ConstrainedUtils.java

/*
 * Copyright 2004 Geert Bevin <gbevin[remove] at uwyn dot com>
 *
 * $Id: ConstrainedUtils.java 3750 2007-05-12 15:05:53Z gbevin $
 */
package com.uwyn.rife.site;

import com.uwyn.rife.tools.BeanUtils;
import com.uwyn.rife.tools.ClassUtils;
import com.uwyn.rife.tools.exceptions.BeanUtilsException;
import java.util.Iterator;

public class ConstrainedUtils
{
	public static Constrained getConstrainedInstance(Class beanClass)
	{
		if (null == beanClass)
		{
			return null;
		}
		
		Constrained constrained = null;
		if (Constrained.class.isAssignableFrom(beanClass))
		{
			try
			{
				constrained = (Constrained)beanClass.newInstance();
			}
			catch (Throwable e)
			{
				return null;
			}
		}
		
		return constrained;
	}

	public static Constrained makeConstrainedInstance(Object bean)
	{
		if (null == bean)
		{
			return null;
		}
		
		Constrained constrained = null;
		if (bean instanceof Constrained)
		{
			constrained = (Constrained)bean;
		}

		return constrained;
	}
	
	public static ConstrainedProperty getConstrainedProperty(Object bean, String name)
	{
		if (null == bean)
		{
			return null;
		}
		
		Constrained constrained = ConstrainedUtils.makeConstrainedInstance(bean);
		ConstrainedProperty contrained_property = null;
		if (constrained != null)
		{
			contrained_property = constrained.getConstrainedProperty(name);
		}
		
		return contrained_property;
	}
	
	public static String getIdentityProperty(Class beanClass)
	{
		String identity_property = null;
			
		Constrained constrained_bean = getConstrainedInstance(beanClass);
		if (constrained_bean != null)
		{
			Iterator<ConstrainedProperty> properties_it = constrained_bean.getConstrainedProperties().iterator();
			ConstrainedProperty property;
			while (properties_it.hasNext())
			{
				property = properties_it.next();
				if (property.isIdentifier())
				{
					identity_property = property.getPropertyName();
					break;
				}
			}
		}
		
		if (null == identity_property)
		{
			identity_property = "id";
		}
		
		return identity_property;
	}

	public static boolean editConstrainedProperty(Constrained bean, String propertyName, String prefix)
	{
		if (null == bean)
		{
			return true;
		}
		
		if (prefix != null &&
			propertyName.startsWith(prefix))
		{
			propertyName = propertyName.substring(prefix.length());
		}
		
		ConstrainedProperty	constrained_property = bean.getConstrainedProperty(propertyName);

		return !(constrained_property != null &&
				 !constrained_property.isEditable());
	}

	public static boolean persistConstrainedProperty(Constrained bean, String propertyName, String prefix)
	{
		if (null == bean)
		{
			return true;
		}
		
		if (prefix != null &&
			propertyName.startsWith(prefix))
		{
			propertyName = propertyName.substring(prefix.length());
		}
		
		ConstrainedProperty	constrained_property = bean.getConstrainedProperty(propertyName);
		if (constrained_property != null)
		{
			if (!constrained_property.isPersistent() ||
				constrained_property.isSameAs() ||
				constrained_property.hasManyToOneAssociation() ||
				constrained_property.hasManyToMany() ||
				constrained_property.hasManyToManyAssociation())
			{
				return false;
			}
			
			if (constrained_property.hasManyToOne() &&
				!isManyToOneJoinProperty(bean.getClass(), propertyName))
			{
				return false;
			}
		}
		
		return true;
	}
	
	private static boolean isManyToOneJoinProperty(Class beanClass, String propertyName)
	{
		try
		{
			Class property_type = BeanUtils.getPropertyType(beanClass, propertyName);
			if (ClassUtils.isBasic(property_type))
			{
				return true;
			}
		}
		catch (BeanUtilsException e)
		{
			return true;
		}
		
		return false;
	}
	
	public static boolean saveConstrainedProperty(Constrained bean, String propertyName, String prefix)
	{
		if (null == bean)
		{
			return true;
		}
		
		if (prefix != null &&
			propertyName.startsWith(prefix))
		{
			propertyName = propertyName.substring(prefix.length());
		}
		
		ConstrainedProperty	constrained_property = bean.getConstrainedProperty(propertyName);
		if (constrained_property != null)
		{
			if (!constrained_property.isPersistent() ||
				!constrained_property.isSaved() ||
				constrained_property.isSameAs() ||
				constrained_property.hasManyToOneAssociation() ||
				constrained_property.hasManyToMany() ||
				constrained_property.hasManyToManyAssociation())
			{
				return false;
			}
			
			if (constrained_property.hasManyToOne() &&
				!isManyToOneJoinProperty(bean.getClass(), propertyName))
			{
				return false;
			}
		}
		
		return true;
	}
	
	public static boolean fileConstrainedProperty(Constrained bean, String propertyName, String prefix)
	{
		if (null == bean)
		{
			return false;
		}
		
		if (prefix != null &&
			propertyName.startsWith(prefix))
		{
			propertyName = propertyName.substring(prefix.length());
		}
		
		ConstrainedProperty	constrained_property = bean.getConstrainedProperty(propertyName);

		return constrained_property != null && constrained_property.isFile();
	}
}