001/* 002 * Copyright 2012-2017 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.boot.jackson; 018 019import java.io.IOException; 020 021import com.fasterxml.jackson.core.JsonGenerator; 022import com.fasterxml.jackson.databind.JsonMappingException; 023import com.fasterxml.jackson.databind.JsonSerializer; 024import com.fasterxml.jackson.databind.SerializerProvider; 025 026/** 027 * Helper base class for {@link JsonSerializer} implementations that serialize objects. 028 * 029 * @param <T> the supported object type 030 * @author Phillip Webb 031 * @since 1.4.0 032 * @see JsonObjectDeserializer 033 */ 034public abstract class JsonObjectSerializer<T> extends JsonSerializer<T> { 035 036 @Override 037 public final void serialize(T value, JsonGenerator jgen, SerializerProvider provider) 038 throws IOException { 039 try { 040 jgen.writeStartObject(); 041 serializeObject(value, jgen, provider); 042 jgen.writeEndObject(); 043 } 044 catch (Exception ex) { 045 if (ex instanceof IOException) { 046 throw (IOException) ex; 047 } 048 throw new JsonMappingException(jgen, "Object serialize error", ex); 049 } 050 } 051 052 /** 053 * Serialize JSON content into the value type this serializer handles. 054 * @param value the source value 055 * @param jgen the JSON generator 056 * @param provider the serializer provider 057 * @throws IOException on error 058 */ 059 protected abstract void serializeObject(T value, JsonGenerator jgen, 060 SerializerProvider provider) throws IOException; 061 062}