feat: support edgeexistence api

hugegraph-client/assembly/travis/install-hugegraph-from-source.sh

@@ -28,6 +28,7 @@ GIT_DIR=hugegraph
 # download code and compile
 git clone --depth 100 ${HUGEGRAPH_GIT_URL} $GIT_DIR
 cd "${GIT_DIR}"
+git log
 git checkout "${COMMIT_ID}"
 mvn package -DskipTests -Dmaven.javadoc.skip=true -ntp
 

hugegraph-client/src/main/java/org/apache/hugegraph/api/traverser/EdgeExistenceAPI.java

@@ -0,0 +1,57 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with this
+ * work for additional information regarding copyright ownership. The ASF
+ * licenses this file to You under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.hugegraph.api.traverser;
+
+
+import org.apache.hugegraph.api.graph.GraphAPI;
+import org.apache.hugegraph.client.RestClient;
+import org.apache.hugegraph.rest.RestResult;
+import org.apache.hugegraph.structure.graph.Edge;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+public class EdgeExistenceAPI extends TraversersAPI {
+
+    public EdgeExistenceAPI(RestClient client, String graph) {
+        super(client, graph);
+    }
+
+    @Override
+    protected String type() {
+        return "edgeexistence";
+    }
+
+    public List<Edge> get(Object sourceId, Object targetId, String edgeLabel,
+                          String sortValues, long limit) {
+        String source = GraphAPI.formatVertexId(sourceId, false);
+        String target = GraphAPI.formatVertexId(targetId, false);
+
+        checkLimit((int) limit);
+
+        Map<String, Object> params = new LinkedHashMap<>();
+        params.put("source", source);
+        params.put("target", target);
+        params.put("label", edgeLabel);
+        params.put("sortValues", sortValues);
+        params.put("limit", limit);
+        RestResult result = this.client.get(this.path(), params);
+        return result.readList(this.type(), Edge.class);
+    }
+}

hugegraph-client/src/main/java/org/apache/hugegraph/driver/TraverserManager.java

@@ -45,6 +45,7 @@
 import org.apache.hugegraph.api.traverser.TemplatePathsAPI;
 import org.apache.hugegraph.api.traverser.VerticesAPI;
 import org.apache.hugegraph.api.traverser.WeightedShortestPathAPI;
+import org.apache.hugegraph.api.traverser.EdgeExistenceAPI;
 import org.apache.hugegraph.client.RestClient;
 import org.apache.hugegraph.structure.graph.Edge;
 import org.apache.hugegraph.structure.graph.Edges;
@@ -98,6 +99,7 @@ public class TraverserManager {
     private PersonalRankAPI personalRankAPI;
     private VerticesAPI verticesAPI;
     private EdgesAPI edgesAPI;
+    private EdgeExistenceAPI edgeExistenceAPI;
 
     public TraverserManager(RestClient client, GraphManager graphManager) {
         this.graphManager = graphManager;
@@ -124,6 +126,7 @@ public TraverserManager(RestClient client, GraphManager graphManager) {
         this.personalRankAPI = new PersonalRankAPI(client, graph);
         this.verticesAPI = new VerticesAPI(client, graph);
         this.edgesAPI = new EdgesAPI(client, graph);
+        this.edgeExistenceAPI = new EdgeExistenceAPI(client, graph);
     }
 
     public double jaccardSimilarity(Object vertexId, Object otherId) {
@@ -538,4 +541,10 @@ public Iterator<Edge> iteratorEdges(Shard shard, int sizePerPage) {
             return this.edges(shard, page, sizePerPage);
         });
     }
+
+    public List<Edge> edgeExistence(Object sourceId, Object targetId, String edgeLabel,
+                                    String sortValues, long limit){
+        return this.edgeExistenceAPI.get(sourceId, targetId, edgeLabel,
+                sortValues, limit);
+    }
 }

hugegraph-client/src/test/java/org/apache/hugegraph/api/ApiTestSuite.java

@@ -44,6 +44,7 @@
 import org.apache.hugegraph.api.traverser.SingleSourceShortestPathApiTest;
 import org.apache.hugegraph.api.traverser.TemplatePathsApiTest;
 import org.apache.hugegraph.api.traverser.WeightedShortestPathApiTest;
+import org.apache.hugegraph.api.traverser.EdgeExistenceAPITest;
 import org.junit.runner.RunWith;
 import org.junit.runners.Suite;
 
@@ -84,6 +85,7 @@
         FusiformSimilarityApiTest.class,
         NeighborRankApiTest.class,
         PersonalRankApiTest.class,
+        EdgeExistenceAPITest.class,
 
         TargetApiTest.class,
         GroupApiTest.class,

hugegraph-client/src/test/java/org/apache/hugegraph/api/BaseApiTest.java

@@ -31,6 +31,7 @@
 import org.apache.hugegraph.api.schema.SchemaAPI;
 import org.apache.hugegraph.api.schema.VertexLabelAPI;
 import org.apache.hugegraph.api.task.TaskAPI;
+import org.apache.hugegraph.api.traverser.EdgeExistenceAPI;
 import org.apache.hugegraph.api.variables.VariablesAPI;
 import org.apache.hugegraph.api.version.VersionAPI;
 import org.apache.hugegraph.client.RestClient;

hugegraph-client/src/test/java/org/apache/hugegraph/api/traverser/EdgeExistenceAPITest.java

@@ -0,0 +1,68 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with this
+ * work for additional information regarding copyright ownership. The ASF
+ * licenses this file to You under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.hugegraph.api.traverser;
+
+
+import org.apache.hugegraph.api.BaseApiTest;
+import org.apache.hugegraph.structure.graph.Edge;
+import org.apache.hugegraph.testutil.Assert;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import java.util.List;
+
+public class EdgeExistenceAPITest extends TraverserApiTest{
+
+    @BeforeClass
+    public static void prepareSchemaAndGraph() {
+        BaseApiTest.initPropertyKey();
+        BaseApiTest.initVertexLabel();
+        BaseApiTest.initEdgeLabel();
+        BaseApiTest.initIndexLabel();
+        BaseApiTest.initVertex();
+        BaseApiTest.initEdge();
+    }
+
+    @Test
+    public void testEdgeExistenceGet() {
+        Object markoId = getVertexId("person", "name", "marko");
+        Object vadasId = getVertexId("person", "name", "vadas");
+
+        List<Edge> edges = edgeExistenceAPI.get(markoId, vadasId,
+                                      "knows", "", 100);
+
+        Assert.assertEquals(1, edges.size());
+        String id = edges.get(0).id();
+
+        Assert.assertTrue(id.contains("marko"));
+        Assert.assertTrue(id.contains("vadas"));
+
+        Object lopId = getVertexId("software", "name", "lop");
+
+        edges = edgeExistenceAPI.get(lopId, vadasId,
+                           "knows", "", 100);
+        Assert.assertEquals(0, edges.size());
+
+        Object joshId = getVertexId("person", "name", "josh");
+        Object rippleId = getVertexId("person", "name", "ripple");
+
+        edges = edgeExistenceAPI.get(joshId, rippleId,
+                                    "created", "", 100);
+        Assert.assertEquals(1, edges.size());
+    }
+}

hugegraph-client/src/test/java/org/apache/hugegraph/api/traverser/TraverserApiTest.java

@@ -49,6 +49,7 @@ public class TraverserApiTest extends BaseApiTest {
 
     protected static VerticesAPI verticesAPI;
     protected static EdgesAPI edgesAPI;
+    protected static EdgeExistenceAPI edgeExistenceAPI;
 
     @BeforeClass
     public static void init() {
@@ -82,5 +83,7 @@ public static void init() {
 
         verticesAPI = new VerticesAPI(client, GRAPH);
         edgesAPI = new EdgesAPI(client, GRAPH);
+
+        edgeExistenceAPI = new EdgeExistenceAPI(client, GRAPH);
     }
 }