Example #1
0
func (m *MqlQuery) buildIteratorTreeMapInternal(query map[string]interface{}, path MqlPath) (graph.Iterator, error) {
	it := graph.NewAndIterator()
	it.AddSubIterator(m.ses.ts.GetNodesAllIterator())
	var err error
	err = nil
	outputStructure := make(map[string]interface{})
	for key, subquery := range query {
		outputStructure[key] = nil
		reverse := false
		pred := key
		if strings.HasPrefix(pred, "@") {
			i := strings.Index(pred, ":")
			if i != -1 {
				pred = pred[(i + 1):]
			}
		}
		if strings.HasPrefix(pred, "!") {
			reverse = true
			pred = strings.TrimPrefix(pred, "!")
		}

		// Other special constructs here
		var subit graph.Iterator
		if key == "id" {
			subit, err = m.buildIteratorTreeInternal(subquery, path.Follow(key))
			if err != nil {
				return nil, err
			}
			it.AddSubIterator(subit)
		} else {
			subit, err = m.buildIteratorTreeInternal(subquery, path.Follow(key))
			if err != nil {
				return nil, err
			}
			subAnd := graph.NewAndIterator()
			predFixed := m.ses.ts.MakeFixed()
			predFixed.AddValue(m.ses.ts.GetIdFor(pred))
			subAnd.AddSubIterator(graph.NewLinksToIterator(m.ses.ts, predFixed, "p"))
			if reverse {
				lto := graph.NewLinksToIterator(m.ses.ts, subit, "s")
				subAnd.AddSubIterator(lto)
				hasa := graph.NewHasaIterator(m.ses.ts, subAnd, "o")
				it.AddSubIterator(hasa)
			} else {
				lto := graph.NewLinksToIterator(m.ses.ts, subit, "o")
				subAnd.AddSubIterator(lto)
				hasa := graph.NewHasaIterator(m.ses.ts, subAnd, "s")
				it.AddSubIterator(hasa)
			}
		}
	}
	if err != nil {
		return nil, err
	}
	m.queryStructure[path] = outputStructure
	return it, nil
}
Example #2
0
func TestIteratorsAndNextResultOrderA(t *testing.T) {
	ts := MakeTestingMemstore()
	fixed := ts.MakeFixed()
	fixed.AddValue(ts.GetIdFor("C"))
	all := ts.GetNodesAllIterator()
	lto := graph.NewLinksToIterator(ts, all, "o")
	innerAnd := graph.NewAndIterator()

	fixed2 := ts.MakeFixed()
	fixed2.AddValue(ts.GetIdFor("follows"))
	lto2 := graph.NewLinksToIterator(ts, fixed2, "p")
	innerAnd.AddSubIterator(lto2)
	innerAnd.AddSubIterator(lto)
	hasa := graph.NewHasaIterator(ts, innerAnd, "s")
	outerAnd := graph.NewAndIterator()
	outerAnd.AddSubIterator(fixed)
	outerAnd.AddSubIterator(hasa)
	val, ok := outerAnd.Next()
	if !ok {
		t.Error("Expected one matching subtree")
	}
	if ts.GetNameFor(val) != "C" {
		t.Errorf("Matching subtree should be %s, got %s", "barak", ts.GetNameFor(val))
	}
	expected := make([]string, 2)
	expected[0] = "B"
	expected[1] = "D"
	actualOut := make([]string, 2)
	actualOut[0] = ts.GetNameFor(all.LastResult())
	nresultOk := outerAnd.NextResult()
	if !nresultOk {
		t.Error("Expected two results got one")
	}
	actualOut[1] = ts.GetNameFor(all.LastResult())
	nresultOk = outerAnd.NextResult()
	if nresultOk {
		t.Error("Expected two results got three")
	}
	CompareStringSlices(t, expected, actualOut)
	val, ok = outerAnd.Next()
	if ok {
		t.Error("More than one possible top level output?")
	}
}
Example #3
0
func TestRemoveTriple(t *testing.T) {
	ts := MakeTestingMemstore()
	ts.RemoveTriple(graph.MakeTriple("E", "follows", "F", ""))
	fixed := ts.MakeFixed()
	fixed.AddValue(ts.GetIdFor("E"))
	lto := graph.NewLinksToIterator(ts, fixed, "s")
	fixed2 := ts.MakeFixed()
	fixed2.AddValue(ts.GetIdFor("follows"))
	lto2 := graph.NewLinksToIterator(ts, fixed2, "p")
	innerAnd := graph.NewAndIterator()
	innerAnd.AddSubIterator(lto2)
	innerAnd.AddSubIterator(lto)
	hasa := graph.NewHasaIterator(ts, innerAnd, "o")
	newIt, _ := hasa.Optimize()
	_, ok := newIt.Next()
	if ok {
		t.Error("E should not have any followers.")
	}
}
Example #4
0
func buildInOutIterator(obj *otto.Object, ts graph.TripleStore, base graph.Iterator, isReverse bool) graph.Iterator {
	argList, _ := obj.Get("_gremlin_values")
	if argList.Class() != "GoArray" {
		glog.Errorln("How is arglist not an array? Return nothing.", argList.Class())
		return graph.NewNullIterator()
	}
	argArray := argList.Object()
	lengthVal, _ := argArray.Get("length")
	length, _ := lengthVal.ToInteger()
	var predicateNodeIterator graph.Iterator
	if length == 0 {
		predicateNodeIterator = ts.GetNodesAllIterator()
	} else {
		zero, _ := argArray.Get("0")
		predicateNodeIterator = buildIteratorFromValue(zero, ts)
	}
	if length >= 2 {
		var tags []string
		one, _ := argArray.Get("1")
		if one.IsString() {
			s, _ := one.ToString()
			tags = append(tags, s)
		} else if one.Class() == "Array" {
			tags = makeListOfStringsFromArrayValue(one.Object())
		}
		for _, tag := range tags {
			predicateNodeIterator.AddTag(tag)
		}
	}

	in, out := "s", "o"
	if isReverse {
		in, out = out, in
	}
	lto := graph.NewLinksToIterator(ts, base, in)
	and := graph.NewAndIterator()
	and.AddSubIterator(graph.NewLinksToIterator(ts, predicateNodeIterator, "p"))
	and.AddSubIterator(lto)
	return graph.NewHasaIterator(ts, and, out)
}
Example #5
0
func buildIteratorTree(tree *peg.ExpressionTree, ts graph.TripleStore) graph.Iterator {
	switch tree.Name {
	case "Start":
		return buildIteratorTree(tree.Children[0], ts)
	case "NodeIdentifier":
		var out graph.Iterator
		nodeID := getIdentString(tree)
		if tree.Children[0].Name == "Variable" {
			allIt := ts.GetNodesAllIterator()
			allIt.AddTag(nodeID)
			out = allIt
		} else {
			n := nodeID
			if tree.Children[0].Children[0].Name == "ColonIdentifier" {
				n = nodeID[1:]
			}
			fixed := ts.MakeFixed()
			fixed.AddValue(ts.GetIdFor(n))
			out = fixed
		}
		return out
	case "PredIdentifier":
		i := 0
		if tree.Children[0].Name == "Reverse" {
			//Taken care of below
			i++
		}
		it := buildIteratorTree(tree.Children[i], ts)
		lto := graph.NewLinksToIterator(ts, it, "p")
		return lto
	case "RootConstraint":
		constraintCount := 0
		and := graph.NewAndIterator()
		for _, c := range tree.Children {
			switch c.Name {
			case "NodeIdentifier":
				fallthrough
			case "Constraint":
				it := buildIteratorTree(c, ts)
				and.AddSubIterator(it)
				constraintCount++
				continue
			default:
				continue
			}
		}
		return and
	case "Constraint":
		var hasa *graph.HasaIterator
		topLevelDir := "s"
		subItDir := "o"
		subAnd := graph.NewAndIterator()
		isOptional := false
		for _, c := range tree.Children {
			switch c.Name {
			case "PredIdentifier":
				if c.Children[0].Name == "Reverse" {
					topLevelDir = "o"
					subItDir = "s"
				}
				it := buildIteratorTree(c, ts)
				subAnd.AddSubIterator(it)
				continue
			case "PredicateKeyword":
				switch c.Children[0].Name {
				case "OptionalKeyword":
					isOptional = true
				}
			case "NodeIdentifier":
				fallthrough
			case "RootConstraint":
				it := buildIteratorTree(c, ts)
				l := graph.NewLinksToIterator(ts, it, subItDir)
				subAnd.AddSubIterator(l)
				continue
			default:
				continue
			}
		}
		hasa = graph.NewHasaIterator(ts, subAnd, topLevelDir)
		if isOptional {
			optional := graph.NewOptionalIterator(hasa)
			return optional
		}
		return hasa
	default:
		return &graph.NullIterator{}
	}
	panic("Not reached")
}
Example #6
0
func buildIteratorTreeHelper(obj *otto.Object, ts graph.TripleStore, base graph.Iterator) graph.Iterator {
	var it graph.Iterator
	it = base
	// TODO: Better error handling
	kindVal, _ := obj.Get("_gremlin_type")
	stringArgs := getStringArgs(obj)
	var subIt graph.Iterator
	prevVal, _ := obj.Get("_gremlin_prev")
	if !prevVal.IsObject() {
		subIt = base
	} else {
		subIt = buildIteratorTreeHelper(prevVal.Object(), ts, base)
	}

	kind, _ := kindVal.ToString()
	switch kind {
	case "vertex":
		if len(stringArgs) == 0 {
			it = ts.GetNodesAllIterator()
		} else {
			fixed := ts.MakeFixed()
			for _, name := range stringArgs {
				fixed.AddValue(ts.GetIdFor(name))
			}
			it = fixed
		}
	case "tag":
		it = subIt
		for _, tag := range stringArgs {
			it.AddTag(tag)
		}
	case "save":
		all := ts.GetNodesAllIterator()
		if len(stringArgs) > 2 || len(stringArgs) == 0 {
			return graph.NewNullIterator()
		}
		if len(stringArgs) == 2 {
			all.AddTag(stringArgs[1])
		} else {
			all.AddTag(stringArgs[0])
		}
		predFixed := ts.MakeFixed()
		predFixed.AddValue(ts.GetIdFor(stringArgs[0]))
		subAnd := graph.NewAndIterator()
		subAnd.AddSubIterator(graph.NewLinksToIterator(ts, predFixed, "p"))
		subAnd.AddSubIterator(graph.NewLinksToIterator(ts, all, "o"))
		hasa := graph.NewHasaIterator(ts, subAnd, "s")
		and := graph.NewAndIterator()
		and.AddSubIterator(hasa)
		and.AddSubIterator(subIt)
		it = and
	case "saver":
		all := ts.GetNodesAllIterator()
		if len(stringArgs) > 2 || len(stringArgs) == 0 {
			return graph.NewNullIterator()
		}
		if len(stringArgs) == 2 {
			all.AddTag(stringArgs[1])
		} else {
			all.AddTag(stringArgs[0])
		}
		predFixed := ts.MakeFixed()
		predFixed.AddValue(ts.GetIdFor(stringArgs[0]))
		subAnd := graph.NewAndIterator()
		subAnd.AddSubIterator(graph.NewLinksToIterator(ts, predFixed, "p"))
		subAnd.AddSubIterator(graph.NewLinksToIterator(ts, all, "s"))
		hasa := graph.NewHasaIterator(ts, subAnd, "o")
		and := graph.NewAndIterator()
		and.AddSubIterator(hasa)
		and.AddSubIterator(subIt)
		it = and
	case "has":
		fixed := ts.MakeFixed()
		if len(stringArgs) < 2 {
			return graph.NewNullIterator()
		}
		for _, name := range stringArgs[1:] {
			fixed.AddValue(ts.GetIdFor(name))
		}
		predFixed := ts.MakeFixed()
		predFixed.AddValue(ts.GetIdFor(stringArgs[0]))
		subAnd := graph.NewAndIterator()
		subAnd.AddSubIterator(graph.NewLinksToIterator(ts, predFixed, "p"))
		subAnd.AddSubIterator(graph.NewLinksToIterator(ts, fixed, "o"))
		hasa := graph.NewHasaIterator(ts, subAnd, "s")
		and := graph.NewAndIterator()
		and.AddSubIterator(hasa)
		and.AddSubIterator(subIt)
		it = and
	case "morphism":
		it = base
	case "and":
		arg, _ := obj.Get("_gremlin_values")
		firstArg, _ := arg.Object().Get("0")
		if !isVertexChain(firstArg.Object()) {
			return graph.NewNullIterator()
		}
		argIt := buildIteratorTree(firstArg.Object(), ts)

		and := graph.NewAndIterator()
		and.AddSubIterator(subIt)
		and.AddSubIterator(argIt)
		it = and
	case "back":
		arg, _ := obj.Get("_gremlin_back_chain")
		argIt := buildIteratorTree(arg.Object(), ts)
		and := graph.NewAndIterator()
		and.AddSubIterator(subIt)
		and.AddSubIterator(argIt)
		it = and
	case "is":
		fixed := ts.MakeFixed()
		for _, name := range stringArgs {
			fixed.AddValue(ts.GetIdFor(name))
		}
		and := graph.NewAndIterator()
		and.AddSubIterator(fixed)
		and.AddSubIterator(subIt)
		it = and
	case "or":
		arg, _ := obj.Get("_gremlin_values")
		firstArg, _ := arg.Object().Get("0")
		if !isVertexChain(firstArg.Object()) {
			return graph.NewNullIterator()
		}
		argIt := buildIteratorTree(firstArg.Object(), ts)

		or := graph.NewOrIterator()
		or.AddSubIterator(subIt)
		or.AddSubIterator(argIt)
		it = or
	case "both":
		// Hardly the most efficient pattern, but the most general.
		// Worth looking into an Optimize() optimization here.
		clone := subIt.Clone()
		it1 := buildInOutIterator(obj, ts, subIt, false)
		it2 := buildInOutIterator(obj, ts, clone, true)

		or := graph.NewOrIterator()
		or.AddSubIterator(it1)
		or.AddSubIterator(it2)
		it = or
	case "out":
		it = buildInOutIterator(obj, ts, subIt, false)
	case "follow":
		// Follow a morphism
		arg, _ := obj.Get("_gremlin_values")
		firstArg, _ := arg.Object().Get("0")
		if isVertexChain(firstArg.Object()) {
			return graph.NewNullIterator()
		}
		it = buildIteratorTreeHelper(firstArg.Object(), ts, subIt)
	case "followr":
		// Follow a morphism
		arg, _ := obj.Get("_gremlin_followr")
		if isVertexChain(arg.Object()) {
			return graph.NewNullIterator()
		}
		it = buildIteratorTreeHelper(arg.Object(), ts, subIt)
	case "in":
		it = buildInOutIterator(obj, ts, subIt, true)
	}
	return it
}