org.aksw.sparqlify.sparqlview.SparqlViewInstance Maven / Gradle / Ivy
package org.aksw.sparqlify.sparqlview;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.aksw.commons.collections.multimaps.IBiSetMultimap;
import org.aksw.jena_sparql_api.restriction.RestrictionImpl;
import org.aksw.jena_sparql_api.views.SparqlView;
import org.aksw.jena_sparql_api.views.TwoWayBinding;
import org.aksw.jena_sparql_api.views.VarDef;
import org.apache.jena.graph.Node;
import org.apache.jena.sparql.core.Quad;
import org.apache.jena.sparql.core.QuadPattern;
import org.apache.jena.sparql.core.Var;
import org.apache.jena.sparql.expr.E_Equals;
import org.apache.jena.sparql.expr.Expr;
import org.apache.jena.sparql.expr.ExprVar;
import org.apache.jena.sparql.expr.NodeValue;
import com.google.common.collect.BiMap;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.SetMultimap;
public class SparqlViewInstance
extends ViewInstanceOld
{
private SparqlView instance; // The substituted view
private SparqlView parent; // The view this instance was created from
public SparqlViewInstance(Quad queryQuad, Quad viewQuad, int instanceId, int subId, SparqlView parent, TwoWayBinding binding)
{
super(queryQuad, viewQuad, instanceId, subId, binding);
this.parent = parent;
if(true) {
throw new RuntimeException("If we come here, we need to fix the following line");
}
//this.renamer = RdfViewSystemOld.createVariableMappingInstance(parent, instanceId);
// TODO ugly copying
this.binding = binding.copySubstitute(renamer);
this.instance = parent.copySubstitute(renamer);
}
public SparqlViewInstance copy() {
return new SparqlViewInstance(queryQuad, viewQuad, instanceId, subId, parent, binding.copySubstitute(null));
}
public SparqlView getInstance()
{
return instance;
}
public SparqlView getParent()
{
return parent;
}
/**
* For a view variable, return its defining SQL expression.
*
* @param var
* @return
*/
public Expr getDefiningExpr(Var var) {
Node parentName = renamer.inverse().get(var);
return parent.getBinding().get(parentName);
}
/**
* For a query variable, get all defining expressions,
* taking equivalences into account
*
* The question is, whether it makes sense to
* also treat constants as defining expressions.
*
* I guess yes, since a view quad such as
* ?s rdf:type ?o
* could be rewritten as
* ?s ?p ?o . with ?p = rdf:type
*
*
* @param var
* @return
*/
public List getInferredDefiningExprs(Var var) {
List result = new ArrayList();
for(Var e : binding.getEquiMap().getEquivalences(var, true)) {
Expr definingExpr = getDefiningExpr(e);
if(definingExpr != null) {
result.add(definingExpr);
}
}
Node constant = binding.getEquiMap().getKeyToValue().get(var);
if(constant != null) {
result.add(new E_Equals(new ExprVar(var), NodeValue.makeNode(constant)));
}
return result;
}
public boolean isViewVariable(Var var) {
return var.getName().startsWith("view");
}
/**
* Returns a map from query level to the parent, so the instance level
* is omitted.
*
*
* @return
*/
public SetMultimap getQueryToParentBinding()
{
SetMultimap result = HashMultimap.create();
for(Entry entry : binding.getEquiMap().getEquivalences().entries()) {
Var back = (Var)renamer.inverse().get(entry.getValue());
if(back == null) {
continue;
}
result.put(entry.getKey(), back);
}
return result;
}
/**
* How the query variables map to the parent view
* Given a query with var a, and a virtual graph with ?s:
*
* e.g. {?view1_s=[?a]}
*
*
* @return
*/
public SetMultimap getParentToQueryBinding()
{
SetMultimap result = HashMultimap.create();
for(Entry entry : binding.getEquiMap().getEquivalences().entries()) {
Var back = (Var)renamer.inverse().get(entry.getValue());
if(back == null) {
continue;
}
result.put(back, entry.getKey());
}
return result;
}
public QuadPattern getQueryQuads()
{
return queryQuads;
}
public QuadPattern getViewQuads()
{
return viewQuads;
}
public Quad getQueryQuad()
{
return queryQuad;
}
public Quad getViewQuad()
{
return queryQuad;
}
public int getInstanceId()
{
return instanceId;
}
public BiMap getRenamer()
{
return renamer;
}
public TwoWayBinding getBinding()
{
return binding;
}
public Multimap getSqlBinding()
{
Multimap result = HashMultimap.create();
Map parentBinding = parent.getBinding();
for(Entry entry : parentBinding.entrySet()) {
Var node = (Var)renamer.get(entry.getKey());
RestrictionImpl r = parent.getRestrictions().getRestriction((Var)entry.getKey());
IBiSetMultimap reverse = binding.getEquiMap().getEquivalences().getInverse();
Set queryVars = reverse.get(node);
for(Var queryVar : queryVars) {
result.put(queryVar, new VarDef(entry.getValue(), r));
}
}
return result;
}
/*
public Multimap getSqlBinding()
{
Multimap result = HashMultimap.create();
Map parentBinding = parent.getBinding();
for(Entry entry : parentBinding.entrySet()) {
Node node = renamer.get(entry.getKey());
IBiSetMultimap reverse = binding.getEquiMap().getEquivalences().getInverse();
Set queryVars = reverse.get(node);
for(Var queryVar : queryVars) {
result.put(queryVar, entry.getValue());
}
}
return result;
}
*/
@Override
public String toString()
{
//return "ViewBinding\n\tview=" + instance +"\n\tquad=" + queryQuad + "\n\tbinding=" + binding;
return parent.getName() + " " + queryQuad + " " + binding;
//return "ViewBinding\n\t" + instance +"\n\t" + queryQuad + "\n\t" + binding;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + instanceId;
result = prime * result + ((parent == null) ? 0 : parent.hashCode());
result = prime * result + subId;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
SparqlViewInstance other = (SparqlViewInstance) obj;
if (instanceId != other.instanceId)
return false;
if (parent == null) {
if (other.parent != null)
return false;
} else if (!parent.equals(other.parent))
return false;
if (subId != other.subId)
return false;
return true;
}
}
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