package jadex.base.service.remote.xml;

import jadex.base.service.remote.RemoteReferenceModule;
import jadex.bridge.IComponentIdentifier;
import jadex.commons.IRemotable;
import jadex.commons.SReflect;
import jadex.xml.IContext;
import jadex.xml.IPreProcessor;

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

/**
 *  Preprocessor for RMI. It replaces IProxyable objects with ProxyInfo objects.
 */
public class RMIPreProcessor implements IPreProcessor
{
	//-------- attributes --------
	
	/** The remote reference module. */
	protected RemoteReferenceModule rrm;
	
	//-------- constructors --------
	
	/**
	 *  Create a new pre processor.
	 */
	public RMIPreProcessor(RemoteReferenceModule rrm)
	{
		this.rrm = rrm;
	}
	
	//-------- methods --------

	/**
	 *  Pre-process an object after an XML has been loaded.
	 *  @param context The context.
	 *  @param object The object to post process.
	 *  @return A possibly other object for replacing the original. 
	 *  		Null for no change.
	 *  		Only possibly when processor is applied in first pass.
	 */
	public Object preProcess(IContext context, Object object)
	{
		Class[] remoteinterfaces = getRemoteInterfaces(object);
		
		if(remoteinterfaces.length==0)
			throw new RuntimeException("Proxyable object has no remote references: "+object);

		object = rrm.getProxyReference(object, remoteinterfaces, (IComponentIdentifier)context.getUserContext());
		
		return object;
	}
	
	/**
	 *  Get the proxy interface (null if none).
	 */
	protected Class[] getRemoteInterfaces(Object object)
	{
		List ret = new ArrayList();
		
		if(object!=null)
		{
			Class clazz = object.getClass();
			while(clazz!=null)
			{
				Class[] interfaces = clazz.getInterfaces();
				for(int i=0; i<interfaces.length; i++)
				{
					if(SReflect.isSupertype(IRemotable.class, interfaces[i]))
						ret.add(interfaces[i]);
				}
				clazz = clazz.getSuperclass();
			}
		}
		
		return (Class[])ret.toArray(new Class[ret.size()]);
	}
}