From 5b8570fe7fc46682c4c8012d41e94b2d53714c51 Mon Sep 17 00:00:00 2001
From: Thespica <spica@apache.org>
Date: Wed, 2 Oct 2024 16:03:51 +0800
Subject: [PATCH] not delay link of soruce label and target label to avoid null
 links

---
 .../hugegraph/structure/schema/EdgeLabel.java | 24 ++++---------------
 1 file changed, 5 insertions(+), 19 deletions(-)

diff --git a/hugegraph-client/src/main/java/org/apache/hugegraph/structure/schema/EdgeLabel.java b/hugegraph-client/src/main/java/org/apache/hugegraph/structure/schema/EdgeLabel.java
index 9d07f47bc..d29b21583 100644
--- a/hugegraph-client/src/main/java/org/apache/hugegraph/structure/schema/EdgeLabel.java
+++ b/hugegraph-client/src/main/java/org/apache/hugegraph/structure/schema/EdgeLabel.java
@@ -61,6 +61,7 @@ public class EdgeLabel extends SchemaLabel {
     public EdgeLabel(@JsonProperty("name") String name) {
         super(name);
         this.frequency = Frequency.DEFAULT;
+        this.links = new HashSet<>();
         this.sortKeys = new CopyOnWriteArrayList<>();
         this.ttl = 0L;
         this.ttlStartTime = null;
@@ -112,7 +113,7 @@ public Set<Map<String, String>> links() {
     }
 
     public boolean linkedVertexLabel(String vertexLabel) {
-         if (this.edgeLabelType.parent() || this.links == null) {
+         if (this.edgeLabelType.parent() || this.links == null || this.links.isEmpty()) {
              return false;
          }
 
@@ -214,7 +215,6 @@ public EdgeLabel build() {
 
         @Override
         public EdgeLabel create() {
-            this.checkThenLinkSourceAndTarget();
             return this.manager.addEdgeLabel(this.edgeLabel);
         }
 
@@ -259,11 +259,6 @@ public Builder nullableKeys(String... keys) {
 
         @Override
         public Builder link(String sourceLabel, String targetLabel) {
-            if (this.edgeLabel.links == null) {
-                this.edgeLabel.links = new HashSet<>();
-                this.sourceLabel = sourceLabel;
-                this.targetLabel = targetLabel;
-            }
             HashMap<String, String> map = new HashMap<>();
             map.put(sourceLabel, targetLabel);
             this.edgeLabel.links.add(map);
@@ -292,8 +287,7 @@ public Builder asGeneral() {
 
         @Override
         public Builder sourceLabel(String label) {
-            E.checkArgument(this.edgeLabel.links == null ||
-                            this.edgeLabel.links.isEmpty(),
+            E.checkArgument(this.edgeLabel.links.isEmpty(),
                             "Not allowed add source label to an edge label which " +
                             "already has links");
             this.sourceLabel = label;
@@ -302,14 +296,14 @@ public Builder sourceLabel(String label) {
 
         @Override
         public Builder targetLabel(String label) {
-            E.checkArgument(this.edgeLabel.links == null ||
-                            this.edgeLabel.links.isEmpty(),
+            E.checkArgument(this.edgeLabel.links.isEmpty(),
                             "Not allowed add source label to an edge label which " +
                             "already has links");
             E.checkArgument(this.sourceLabel != null,
                             "Not allowed add target label to an edge label which " +
                             "not has source label yet");
             this.targetLabel = label;
+            link(this.sourceLabel, this.targetLabel);
             return this;
         }
 
@@ -372,14 +366,6 @@ private void checkFrequency() {
                             "Not allowed to change frequency for " +
                             "edge label '%s'", this.edgeLabel.name);
         }
-
-        private void checkThenLinkSourceAndTarget() {
-            E.checkArgument((this.sourceLabel != null && this.targetLabel != null) ||
-                            (this.sourceLabel == null && this.targetLabel == null),
-                            "Not allowed to add edge label with only one " +
-                            "source/target label");
-            this.link(this.sourceLabel, this.targetLabel);
-        }
     }
 
     public static class EdgeLabelV53 extends SchemaLabel {