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A module that handles externalized configuration files.
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/*
 * Copyright (c) 2016 Network New Technologies Inc.
 *
 * Licensed 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 com.networknt.config;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;

import java.io.IOException;
import java.util.List;
import java.util.Map;

public class JsonMapper {
    public static ObjectMapper objectMapper = new ObjectMapper();

    static {
        objectMapper.configure(com.fasterxml.jackson.core.JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN, true);
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        objectMapper.registerModule(new JavaTimeModule());
        objectMapper.registerModule(new Jdk8Module());
    }

    public static String toJson(Object x) {
        try {
            return objectMapper.writeValueAsString(x);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }

    public static  T fromJson(String json, Class targetType) {
        try {
            return objectMapper.readValue(json, targetType);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static Map string2Map(String s) {
        try {
            return objectMapper.readValue(s, new TypeReference>(){});
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static List> string2List(String s) {
        try {
            return objectMapper.readValue(s, new TypeReference>>(){});
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}