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package com.github.lontime.extspring.impl.copper;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

import org.copperengine.core.AbstractDependencyInjector;
import org.copperengine.core.persistent.SavepointAware;

/**
 * Connects SPRING to COPPER. Enables COPPER to inject dependencies into workflow instances using a spring
 * container/context.
 *
 * @author austermann
 * @since 1.0
 */
public class SpringDependencyInjector extends AbstractDependencyInjector implements ApplicationContextAware {

    private ApplicationContext context;

    public SpringDependencyInjector() {
    }

    public SpringDependencyInjector(ApplicationContext context) {
        this.context = context;
    }

    @Override
    public String getType() {
        return "SPRING";
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        context = applicationContext;
    }

    @Override
    protected Object getBean(String beanId) {
        Object firsttry = context.getBean(beanId);
        if (firsttry instanceof SavepointAware) {
            Object secondtry = context.getBean(beanId);
            if (firsttry == secondtry) {
                throw new IllegalStateException(beanId + " scope is not prototype");
            }
        }
        return firsttry;
    }

}