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 org.springframework.util.ClassUtils;
020
021/**
022 * Factory to create a {@link JsonParser}.
023 *
024 * @author Dave Syer
025 * @see JacksonJsonParser
026 * @see GsonJsonParser
027 * @see YamlJsonParser
028 * @see BasicJsonParser
029 */
030public abstract class JsonParserFactory {
031
032        /**
033         * Static factory for the "best" JSON parser available on the classpath. Tries
034         * Jackson, then Gson, Snake YAML, and then falls back to the {@link BasicJsonParser}.
035         * @return a {@link JsonParser}
036         */
037        public static JsonParser getJsonParser() {
038                if (ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", null)) {
039                        return new JacksonJsonParser();
040                }
041                if (ClassUtils.isPresent("com.google.gson.Gson", null)) {
042                        return new GsonJsonParser();
043                }
044                if (ClassUtils.isPresent("org.yaml.snakeyaml.Yaml", null)) {
045                        return new YamlJsonParser();
046                }
047                return new BasicJsonParser();
048        }
049
050}