PlaySerializer.java

package com.hp.hpl.jena.sparql.serializer;

import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.apache.jena.atlas.io.IndentedLineBuffer;

import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.sparql.util.NodeToLabelMapBNode;

import eu.play_project.play_platformservices.api.HistoricalQuery;


public class PlaySerializer extends Serializer{
	
	  /**
     * Generate historical querys dependent on the destination cloud Id.
     * @return Key: CloudID, Value: String representation of historical select query.
     */
    public static List<HistoricalQuery> serializeToMultipleSelectQueries(Query query){
        // For the query pattern
        SerializationContext cxt1 = new SerializationContext(query, new NodeToLabelMapBNode("b", false) ) ;
        // For the construct pattern
        SerializationContext cxt2 = new SerializationContext(query, new NodeToLabelMapBNode("c", false)  ) ;
        IndentedLineBuffer writer = new IndentedLineBuffer() ;
        
        HistoricalGraphFormaterElement e = new HistoricalGraphFormaterElement(writer, cxt1);
        
        serializeARQ(query, writer,
                     e,
                     new FmtExprSPARQL(writer, cxt1),
                     new FmtTemplate(writer, cxt2)) ;
		// TODO make it more efficient.

        List<HistoricalQuery> result = new LinkedList<HistoricalQuery>();
        HistoricalQuery hq = new HistoricalQuery();
        
		Map<String, String> queries = e.getHistoricalCloudQueries();
		List<String> vars = query.getResultVars(); // FIXME different values for historical query.
		vars.add("firstEvent");
		String selectString = null;

		// Add select variables
		for (String key : queries.keySet()) {
			hq = new HistoricalQuery();
			// Add preifix
			selectString = e.getPrefixNames() + "\n";
			selectString += "SELECT DISTINCT ";
			// Variables in current query.
			for (String var : vars) {
				if (queries.get(key).contains("?" + var)) {
					selectString += " ?" + var;
					//Set variables.
					hq.getVariables().add("?" + var);
				}
			}
			// Set values.
			hq.setQuery(selectString +" \n WHERE { \n" + queries.get(key) + "} ");
			hq.setCloudId(key);
			result.add(hq);
		}
		return result;
		

	}
    
 

}