package com.nesterovskyBros.jsf;

import java.util.List;
import java.util.Map;

import javax.el.BeanELResolver;
import javax.el.ELContext;

/**
 * Resolves properties of types 
 * java.sql.Date, java.sql.Time, java.sql.Timestamp.
 * The property type is coersed to java.util.Date to be able to 
 * work with date converters.
 */
public class DateELResolver extends BeanELResolver
{
  /**
   * Creates a new read/write DateELResolver.
   */
  public DateELResolver()
  {
  }

  /**
   * {@inheritDoc} 
   */
  @SuppressWarnings("unchecked")
  @Override
  public Class getType(ELContext context, Object base, Object property)
  {
    if ((base == null) || (base instanceof List) || (base instanceof Map))
    {
      return null;
    }
    
    Class propertyClass = super.getType(context, base, property);
    
    if 
    (
      (propertyClass == null) || 
      !context.isPropertyResolved() ||
      (
        (propertyClass != java.sql.Date.class) &&
        (propertyClass != java.sql.Time.class) &&
        (propertyClass != java.sql.Timestamp.class)
      )
    )
    {
      context.setPropertyResolved(false);

      return null;
    }
    
    return java.util.Date.class;
  }
  
  /**
   * {@inheritDoc} 
   */
  @Override
  public Object getValue(
    ELContext context, 
    Object base, 
    Object property)
  {
    Class<?> propertyClass = getType(context, base, property);
    
    if ((propertyClass == null) || !context.isPropertyResolved())
    {
      return null;
    }

    context.setPropertyResolved(false);

    return super.getValue(context, base, property); 
  }

  /**
   * {@inheritDoc} 
   */
  @Override
  public void setValue(
    ELContext context, 
    Object base, 
    Object property, 
    Object value)
  {
    if ((base == null) || (base instanceof List) || (base instanceof Map))
    {
      context.setPropertyResolved(false);

      return;
    }

    Class<?> propertyClass = super.getType(context, base, property);
    
    if 
    (
      (propertyClass == null) || 
      !context.isPropertyResolved() ||
      !(value instanceof java.util.Date)
    )
    {
      context.setPropertyResolved(false);

      return;
    }
    
    java.util.Date date = (java.util.Date)value;

    context.setPropertyResolved(false);

    if (propertyClass == java.sql.Date.class)
    {
      value = date == null ? null : new java.sql.Date(date.getTime());
    }
    else if (propertyClass == java.sql.Time.class)
    {
      value = date == null ? null : new java.sql.Time(date.getTime());
    }
    else if (propertyClass == java.sql.Timestamp.class)
    {
      value = date == null ? null : new java.sql.Timestamp(date.getTime());
    }
    else
    {
      return;
    }
    
    super.setValue(context, base, property, value);
  }
}