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Mule Builder for use with Spring 2.X Namespace based XML configuration.

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/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.config.spring;

import org.mule.api.MuleContext;
import org.mule.api.config.ConfigurationException;
import org.mule.api.lifecycle.Initialisable;
import org.mule.api.registry.Registry;
import org.mule.config.builders.AbstractConfigurationBuilder;
import org.mule.config.i18n.MessageFactory;

import org.springframework.context.ApplicationContext;
import org.springframework.context.ConfigurableApplicationContext;

/**
 * Adds an existing Spring ApplicationContext to Mule's internal collection of Registries.
 */
public class SpringConfigurationBuilder extends AbstractConfigurationBuilder
{
    private ApplicationContext appContext;

    private ApplicationContext parentContext;
    
    public SpringConfigurationBuilder(ApplicationContext appContext)
    {
        this.appContext = appContext;
    }

    public SpringConfigurationBuilder(ConfigurableApplicationContext appContext, ApplicationContext parentContext)
    {
        this.appContext = appContext;
        this.parentContext = parentContext;
    }

    protected void doConfigure(MuleContext muleContext) throws Exception
    {
        Registry registry;
        
        if (parentContext != null)
        {
            if (appContext instanceof ConfigurableApplicationContext)
            {
                registry = new SpringRegistry((ConfigurableApplicationContext) appContext, parentContext, muleContext);
            }
            else
            {
                throw new ConfigurationException(MessageFactory.createStaticMessage("Cannot set a parent context if the ApplicationContext does not implement ConfigurableApplicationContext"));
            }
        }
        else
        {
            registry = new SpringRegistry(appContext, muleContext);
        }

        // Note: The SpringRegistry must be created before applicationContext.refresh() gets called because
        // some beans may try to look up other beans via the Registry during preInstantiateSingletons().
        muleContext.addRegistry(registry);
        if (muleContext.getLifecycleManager().isPhaseComplete(Initialisable.PHASE_NAME))
        {
            registry.initialise();
        }
    }

}