Support resource loader in UmlStateMachineModelFactory

- Fixes #200

spring-statemachine-core/src/main/java/org/springframework/statemachine/config/model/AbstractStateMachineModelFactory.java

@@ -21,6 +21,8 @@ import java.util.Map;
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.BeanFactoryAware;
+import org.springframework.context.ResourceLoaderAware;
+import org.springframework.core.io.ResourceLoader;
 import org.springframework.statemachine.action.Action;
 import org.springframework.statemachine.guard.Guard;
 
@@ -38,9 +40,10 @@ import org.springframework.statemachine.guard.Guard;
  * @param <S> the type of state
  * @param <E> the type of event
  */
-public abstract class AbstractStateMachineModelFactory<S, E> implements StateMachineComponentResolver<S, E>, BeanFactoryAware {
+public abstract class AbstractStateMachineModelFactory<S, E> implements StateMachineComponentResolver<S, E>, BeanFactoryAware, ResourceLoaderAware {
 
 	private BeanFactory beanFactory;
+	private ResourceLoader resourceLoader;
 	private final Map<String, Action<S, E>> registeredActions = new HashMap<>();
 	private final Map<String, Guard<S, E>> registeredGuards = new HashMap<>();
 
@@ -49,6 +52,11 @@ public abstract class AbstractStateMachineModelFactory<S, E> implements StateMac
 		this.beanFactory = beanFactory;
 	}
 
+	@Override
+	public void setResourceLoader(ResourceLoader resourceLoader) {
+		this.resourceLoader = resourceLoader;
+	}
+
 	/**
 	 * Register {@link Action} into factory with a given id.
 	 *
@@ -78,6 +86,15 @@ public abstract class AbstractStateMachineModelFactory<S, E> implements StateMac
 		return beanFactory;
 	}
 
+	/**
+	 * Gets the resource loader.
+	 *
+	 * @return the resource loader
+	 */
+	protected ResourceLoader getResourceLoader() {
+		return resourceLoader;
+	}
+
 	/**
 	 * Resolve action.
 	 *