001/* 002 * Copyright 2012-2018 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.json; 018 019import java.util.List; 020import java.util.Map; 021 022import com.fasterxml.jackson.core.type.TypeReference; 023import com.fasterxml.jackson.databind.ObjectMapper; 024 025/** 026 * Thin wrapper to adapt Jackson 2 {@link ObjectMapper} to {@link JsonParser}. 027 * 028 * @author Dave Syer 029 * @see JsonParserFactory 030 */ 031public class JacksonJsonParser extends AbstractJsonParser { 032 033 private static final TypeReference<?> MAP_TYPE = new MapTypeReference(); 034 035 private static final TypeReference<?> LIST_TYPE = new ListTypeReference(); 036 037 private ObjectMapper objectMapper; // Late binding 038 039 /** 040 * Creates an instance with the specified {@link ObjectMapper}. 041 * @param objectMapper the object mapper to use 042 */ 043 public JacksonJsonParser(ObjectMapper objectMapper) { 044 this.objectMapper = objectMapper; 045 } 046 047 /** 048 * Creates an instance with a default {@link ObjectMapper} that is created lazily. 049 */ 050 public JacksonJsonParser() { 051 } 052 053 @Override 054 public Map<String, Object> parseMap(String json) { 055 return tryParse(() -> getObjectMapper().readValue(json, MAP_TYPE), 056 Exception.class); 057 } 058 059 @Override 060 public List<Object> parseList(String json) { 061 return tryParse(() -> getObjectMapper().readValue(json, LIST_TYPE), 062 Exception.class); 063 } 064 065 private ObjectMapper getObjectMapper() { 066 if (this.objectMapper == null) { 067 this.objectMapper = new ObjectMapper(); 068 } 069 return this.objectMapper; 070 } 071 072 private static class MapTypeReference extends TypeReference<Map<String, Object>> { 073 074 } 075 076 private static class ListTypeReference extends TypeReference<List<Object>> { 077 078 } 079 080}