import com.hp.hpl.jena.sparql.algebra.op.OpGraph; //导入依赖的package包/类
public void visit(OpGraph opGraph) {
	// TODO Pushing down might be possible
	wrapInCurrentFilterAndRecurse(opGraph);
}
 

import com.hp.hpl.jena.sparql.algebra.op.OpGraph; //导入依赖的package包/类
@Override
public void visit(OpGraph opGraph) {
	visit(opGraph.getNode());
}
 

import com.hp.hpl.jena.sparql.algebra.op.OpGraph; //导入依赖的package包/类
@Override
public Op transform(OpGraph opGraph, Op subOp) {
	return substitute(opGraph, subOp);
}
 

import com.hp.hpl.jena.sparql.algebra.op.OpGraph; //导入依赖的package包/类
@Override
public Op transform(OpGraph opGraph, Op subOp) {
	return new OpBGP();
}
 

import com.hp.hpl.jena.sparql.algebra.op.OpGraph; //导入依赖的package包/类
protected Op compileElementGraph(ElementNamedGraph eltGraph) {
    Node graphNode = eltGraph.getGraphNameNode();
    Op sub = compileElement(eltGraph.getElement());
    return new OpGraph(graphNode, sub);
}