package org.simantics.g3d.objmap.schema;

//import org.apache.log4j.Logger;
import org.eclipse.core.runtime.IAdaptable;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.WriteGraph;
import org.simantics.db.exception.DatabaseException;
import org.simantics.objmap.IFunction;
import org.simantics.objmap.ILinkType;
import org.simantics.objmap.MappingException;

/**
 * A link type that is associated with adaptable resource (ReadGraph.getAdapter(Resource,Class)). 
 * The adapted object must implement IAdaptable interface for returning the original Resource. 
 * 
 * @author Marko Luukkainen <marko.luukkainen@vtt.fi>
 *
 */
public class AdaptedLinkType implements ILinkType {

	
	//static Logger LOGGER = Logger.getLogger("org.simantics.objmap");
    
    Resource domainType;
    Class<?> rangeType;
    
    
    public AdaptedLinkType(Resource domainType, Class<?> rangeType) {
        this.domainType = domainType;
        this.rangeType = rangeType;
    }
    
    @Override
    public Resource createDomainElement(WriteGraph g, Object rangeElement)
    		throws MappingException {
    	try {
    		IAdaptable adaptable = (IAdaptable)rangeElement;
    		Resource res = (Resource)adaptable.getAdapter(Resource.class);
    		if (res == null)
    			throw new NullPointerException();
    		return res;
    	} catch (Exception e) {
    		throw new MappingException("Adapted object must implement IAdaptable interface to return the source Resource.", e);
    	}
    	
    }
    
    @Override
    public Object createRangeElement(ReadGraph g, Resource domainElement)
    		throws MappingException {
    	try {
    		return g.adapt(domainElement, rangeType);
    	} catch (DatabaseException e) {
    		throw new MappingException(e);
    	}
    }
    
    @Override
    public boolean updateDomain(WriteGraph g, IFunction<Object, Resource> map,
    		Resource domainElement, Object rangeElement)
    		throws MappingException {
    	return false;
    }
    @Override
    public boolean updateRange(ReadGraph g, IFunction<Resource, Object> map,
    		Resource domainElement, Object rangeElement)
    		throws MappingException {
    	return false;
    }
}