URIResolverImpl.java

/**
 * (C) Copyright 2013 Jabylon (http://www.jabylon.org) and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.jabylon.common.resolver.impl;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.ReferenceCardinality;
import org.apache.felix.scr.annotations.ReferencePolicy;
import org.apache.felix.scr.annotations.Service;
import org.eclipse.emf.cdo.CDOObject;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.net4j.CDONet4jSession;
import org.eclipse.emf.cdo.view.CDOView;
import org.eclipse.emf.common.util.URI;
import org.jabylon.cdo.connector.RepositoryConnector;
import org.jabylon.common.resolver.URIHandler;
import org.jabylon.common.resolver.URIResolver;

/**
 * @author jutzig.dev@googlemail.com
 *
 */
@Component
@Service
public class URIResolverImpl implements URIResolver {

    @Reference(referenceInterface=URIHandler.class,cardinality=ReferenceCardinality.OPTIONAL_MULTIPLE,bind="addHandler",unbind="removeHandler",policy=ReferencePolicy.DYNAMIC)
    private List<URIHandler> handlers = new CopyOnWriteArrayList<URIHandler>();
    private CDONet4jSession session;
    private CDOView view;
    @Reference(cardinality=ReferenceCardinality.MANDATORY_UNARY)
    private RepositoryConnector repositoryConnector;


    public void addHandler(URIHandler handler)
    {
        handlers.add(handler);
    }

    public void removeHandler(URIHandler handler) {
        handlers.remove(handler);
    }


    /*
     * (non-Javadoc)
     *
     * @see
     * org.jabylon.common.resolver.URIResolver#resolve(org.eclipse.emf
     * .common.util.URI)
     */
    @Override
    public Object resolve(URI uri) {
        for (URIHandler handler : handlers) {
            if(handler.canHandle(uri))
            {
            	Object resolved = handler.resolve(uri);
//            	URI internal = internalGetURI(resolved);
//				if(!internal.equals(uri))
//					throw new IllegalStateException(internal + " != " + uri);
				return resolved;
            }
        }
        return null;

    }



	public URI internalGetURI(Object o) {
		for (URIHandler handler : handlers) {
			if(handler.canHandle(o))
			{
				return handler.toURI(o);
			}
		}
		return null;
	}

	@Override
	public URI getURI(Object o) {
		URI uri = internalGetURI(o);
		if(uri==null)
			return null;
		//sanity check. Can be removed later
//		Object resolved = resolve(uri);
//		if(resolved == null)
//			throw new IllegalStateException("handler is not sane");
		return uri;

	}

    /*
     * (non-Javadoc)
     *
     * @see
     * org.jabylon.common.resolver.URIResolver#resolve(java.lang.String)
     */
    @Override
    public Object resolve(String path) {
        if(path==null)
            return resolve((URI)null);
        URI uri = URI.createURI(path, true);
        return resolve(uri);
    }

    public void bindRepositoryConnector(RepositoryConnector connector) {
    	repositoryConnector = connector;
        session = connector.createSession();
        view = connector.openView(session);
    }

    public void unbindRepositoryConnector(RepositoryConnector connector) {
        view.close();
        view = null;
        session.close();
        session = null;
    }

    @Deactivate
    public void deactivate() {
        if(view!=null)
            view.close();
        if(session!=null)
            session.close();
    }

    @Override
    public CDOObject resolve(CDOID id) {
        return view.getObject(id);
    }

    @Override
    public CDOObject resolveWithTransaction(CDOID id) {
        return repositoryConnector.configureView(session.openTransaction()).getObject(id);
    }

}