| /* |
| * 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.tinkerpop.gremlin.structure.io.binary.types; |
| |
| import org.apache.tinkerpop.gremlin.structure.io.binary.GraphBinaryReader; |
| import org.apache.tinkerpop.gremlin.structure.io.binary.GraphBinaryWriter; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traversal; |
| import org.apache.tinkerpop.gremlin.process.traversal.TraversalStrategy; |
| import org.apache.tinkerpop.gremlin.process.traversal.util.TraversalExplanation; |
| import org.apache.tinkerpop.gremlin.structure.io.Buffer; |
| import org.javatuples.Pair; |
| |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.stream.Collectors; |
| |
| public class TraversalExplanationSerializer extends SimpleTypeSerializer<TraversalExplanation> implements TransformSerializer<TraversalExplanation> { |
| private static final String ORIGINAL = "original"; |
| private static final String FINAL = "final"; |
| private static final String INTERMEDIATE = "intermediate"; |
| private static final String CATEGORY = "category"; |
| private static final String TRAVERSAL = "traversal"; |
| private static final String STRATEGY = "strategy"; |
| |
| public TraversalExplanationSerializer() { |
| super(null); |
| } |
| |
| @Override |
| protected TraversalExplanation readValue(final Buffer buffer, final GraphBinaryReader context) throws IOException { |
| throw new IOException("A TraversalExplanation should not be read individually"); |
| } |
| |
| @Override |
| protected void writeValue(final TraversalExplanation value, final Buffer buffer, final GraphBinaryWriter context) throws IOException { |
| throw new IOException("A TraversalExplanation should not be written individually"); |
| } |
| |
| /** |
| * Creates a Map containing "original", "intermediate" and "final" keys. |
| */ |
| @Override |
| public Object transform(final TraversalExplanation value) { |
| final Map<String, Object> result = new HashMap<>(); |
| result.put(ORIGINAL, getTraversalSteps(value.getOriginalTraversal())); |
| |
| final List<Pair<TraversalStrategy, Traversal.Admin<?, ?>>> strategyTraversals = value.getStrategyTraversals(); |
| |
| result.put(INTERMEDIATE, |
| strategyTraversals.stream().map(pair -> { |
| final Map<String, Object> item = new HashMap<>(); |
| item.put(STRATEGY, pair.getValue0().toString()); |
| item.put(CATEGORY, pair.getValue0().getTraversalCategory().getSimpleName()); |
| item.put(TRAVERSAL, getTraversalSteps(pair.getValue1())); |
| return item; |
| }).collect(Collectors.toList())); |
| |
| result.put(FINAL, getTraversalSteps(strategyTraversals.isEmpty() |
| ? value.getOriginalTraversal() : strategyTraversals.get(strategyTraversals.size() - 1).getValue1())); |
| return result; |
| } |
| |
| private static List<String> getTraversalSteps(final Traversal.Admin<?, ?> t) { |
| return t.getSteps().stream().map(Object::toString).collect(Collectors.toList()); |
| } |
| } |