imbajin commented on code in PR #2864: URL: https://github.com/apache/incubator-hugegraph/pull/2864#discussion_r2313296382
########## hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/query/AdjacentEdgesQuery.java: ########## @@ -0,0 +1,396 @@ +/* + * 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.backend.query; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collection; +import java.util.List; + +import org.apache.hugegraph.backend.id.Id; +import org.apache.hugegraph.backend.query.Condition.Relation; +import org.apache.hugegraph.backend.query.Condition.RelationType; +import org.apache.hugegraph.structure.HugeEdge; +import org.apache.hugegraph.structure.HugeElement; +import org.apache.hugegraph.type.HugeType; +import org.apache.hugegraph.type.define.Directions; +import org.apache.hugegraph.type.define.HugeKeys; +import org.apache.hugegraph.util.CollectionUtil; +import org.apache.hugegraph.util.E; +import org.apache.hugegraph.util.InsertionOrderUtil; + +import com.google.common.collect.ImmutableList; + +public class AdjacentEdgesQuery extends ConditionQuery { + + private Id ownerVertex; + private Directions direction; + private Id[] edgeLabels; + + private List<Condition> selfConditions; + + private static final Id[] EMPTY = new Id[0]; + + public AdjacentEdgesQuery(Id ownerVertex, Directions direction) { + this(ownerVertex, direction, EMPTY); + } + + public AdjacentEdgesQuery(Id ownerVertex, Directions direction, + Id[] edgeLabels) { + super(HugeType.EDGE); + E.checkArgument(ownerVertex != null, + "The edge query must contain source vertex"); + E.checkArgument(direction != null, + "The edge query must contain direction"); + this.ownerVertex = ownerVertex; + this.direction = direction; + this.edgeLabels = edgeLabels; + this.selfConditions = null; + } + + @Override + public int conditionsSize() { + int size = super.conditionsSize() + 2; + if (this.edgeLabels.length > 0) { + size += 1; + } + return size; + } + + @Override + public ConditionQuery query(Condition condition) { + if (!condition.isRelation()) { + return super.query(condition); + } + + // Reset this.selfConditions cache + this.selfConditions = null; + + // Update condition fields + Relation relation = ((Condition.Relation) condition); + Object key = relation.key(); + RelationType relationType = relation.relation(); + + if (key == HugeKeys.OWNER_VERTEX) { + this.ownerVertex = (Id) relation.value(); + return this; + } + if (key == HugeKeys.DIRECTION) { + this.direction = (Directions) relation.value(); + return this; + } + if (key == HugeKeys.LABEL) { + Collection<Id> labels = null; + if (relationType == RelationType.EQ) { + labels = ImmutableList.of((Id) relation.value()); + } else if (relationType == RelationType.IN) { + @SuppressWarnings("unchecked") + Collection<Id> value = (Collection<Id>) relation.value(); + labels = value; + } else { + E.checkArgument(false, + "Unexpected relation type '%s' for '%s'", + relationType, key); + } + + if (this.edgeLabels.length == 0) { + this.edgeLabels = labels.toArray(new Id[0]); + } else { + Collection<Id> edgeLabels = CollectionUtil.intersect( + Arrays.asList(this.edgeLabels), + labels); + if (edgeLabels.isEmpty()) { + // Returns empty result if conditions are conflicting + this.limit(0L); + } + this.edgeLabels = edgeLabels.toArray(new Id[0]); + } + return this; + } + + return super.query(condition); + } + + @Override + public Collection<Condition> conditions() { + List<Condition> conds = this.selfConditions(); + if (super.conditionsSize() > 0) { + conds.addAll(super.conditions()); + } + return conds; + } + + private List<Condition> selfConditions() { + if (this.selfConditions != null) { + /* + * Return selfConditions cache if it has been collected before + * NOTE: it's also to keep the serialized condition value + */ + return this.selfConditions; + } + + List<Condition> conds = InsertionOrderUtil.newList(); + + conds.add(Condition.eq(HugeKeys.OWNER_VERTEX, this.ownerVertex)); + + if (this.direction == Directions.BOTH) { + conds.add(Condition.in(HugeKeys.DIRECTION, ImmutableList.of( + Directions.OUT, + Directions.IN))); + } else { + conds.add(Condition.eq(HugeKeys.DIRECTION, this.direction)); + } + + if (this.edgeLabels.length == 1) { + conds.add(Condition.eq(HugeKeys.LABEL, this.edgeLabels[0])); + } else if (this.edgeLabels.length > 1) { + conds.add(Condition.in(HugeKeys.LABEL, + Arrays.asList(this.edgeLabels))); + } + + this.selfConditions = conds; + return conds; + } + + @Override + public <T> T condition(Object key) { + T cond = this.selfCondition(key); + if (cond != null) { + return cond; + } + return super.condition(key); + } + + @SuppressWarnings("unchecked") + private <T> T selfCondition(Object key) { + if (key == HugeKeys.OWNER_VERTEX) { + return (T) this.ownerVertex; + } + if (key == HugeKeys.DIRECTION) { + return (T) this.direction; + } Review Comment: The logic in selfCondition() at line 186 should return an array for consistency when edgeLabels.length > 1, or throw the exception immediately instead of having an unreachable return statement. -- This is an automated message from the Apache Git Service. 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