/*
 * 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.runtime.config.spring.parsers;

import org.mule.runtime.core.util.ClassUtils;
import org.mule.runtime.core.util.StringUtils;

import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.xml.AbstractBeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.w3c.dom.Element;

public class ClassOrRefDefinitionParser extends AbstractBeanDefinitionParser {

  private String propertyName;

  public ClassOrRefDefinitionParser(String propertyName) {
    super();

    if (StringUtils.isEmpty(propertyName)) {
      throw new IllegalArgumentException("propertyName cannot be null");
    }
    this.propertyName = propertyName;
  }

  @Override
  protected AbstractBeanDefinition parseInternal(Element element, ParserContext parserContext) {
    MutablePropertyValues parentProps = parserContext.getContainingBeanDefinition().getPropertyValues();

    String ref = element.getAttribute(AbstractMuleBeanDefinitionParser.ATTRIBUTE_REF);
    String className = element.getAttribute(AbstractMuleBeanDefinitionParser.ATTRIBUTE_CLASS);

    if (StringUtils.isBlank(ref) && StringUtils.isBlank(className)) {
      String elementName = element.getLocalName();
      throw new IllegalArgumentException("Neither ref nor class attribute specified for the " + elementName + " element");
    }

    if (StringUtils.isNotBlank(ref)) {
      // add a ref to other bean
      parentProps.addPropertyValue(propertyName, new RuntimeBeanReference(ref));
    } else {
      // class attributed specified, instantiate and set directly
      Object instance;
      try {
        instance = ClassUtils.instanciateClass(className, ClassUtils.NO_ARGS, getClass());
      } catch (Exception e) {
        throw new RuntimeException(e);
      }

      parentProps.addPropertyValue(propertyName, instance);
    }

    return null;
  }
}