/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jbpm.configuration;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.w3c.dom.Element;

import org.jbpm.JbpmException;
import org.jbpm.util.XmlUtil;

public class BeanInfo extends AbstractObjectInfo {

  private static final long serialVersionUID = 1L;

  private String className;
  private ConstructorInfo constructorInfo;
  private FieldInfo[] fieldInfos;
  private PropertyInfo[] propertyInfos;

  public BeanInfo() {
  }

  public BeanInfo(Element beanElement, ObjectFactoryParser objectFactoryParser) {
    super(beanElement, objectFactoryParser);

    // parse constructor or factory
    Element constructorElement = XmlUtil.element(beanElement, "constructor");
    if (constructorElement != null) {
      if (beanElement.hasAttribute("class") && !constructorElement.hasAttribute("class")) {
        constructorElement.setAttribute("class", beanElement.getAttribute("class"));
      }
      constructorInfo = new ConstructorInfo(constructorElement, objectFactoryParser);
    }
    else if (beanElement.hasAttribute("class")) {
      className = beanElement.getAttribute("class");
    }
    else {
      throw new JbpmException("missing class attribute or constructor subelement in bean");
    }

    // parse fields
    List fieldInfoList = new ArrayList();
    for (Iterator iter = XmlUtil.elementIterator(beanElement, "field"); iter.hasNext();) {
      Element fieldElement = (Element) iter.next();
      fieldInfoList.add(new FieldInfo(fieldElement, objectFactoryParser));
    }
    fieldInfos = (FieldInfo[]) fieldInfoList.toArray(new FieldInfo[fieldInfoList.size()]);

    // parse properties
    List propertyInfoList = new ArrayList();
    for (Iterator iter = XmlUtil.elementIterator(beanElement, "property"); iter.hasNext();) {
      Element propertyElement = (Element) iter.next();
      propertyInfoList.add(new PropertyInfo(propertyElement, objectFactoryParser));
    }
    propertyInfos = (PropertyInfo[]) propertyInfoList.toArray(new PropertyInfo[propertyInfoList.size()]);
  }

  public Object createObject(ObjectFactoryImpl objectFactory) {
    Object object;

    if (constructorInfo == null) {
      if (className == null) {
        throw new JbpmException("bean '" + getName()
          + "' does not specify a class or constructor");
      }
      try {
        Class clazz = objectFactory.classForName(className);
        try {
          object = clazz.newInstance();
        }
        catch (InstantiationException e) {
          throw new JbpmException("failed to instantiate " + clazz, e);
        }
        catch (IllegalAccessException e) {
          throw new JbpmException(getClass() + " has no access to " + clazz, e);
        }
      }
      catch (ClassNotFoundException e) {
        throw new JbpmException("bean '" + getName() + "' specifies a missing class", e);
      }
    }
    else {
      object = constructorInfo.createObject(objectFactory);
    }

    if (className == null) {
      className = object.getClass().getName();
    }

    if (fieldInfos != null) {
      for (int i = 0; i < fieldInfos.length; i++) {
        fieldInfos[i].injectProperty(object, objectFactory);
      }
    }

    if (propertyInfos != null) {
      for (int i = 0; i < propertyInfos.length; i++) {
        propertyInfos[i].injectProperty(object, objectFactory);
      }
    }

    return object;
  }

  public String getClassName() {
    return className;
  }

  public void setClassName(String className) {
    this.className = className;
  }
}