+
+	@Override
+	public StateMachineModel<String, String> build(String machineId) {
 		ConfigurationData<String, String> configurationData = new ConfigurationData<>();
 
 		Collection<StateData<String, String>> stateData = new ArrayList<>();
-		for (RepositoryState s : stateRepository.findAll()) {
+		for (RepositoryState s : stateRepository.findByMachineId(machineId)) {
 			stateData.add(new StateData<String, String>(s.getState(), s.isInitial()));
 		}
 		StatesData<String, String> statesData = new StatesData<>(stateData);
 
 		Collection<TransitionData<String, String>> transitionData = new ArrayList<>();
-		for (RepositoryTransition t : transitionRepository.findAll()) {
+		for (RepositoryTransition t : transitionRepository.findByMachineId(machineId)) {
 			transitionData.add(new TransitionData<String, String>(t.getSource(), t.getTarget(), t.getEvent()));
 		}
 		TransitionsData<String, String> transitionsData = new TransitionsData<>(transitionData);

spring-statemachine-data/src/main/java/org/springframework/statemachine/data/RepositoryTransition.java

@@ -23,15 +23,31 @@ package org.springframework.statemachine.data;
  */
 public interface RepositoryTransition {
 
+	/**
+	 * Gets the machine id.
+	 *
+	 * @return the machine id
+	 */
+	String getMachineId();
+
+	/**
+	 * Gets the source.
+	 *
+	 * @return the source
+	 */
 	String getSource();
 
-	void setSource(String source);
-
+	/**
+	 * Gets the target.
+	 *
+	 * @return the target
+	 */
 	String getTarget();
 
-	void setTarget(String target);
-
+	/**
+	 * Gets the event.
+	 *
+	 * @return the event
+	 */
 	String getEvent();
-
-	void setEvent(String event);
 }

spring-statemachine-data/src/main/java/org/springframework/statemachine/data/StateRepository.java

@@ -15,6 +15,8 @@
  */
 package org.springframework.statemachine.data;
 
+import java.util.List;
+
 import org.springframework.data.repository.CrudRepository;
 import org.springframework.data.repository.NoRepositoryBean;
 import org.springframework.data.repository.Repository;
@@ -28,4 +30,12 @@ import org.springframework.data.repository.Repository;
  */
 @NoRepositoryBean
 public interface StateRepository<S extends RepositoryState> extends CrudRepository<S, Long> {
+
+	/**
+	 * Find states by machine id.
+	 *
+	 * @param machineId the machine id
+	 * @return the list of transitions
+	 */
+	List<S> findByMachineId(String machineId);
 }

spring-statemachine-data/src/main/java/org/springframework/statemachine/data/TransitionRepository.java

@@ -15,6 +15,8 @@
  */
 package org.springframework.statemachine.data;
 
+import java.util.List;
+
 import org.springframework.data.repository.CrudRepository;
 import org.springframework.data.repository.NoRepositoryBean;
 import org.springframework.data.repository.Repository;
@@ -28,4 +30,12 @@ import org.springframework.data.repository.Repository;
  */
 @NoRepositoryBean
 public interface TransitionRepository<T extends RepositoryTransition> extends CrudRepository<T, Long> {
+
+	/**
+	 * Find transitions by machine id.
+	 *
+	 * @param machineId the machine id
+	 * @return the list of transitions
+	 */
+	List<T> findByMachineId(String machineId);
 }