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jermy pushed a commit to branch unify-get-label-id
in repository https://gitbox.apache.org/repos/asf/incubator-hugegraph.git

commit 0e4a1230ad372144505b37f95e11d13a501a6bd2
Author: Jermy Li <[email protected]>
AuthorDate: Sat Feb 24 12:38:59 2024 +0800

    chore: unify to call SchemaLabel.getLabelId()
    
    Change-Id: I31bcc0d1ee99f3c443f8f4f0d458e06ca89977ef
---
 .../main/java/org/apache/hugegraph/api/traversers/Vertices.java   | 7 ++++++-
 .../org/apache/hugegraph/job/algorithm/AbstractAlgorithm.java     | 2 +-
 .../job/algorithm/cent/BetweennessCentralityAlgorithmV2.java      | 6 ++----
 .../job/algorithm/cent/ClosenessCentralityAlgorithmV2.java        | 5 +----
 .../hugegraph/job/algorithm/cent/DegreeCentralityAlgorithm.java   | 2 +-
 .../hugegraph/job/algorithm/cent/StressCentralityAlgorithmV2.java | 7 ++-----
 .../org/apache/hugegraph/job/algorithm/comm/LpaAlgorithm.java     | 2 +-
 .../src/main/java/org/apache/hugegraph/schema/SchemaLabel.java    | 8 ++++++++
 .../traversal/algorithm/FusiformSimilarityTraverser.java          | 2 +-
 .../org/apache/hugegraph/traversal/algorithm/HugeTraverser.java   | 8 ++++----
 .../hugegraph/traversal/algorithm/JaccardSimilarTraverser.java    | 2 +-
 .../apache/hugegraph/traversal/algorithm/KneighborTraverser.java  | 2 +-
 .../org/apache/hugegraph/traversal/algorithm/KoutTraverser.java   | 2 +-
 .../org/apache/hugegraph/traversal/algorithm/PathsTraverser.java  | 2 +-
 .../hugegraph/traversal/algorithm/PersonalRankTraverser.java      | 2 +-
 .../hugegraph/traversal/algorithm/SameNeighborTraverser.java      | 4 ++--
 .../hugegraph/traversal/algorithm/ShortestPathTraverser.java      | 4 ++--
 .../traversal/algorithm/SingleSourceShortestPathTraverser.java    | 4 ++--
 .../apache/hugegraph/traversal/algorithm/SubGraphTraverser.java   | 2 +-
 19 files changed, 39 insertions(+), 34 deletions(-)

diff --git 
a/hugegraph-server/hugegraph-api/src/main/java/org/apache/hugegraph/api/traversers/Vertices.java
 
b/hugegraph-server/hugegraph-api/src/main/java/org/apache/hugegraph/api/traversers/Vertices.java
index bf231ca90..d5be69489 100644
--- 
a/hugegraph-server/hugegraph-api/src/main/java/org/apache/hugegraph/api/traversers/Vertices.java
+++ 
b/hugegraph-server/hugegraph-api/src/main/java/org/apache/hugegraph/api/traversers/Vertices.java
@@ -26,6 +26,7 @@ import java.util.Set;
 import org.apache.hugegraph.HugeGraph;
 import org.apache.hugegraph.backend.id.Id;
 import org.apache.hugegraph.backend.query.ConditionQuery;
+import org.apache.hugegraph.schema.SchemaLabel;
 import org.apache.hugegraph.structure.HugeVertex;
 import org.apache.hugegraph.traversal.optimize.TraversalUtil;
 import org.apache.hugegraph.type.HugeType;
@@ -51,6 +52,10 @@ public class Vertices {
                           this.label == null), "No source vertices provided");
         Iterator<Vertex> iterator;
         if (this.ids != null && !this.ids.isEmpty()) {
+            E.checkArgument(this.label == null,
+                            "Just provide one of ids or label of source 
vertices");
+            E.checkArgument(props == null || props.isEmpty(),
+                            "Just provide one of ids or properties of source 
vertices");
             List<Id> sourceIds = new ArrayList<>(this.ids.size());
             for (Object id : this.ids) {
                 sourceIds.add(HugeVertex.getIdValue(id));
@@ -62,7 +67,7 @@ public class Vertices {
         } else {
             ConditionQuery query = new ConditionQuery(HugeType.VERTEX);
             if (this.label != null) {
-                Id label = g.vertexLabel(this.label).id();
+                Id label = SchemaLabel.getVertexLabelId(g, this.label);
                 query.eq(HugeKeys.LABEL, label);
             }
             if (props != null && !props.isEmpty()) {
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/AbstractAlgorithm.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/AbstractAlgorithm.java
index 0e249ebe2..b30d3ac83 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/AbstractAlgorithm.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/AbstractAlgorithm.java
@@ -379,7 +379,7 @@ public abstract class AbstractAlgorithm implements 
Algorithm {
             ConditionQuery query = new ConditionQuery(HugeType.VERTEX);
             query.capacity(Query.NO_CAPACITY);
             query.limit(limit);
-            query.eq(HugeKeys.LABEL, this.getVertexLabelId(label));
+            query.eq(HugeKeys.LABEL, this.getVertexLabelIdOrNull(label));
             return this.graph().vertices(query);
         }
 
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/BetweennessCentralityAlgorithmV2.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/BetweennessCentralityAlgorithmV2.java
index d33dc54eb..bc4c3ae37 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/BetweennessCentralityAlgorithmV2.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/BetweennessCentralityAlgorithmV2.java
@@ -26,6 +26,7 @@ import org.apache.hugegraph.backend.id.Id;
 import org.apache.hugegraph.backend.query.Query;
 import org.apache.hugegraph.job.UserJob;
 import org.apache.hugegraph.job.algorithm.BfsTraverser;
+import org.apache.hugegraph.schema.SchemaLabel;
 import org.apache.hugegraph.structure.HugeVertex;
 import org.apache.hugegraph.traversal.algorithm.HugeTraverser;
 import org.apache.hugegraph.type.define.Directions;
@@ -80,10 +81,7 @@ public class BetweennessCentralityAlgorithmV2 extends 
AbstractCentAlgorithm {
             assert topN >= 0L || topN == NO_LIMIT;
 
             this.globalBetweennesses = new HashMap<>();
-            Id edgeLabelId = null;
-            if (label != null) {
-                edgeLabelId = this.graph().edgeLabel(label).id();
-            }
+            Id edgeLabelId = this.getEdgeLabelIdOrNull(label);
 
             // TODO: sample the startVertices
             Iterator<Vertex> startVertices = this.vertices(sourceLabel,
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/ClosenessCentralityAlgorithmV2.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/ClosenessCentralityAlgorithmV2.java
index e95eae587..1519a2a45 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/ClosenessCentralityAlgorithmV2.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/ClosenessCentralityAlgorithmV2.java
@@ -81,10 +81,7 @@ public class ClosenessCentralityAlgorithmV2 extends 
AbstractCentAlgorithm {
             assert degree > 0L || degree == NO_LIMIT;
             assert topN >= 0L || topN == NO_LIMIT;
 
-            Id edgeLabelId = null;
-            if (label != null) {
-                edgeLabelId = this.graph().edgeLabel(label).id();
-            }
+            Id edgeLabelId = this.getEdgeLabelIdOrNull(label);
 
             // TODO: sample the startVertices
             Iterator<Vertex> startVertices = this.vertices(sourceLabel,
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/DegreeCentralityAlgorithm.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/DegreeCentralityAlgorithm.java
index 5a995d6dd..19e68c053 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/DegreeCentralityAlgorithm.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/DegreeCentralityAlgorithm.java
@@ -73,7 +73,7 @@ public class DegreeCentralityAlgorithm extends 
AbstractCentAlgorithm {
             JsonMap degrees = new JsonMap();
             TopMap<Id> tops = new TopMap<>(topN);
             Id vertex = null;
-            Id labelId = this.getEdgeLabelId(label);
+            Id labelId = this.getEdgeLabelIdOrNull(label);
             long degree = 0L;
             long totalEdges = 0L;
 
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/StressCentralityAlgorithmV2.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/StressCentralityAlgorithmV2.java
index 5817e0386..d1c3da6d8 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/StressCentralityAlgorithmV2.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/cent/StressCentralityAlgorithmV2.java
@@ -60,7 +60,7 @@ public class StressCentralityAlgorithmV2 extends 
AbstractCentAlgorithm {
 
     private static class Traverser extends BfsTraverser<StressNode> {
 
-        private Map<Id, MutableLong> globalStresses;
+        private final Map<Id, MutableLong> globalStresses;
 
         private Traverser(UserJob<Object> job) {
             super(job);
@@ -80,10 +80,7 @@ public class StressCentralityAlgorithmV2 extends 
AbstractCentAlgorithm {
             assert degree > 0L || degree == NO_LIMIT;
             assert topN >= 0L || topN == NO_LIMIT;
 
-            Id edgeLabelId = null;
-            if (label != null) {
-                edgeLabelId = this.graph().edgeLabel(label).id();
-            }
+            Id edgeLabelId = this.getEdgeLabelIdOrNull(label);
 
             // TODO: sample the startVertices
             Iterator<Vertex> startVertices = this.vertices(sourceLabel,
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/comm/LpaAlgorithm.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/comm/LpaAlgorithm.java
index 289ebca04..4b2e30db3 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/comm/LpaAlgorithm.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/comm/LpaAlgorithm.java
@@ -178,7 +178,7 @@ public class LpaAlgorithm extends AbstractCommAlgorithm {
                                              Directions dir, long degree) {
             // neighbors of source vertex v
             Id source = (Id) vertex.id();
-            Id labelId = this.getEdgeLabelId(edgeLabel);
+            Id labelId = this.getEdgeLabelIdOrNull(edgeLabel);
             Iterator<Id> neighbors = this.adjacentVertices(source, dir,
                                                            labelId, degree);
 
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/schema/SchemaLabel.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/schema/SchemaLabel.java
index e20a3f89d..09de43e2d 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/schema/SchemaLabel.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/schema/SchemaLabel.java
@@ -177,4 +177,12 @@ public abstract class SchemaLabel extends SchemaElement
                     label.getClass());
         }
     }
+
+    public static Id getVertexLabelId(HugeGraph graph, Object label) {
+        return SchemaLabel.getLabelId(graph, HugeType.VERTEX, label);
+    }
+
+    public static Id getEdgeLabelId(HugeGraph graph, Object label) {
+        return SchemaLabel.getLabelId(graph, HugeType.EDGE, label);
+    }
 }
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/FusiformSimilarityTraverser.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/FusiformSimilarityTraverser.java
index 55ee91b56..741a6ef6f 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/FusiformSimilarityTraverser.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/FusiformSimilarityTraverser.java
@@ -112,7 +112,7 @@ public class FusiformSimilarityTraverser extends 
HugeTraverser {
             // Ignore current vertex if its neighbors number is not enough
             return ImmutableSet.of();
         }
-        Id labelId = this.getEdgeLabelId(label);
+        Id labelId = this.getEdgeLabelIdOrNull(label);
         // Get similar nodes and counts
         Iterator<Edge> edges = this.edgesOfVertex(vertex.id(), direction,
                                                   labelId, degree);
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/HugeTraverser.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/HugeTraverser.java
index e75d01635..57c7c0a31 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/HugeTraverser.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/HugeTraverser.java
@@ -620,18 +620,18 @@ public class HugeTraverser {
         }
     }
 
-    protected Object getVertexLabelId(Object label) {
+    protected Object getVertexLabelIdOrNull(Object label) {
         if (label == null) {
             return null;
         }
-        return SchemaLabel.getLabelId(this.graph, HugeType.VERTEX, label);
+        return SchemaLabel.getVertexLabelId(this.graph, label);
     }
 
-    protected Id getEdgeLabelId(Object label) {
+    protected Id getEdgeLabelIdOrNull(Object label) {
         if (label == null) {
             return null;
         }
-        return SchemaLabel.getLabelId(this.graph, HugeType.EDGE, label);
+        return SchemaLabel.getEdgeLabelId(this.graph, label);
     }
 
     protected void checkVertexExist(Id vertexId, String name) {
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/JaccardSimilarTraverser.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/JaccardSimilarTraverser.java
index 51c81b9e1..296e89ad4 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/JaccardSimilarTraverser.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/JaccardSimilarTraverser.java
@@ -54,7 +54,7 @@ public class JaccardSimilarTraverser extends OltpTraverser {
         E.checkNotNull(dir, "direction");
         checkDegree(degree);
 
-        Id labelId = this.getEdgeLabelId(label);
+        Id labelId = this.getEdgeLabelIdOrNull(label);
 
         Set<Id> sourceNeighbors = IteratorUtils.set(this.adjacentVertices(
                 vertex, dir, labelId, degree));
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/KneighborTraverser.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/KneighborTraverser.java
index cc2a3990a..2b284b26a 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/KneighborTraverser.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/KneighborTraverser.java
@@ -46,7 +46,7 @@ public class KneighborTraverser extends OltpTraverser {
         checkDegree(degree);
         checkLimit(limit);
 
-        Id labelId = this.getEdgeLabelId(label);
+        Id labelId = this.getEdgeLabelIdOrNull(label);
 
         KneighborRecords records = new KneighborRecords(true, sourceV, true);
 
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/KoutTraverser.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/KoutTraverser.java
index 61ec0a4b6..8cf3c15b7 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/KoutTraverser.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/KoutTraverser.java
@@ -58,7 +58,7 @@ public class KoutTraverser extends OltpTraverser {
                             capacity, limit);
         }
 
-        Id labelId = this.getEdgeLabelId(label);
+        Id labelId = this.getEdgeLabelIdOrNull(label);
 
         Set<Id> sources = newIdSet();
         Set<Id> neighbors = newIdSet();
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/PathsTraverser.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/PathsTraverser.java
index 76c2fa6a9..5746533a5 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/PathsTraverser.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/PathsTraverser.java
@@ -59,7 +59,7 @@ public class PathsTraverser extends HugeTraverser {
             return PathSet.EMPTY;
         }
 
-        Id labelId = this.getEdgeLabelId(label);
+        Id labelId = this.getEdgeLabelIdOrNull(label);
         Traverser traverser = new Traverser(sourceV, targetV, labelId,
                                             degree, capacity, limit);
         // We should stop early if walk backtrace or reach limit
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/PersonalRankTraverser.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/PersonalRankTraverser.java
index 972eff7c7..2c3bafa23 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/PersonalRankTraverser.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/PersonalRankTraverser.java
@@ -55,7 +55,7 @@ public class PersonalRankTraverser extends HugeTraverser {
         Map<Id, Double> ranks = newMap();
         ranks.put(source, 1.0);
 
-        Id labelId = this.graph().edgeLabel(label).id();
+        Id labelId = this.getEdgeLabelIdOrNull(label);
         Directions dir = this.getStartDirection(source, label);
 
         Set<Id> outSeeds = newIdSet();
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/SameNeighborTraverser.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/SameNeighborTraverser.java
index 036ec551c..af1623101 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/SameNeighborTraverser.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/SameNeighborTraverser.java
@@ -45,7 +45,7 @@ public class SameNeighborTraverser extends HugeTraverser {
         checkDegree(degree);
         checkLimit(limit);
 
-        Id labelId = this.getEdgeLabelId(label);
+        Id labelId = this.getEdgeLabelIdOrNull(label);
 
         Set<Id> sourceNeighbors = IteratorUtils.set(this.adjacentVertices(
                 vertex, direction, labelId, degree));
@@ -80,7 +80,7 @@ public class SameNeighborTraverser extends HugeTraverser {
         List<Id> labelsId = new ArrayList<>();
         if (labels != null) {
             for (String label : labels) {
-                labelsId.add(this.getEdgeLabelId(label));
+                labelsId.add(this.getEdgeLabelIdOrNull(label));
             }
         }
 
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/ShortestPathTraverser.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/ShortestPathTraverser.java
index a34f87289..4a2f3259d 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/ShortestPathTraverser.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/ShortestPathTraverser.java
@@ -61,7 +61,7 @@ public class ShortestPathTraverser extends HugeTraverser {
 
         Map<Id, String> labelMap = newMap(labels.size());
         for (String label : labels) {
-            labelMap.put(this.getEdgeLabelId(label), label);
+            labelMap.put(this.getEdgeLabelIdOrNull(label), label);
         }
         Traverser traverser = new Traverser(sourceV, targetV, dir, labelMap,
                                             degree, skipDegree, capacity);
@@ -122,7 +122,7 @@ public class ShortestPathTraverser extends HugeTraverser {
 
         Map<Id, String> labelMap = newMap(labels.size());
         for (String label : labels) {
-            labelMap.put(this.getEdgeLabelId(label), label);
+            labelMap.put(this.getEdgeLabelIdOrNull(label), label);
         }
         Traverser traverser = new Traverser(sourceV, targetV, dir, labelMap,
                                             degree, skipDegree, capacity);
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/SingleSourceShortestPathTraverser.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/SingleSourceShortestPathTraverser.java
index ead4365a9..0c67228ab 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/SingleSourceShortestPathTraverser.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/SingleSourceShortestPathTraverser.java
@@ -58,7 +58,7 @@ public class SingleSourceShortestPathTraverser extends 
HugeTraverser {
         checkSkipDegree(skipDegree, degree, capacity);
         checkLimit(limit);
 
-        Id labelId = this.getEdgeLabelId(label);
+        Id labelId = this.getEdgeLabelIdOrNull(label);
         Traverser traverser = new Traverser(sourceV, dir, labelId, weight,
                                             degree, skipDegree, capacity, 
limit);
         while (true) {
@@ -94,7 +94,7 @@ public class SingleSourceShortestPathTraverser extends 
HugeTraverser {
         checkCapacity(capacity);
         checkSkipDegree(skipDegree, degree, capacity);
 
-        Id labelId = this.getEdgeLabelId(label);
+        Id labelId = this.getEdgeLabelIdOrNull(label);
         Traverser traverser = new Traverser(sourceV, dir, labelId, weight,
                                             degree, skipDegree, capacity,
                                             NO_LIMIT);
diff --git 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/SubGraphTraverser.java
 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/SubGraphTraverser.java
index d5c49eacd..f76f3e377 100644
--- 
a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/SubGraphTraverser.java
+++ 
b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/algorithm/SubGraphTraverser.java
@@ -81,7 +81,7 @@ public class SubGraphTraverser extends HugeTraverser {
         checkCapacity(capacity);
         checkLimit(limit);
 
-        Id labelId = this.getEdgeLabelId(label);
+        Id labelId = this.getEdgeLabelIdOrNull(label);
         Traverser traverser = new Traverser(sourceV, labelId, depth, degree,
                                             capacity, limit, rings,
                                             sourceInRing);

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