package org.gcube.common.clients.gcore.queries;

import org.apache.axis.message.addressing.EndpointReferenceType;
import org.gcube.common.clients.cache.DefaultEndpointCache;
import org.gcube.common.clients.cache.EndpointCache;
import org.gcube.common.clients.gcore.plugins.Plugin;
import org.gcube.common.clients.gcore.plugins.PluginAdapter;
import org.gcube.common.clients.queries.AbstractQuery;
import org.gcube.common.clients.queries.Query;

/**
 * Partial implementation of {@link Query}s for gCore services.
 * 
 * @author Fabio Simeoni
 *
 * @param <R> the type of query results
 */
public abstract class GCoreQuery<R> extends AbstractQuery<EndpointReferenceType, R> {

	public static EndpointCache<EndpointReferenceType> globalCache = new DefaultEndpointCache<EndpointReferenceType>();
	
	private final ISFacade facade;
	
	/**
	 * Creates an instance with a {@link ISFacade}, a {@link PluginAdapter}, and a type of IS queries
	 * @param facade the facade
	 * @param plugin the plugin
	 * @param queryClass the query type
	 */
	protected GCoreQuery(ISFacade facade, Plugin<?,?> plugin) {
		super(plugin);
		
		this.facade=facade;
		
		//adds systematically base conditions
		addCondition("//ServiceName", plugin.serviceName());
		addCondition("//ServiceClass", plugin.serviceClass());
	}
	
	/**
	 * Returns the {@link ISFacade} used for query execution.
	 * @return the facade
	 */
	protected ISFacade facade() {
		return facade;
	}
}