import com.hp.hpl.jena.graph.query.Query; //导入依赖的package包/类
public BindingQueryPlan prepareBindings(Query q, Node[] variables) {   
	this.variables = variables;
	this.indexes = new HashMap<Node,Integer>();
	for (int i = 0; i < variables.length; i++) {
		indexes.put(variables[i], new Integer(i));
	}
	BasicPattern pattern = new BasicPattern();
	for (Triple t: q.getPattern()) {
		pattern.add(t);
	}
	Plan plan = QueryEngineD2RQ.getFactory().create(new OpBGP(pattern), dataset, null, null);
	final ExtendedIterator<Domain> queryIterator = new Map1Iterator<Binding,Domain>(new BindingToDomain(), plan.iterator());
	return new BindingQueryPlan() {
		public ExtendedIterator<Domain> executeBindings() {
			return queryIterator;
		}
	};
}
 

import com.hp.hpl.jena.graph.query.Query; //导入依赖的package包/类
/**
 * <p>Method that prepares the bindings for a query plan</p>
 * @param q - the input query
 * @param variables - the variables in the given query
 * @return a binding query plan
 * 
 * @see de.fuberlin.wiwiss.d2rq.D2RQQueryHandler#prepareBindings(Query, Node[])
 */
@SuppressWarnings("unchecked")
public BindingQueryPlan prepareBindings(Query q, Node[] variables) 
{   
	this.variables = variables;
	this.indexes = new HashMap();
	for (int i = 0; i < variables.length; i++) { indexes.put(variables[i], new Integer(i)); }
	BasicPattern pattern = new BasicPattern();
	Iterator it = q.getPattern().iterator();
	while (it.hasNext()) 
	{
		Triple t = (Triple) it.next();
		pattern.add(t);
	}
	Plan plan = QueryEngineD2RQ.getFactory().create(new OpBGP(pattern), dataset, null, null);
	final ExtendedIterator queryIterator = new Map1Iterator(new BindingToDomain(), plan.iterator());
	return new BindingQueryPlan() 
	{
		public ExtendedIterator executeBindings() { return queryIterator; }
	};
}
 

import com.hp.hpl.jena.graph.query.Query; //导入依赖的package包/类
public BindingQueryPlanMulgara(org.mulgara.query.Query query,
                               Session session,
                               List<Variable> proj) {
  this.query = query ;
  this.session = session ;
  this.projection = proj ;
}
 

import com.hp.hpl.jena.graph.query.Query; //导入依赖的package包/类
/**
	this nodeToElement is pretty much identical to that of
	graph.query.patternstagecompiler.compile.
*/
private Element nodeToElement( Node X, Mapping map )
	{
	if (X.equals( Query.ANY )) return Element.ANY;
	if (X.isVariable()) {
		if (map.hasBound(X))
			return new Bound (map.indexOf(X));
		else {
			freeVarCnt++;
			return new Free( X );
		}
	}
	return new Fixed( X );
	}