/*
* Copyright 2016 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.statemachine.config.model;
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.DefaultResourceLoader;
import org.springframework.core.io.ResourceLoader;
import org.springframework.statemachine.action.Action;
import org.springframework.statemachine.guard.Guard;
import org.springframework.util.Assert;
/**
* Base implementation of a {@link StateMachineModelFactory} providing
* some common grounds for various implementations.
*
* This factory is able to resolve {@link Action}s or {@link Guard}s either from
* a {@link BeanFactory} if knows, or from manually registered instances. Manually
* registered actions or guards are needed if those are not created as beans or if
* whole state machine is working outside of an application context.
*
* @author Janne Valkealahti
*
* @param <S> the type of state
* @param <E> the type of event
*/
public abstract class AbstractStateMachineModelFactory<S, E>
implements StateMachineComponentResolver<S, E>, StateMachineModelFactory<S, E>, BeanFactoryAware, ResourceLoaderAware {
private BeanFactory beanFactory;
private ResourceLoader resourceLoader = new DefaultResourceLoader();
private StateMachineComponentResolver<S, E> stateMachineComponentResolver;
private final DefaultStateMachineComponentResolver<S, E> internalResolver = new DefaultStateMachineComponentResolver<S, E>();
/**
* Instantiates a new abstract state machine model factory.
*/
public AbstractStateMachineModelFactory() {
}
/**
* Instantiates a new abstract state machine model factory.
*
* @param resourceLoader the resource loader
* @param stateMachineComponentResolver the state machine component resolver
*/
public AbstractStateMachineModelFactory(ResourceLoader resourceLoader,
StateMachineComponentResolver<S, E> stateMachineComponentResolver) {
this.resourceLoader = resourceLoader;
this.stateMachineComponentResolver = stateMachineComponentResolver;
}
@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
this.beanFactory = beanFactory;
internalResolver.setBeanFactory(beanFactory);
}
@Override
public void setResourceLoader(ResourceLoader resourceLoader) {
Assert.notNull(resourceLoader, "resourceLoader cannot be null");
this.resourceLoader = resourceLoader;
}
@Override
public StateMachineModel<S, E> build(String machineId) {
return build();
}
@Override
public abstract StateMachineModel<S, E> build();
/**
* Sets the state machine component resolver.
*
* @param stateMachineComponentResolver the state machine component resolver
*/
public void setStateMachineComponentResolver(StateMachineComponentResolver<S, E> stateMachineComponentResolver) {
this.stateMachineComponentResolver = stateMachineComponentResolver;
}
/**
* Register {@link Action} into factory with a given id.
*
* @param id the id
* @param action the action
*/
public void registerAction(String id, Action<S, E> action) {
internalResolver.registerAction(id, action);
}
/**
* Register {@link Guard} into factory with a given id.
*
* @param id the id
* @param guard the guard
*/
public void registerGuard(String id, Guard<S, E> guard) {
internalResolver.registerGuard(id, guard);
}
/**
* Gets the state machine component resolver.
*
* @return the state machine component resolver
*/
public StateMachineComponentResolver<S, E> getStateMachineComponentResolver() {
return stateMachineComponentResolver;
}
/**
* Resolve action.
*
* @param id the id
* @return the action
*/
public Action<S, E> resolveAction(String id) {
Action<S, E> a = internalResolver.resolveAction(id);
if (a == null && stateMachineComponentResolver != null) {
a = stateMachineComponentResolver.resolveAction(id);
}
if (a == null) {
throw new RuntimeException("Can't resolve action with id " + id + " either from registered actions nor beanfactory");
}
return a;
}
/**
* Resolve guard.
*
* @param id the id
* @return the guard
*/
public Guard<S, E> resolveGuard(String id) {
Guard<S, E> a = internalResolver.resolveGuard(id);
if (a == null && stateMachineComponentResolver != null) {
a = stateMachineComponentResolver.resolveGuard(id);
}
if (a == null) {
throw new RuntimeException("Can't resolve guard with id " + id + " either from registered guards nor beanfactory");
}
return a;
}
/**
* Gets the bean factory.
*
* @return the bean factory
*/
protected final BeanFactory getBeanFactory() {
return beanFactory;
}
/**
* Gets the resource loader.
*
* @return the resource loader
*/
protected ResourceLoader getResourceLoader() {
return resourceLoader;
}
}