| /* |
| * 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.shaded.jackson.core.JsonGenerator; |
| import org.apache.tinkerpop.shaded.jackson.databind.JsonSerializer; |
| import org.apache.tinkerpop.shaded.jackson.databind.SerializerProvider; |
| import org.apache.tinkerpop.shaded.jackson.databind.jsontype.TypeSerializer; |
| |
| import java.io.IOException; |
| |
| /** |
| * Utility methods for GraphSON serialization. Functions in here might be used by external serializers. |
| * |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| */ |
| public final class GraphSONUtil { |
| |
| private GraphSONUtil() { |
| } |
| |
| public static void writeWithType(final Object object, final JsonGenerator jsonGenerator, |
| final SerializerProvider serializerProvider, |
| final TypeSerializer typeSerializer) throws IOException { |
| writeWithType(null, object, jsonGenerator, serializerProvider, typeSerializer); |
| } |
| |
| public static void writeWithType(final String key, final Object object, final JsonGenerator jsonGenerator, |
| final SerializerProvider serializerProvider, |
| final TypeSerializer typeSerializer) throws IOException { |
| final JsonSerializer<Object> serializer = serializerProvider.findValueSerializer(object.getClass(), null); |
| if (typeSerializer != null) { |
| // serialize with types embedded |
| if (key != null && !key.isEmpty()) jsonGenerator.writeFieldName(key); |
| serializer.serializeWithType(object, jsonGenerator, serializerProvider, typeSerializer); |
| } else { |
| // types are not embedded, but use the serializer when possible or else custom serializers will get |
| // bypassed and you end up with the default jackson serializer when you don't want it. |
| if (key != null && !key.isEmpty()) jsonGenerator.writeFieldName(key); |
| serializer.serialize(object, jsonGenerator, serializerProvider); |
| } |
| } |
| |
| public static void writeStartObject(final Object o, final JsonGenerator jsonGenerator, final TypeSerializer typeSerializer) throws IOException { |
| if (typeSerializer != null) |
| typeSerializer.writeTypePrefixForObject(o, jsonGenerator); |
| else |
| jsonGenerator.writeStartObject(); |
| } |
| |
| public static void writeEndObject(final Object o, final JsonGenerator jsonGenerator, final TypeSerializer typeSerializer) throws IOException { |
| if (typeSerializer != null) |
| typeSerializer.writeTypeSuffixForObject(o, jsonGenerator); |
| else |
| jsonGenerator.writeEndObject(); |
| } |
| |
| public static void writeStartArray(final Object o, final JsonGenerator jsonGenerator, final TypeSerializer typeSerializer) throws IOException { |
| if (typeSerializer != null) |
| typeSerializer.writeTypePrefixForArray(o, jsonGenerator); |
| else |
| jsonGenerator.writeStartArray(); |
| } |
| |
| |
| public static void writeEndArray(final Object o, final JsonGenerator jsonGenerator, final TypeSerializer typeSerializer) throws IOException { |
| if (typeSerializer != null) |
| typeSerializer.writeTypeSuffixForArray(o, jsonGenerator); |
| else |
| jsonGenerator.writeEndArray(); |
| } |
| |
| static void safeWriteObjectField(final JsonGenerator jsonGenerator, final String key, final Object value) { |
| try { |
| jsonGenerator.writeObjectField(key, value); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |