| /* |
| * 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.graphson; |
| |
| import org.apache.tinkerpop.gremlin.process.traversal.step.util.Tree; |
| import org.apache.tinkerpop.gremlin.structure.Element; |
| import org.apache.tinkerpop.shaded.jackson.annotation.JsonTypeInfo; |
| import org.apache.tinkerpop.shaded.jackson.core.type.TypeReference; |
| import org.apache.tinkerpop.shaded.jackson.databind.DatabindContext; |
| import org.apache.tinkerpop.shaded.jackson.databind.JavaType; |
| import org.apache.tinkerpop.shaded.jackson.databind.jsontype.TypeIdResolver; |
| import org.apache.tinkerpop.shaded.jackson.databind.type.TypeFactory; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Provides quick lookup for Type deserialization extracted from the JSON payload. As well as the Java Object to types |
| * compatible for the version 2.0 of GraphSON. |
| * |
| * @author Kevin Gallardo (https://kgdo.me) |
| */ |
| public class GraphSONTypeIdResolver implements TypeIdResolver { |
| |
| private final Map<String, JavaType> idToType = new HashMap<>(); |
| |
| private final Map<Class, String> typeToId = new HashMap<>(); |
| |
| // Override manually a type definition. |
| public GraphSONTypeIdResolver addCustomType(final String name, final Class clasz) { |
| if (Tree.class.isAssignableFrom(clasz)) { |
| // there is a special case for Tree which extends a Map, but has only 1 parametrized type, |
| // and for which creating a default type is failing because it may fall into a |
| // a self-referencing never-ending loop. Temporarily we force Tree<Element> |
| // which should cover all the usage TinkerPop would do of the Trees anyway. |
| idToType.put(name, TypeFactory.defaultInstance().constructType(new TypeReference<Tree<? extends Element>>() {})); |
| } else { |
| idToType.put(name, TypeFactory.defaultInstance().constructType(clasz)); |
| } |
| typeToId.put(clasz, name); |
| return this; |
| } |
| |
| public final Map<String, JavaType> getIdToType() { |
| return idToType; |
| } |
| |
| public final Map<Class, String> getTypeToId() { |
| return typeToId; |
| } |
| |
| @Override |
| public void init(final JavaType javaType) { |
| } |
| |
| @Override |
| public String idFromValue(final Object o) { |
| return idFromValueAndType(o, o.getClass()); |
| } |
| |
| @Override |
| public String idFromValueAndType(final Object o, final Class<?> aClass) { |
| if (!typeToId.containsKey(aClass)) { |
| // If one wants to serialize an object with a type, but hasn't registered |
| // a typeID for that class, fail. |
| throw new IllegalArgumentException(String.format("Could not find a type identifier for the class : %s. " + |
| "Make sure the value to serialize has a type identifier registered for its class.", aClass)); |
| } else { |
| return typeToId.get(aClass); |
| } |
| } |
| |
| @Override |
| public String idFromBaseType() { |
| return null; |
| } |
| |
| @Override |
| public JavaType typeFromId(final DatabindContext databindContext, final String s) { |
| // Get the type from the string from the stored Map. If not found, default to deserialize as a String. |
| return idToType.containsKey(s) ? idToType.get(s) : databindContext.constructType(String.class); |
| } |
| |
| @Override |
| public String getDescForKnownTypeIds() { |
| return "GraphSON advanced typing system"; |
| } |
| |
| @Override |
| public JsonTypeInfo.Id getMechanism() { |
| return JsonTypeInfo.Id.CUSTOM; |
| } |
| } |