org.rapidoid.json.JSON.java Source code

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Here is the source code for org.rapidoid.json.JSON.java

Source

package org.rapidoid.json;

import java.io.OutputStream;
import java.util.Map;

import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.beany.Beany;
import org.rapidoid.log.Log;
import org.rapidoid.util.Cls;
import org.rapidoid.util.U;

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;

/*
 * #%L
 * rapidoid-json
 * %%
 * Copyright (C) 2014 - 2015 Nikolche Mihajlovski
 * %%
 * 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.
 * #L%
 */

@Authors("Nikolche Mihajlovski")
@Since("2.0.0")
public class JSON {

    public static final ObjectMapper MAPPER = mapper();

    private static ObjectMapper mapper() {
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        return mapper;
    }

    public static String jacksonStringify(Object value) {
        try {
            return MAPPER.writeValueAsString(value);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static String stringify(Object value) {
        return jacksonStringify(Beany.serialize(value));
    }

    public static void jacksonStringify(Object value, OutputStream out) {
        try {
            MAPPER.writeValue(out, value);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static void stringify(Object value, OutputStream out) {
        jacksonStringify(Beany.serialize(value), out);
    }

    public static <T> T jacksonParse(String json, Class<T> valueType) {
        try {
            return MAPPER.readValue(json, valueType);
        } catch (Exception e) {
            Log.error("Cannot parse JSON!", "json", json, "error", e);
            throw new RuntimeException(e);
        }
    }

    public static <T> T parse(String json, Class<T> valueType) {
        return jacksonParse(json, valueType);
    }

    @SuppressWarnings("unchecked")
    public static Map<String, Object> parseMap(String json) {
        return parse(json, Map.class);
    }

    public static void warmup() {
        JSON.stringify(123);
        JSON.parse("{}", Map.class);
    }

    public static String save(Object value) {
        Object ser = Beany.serialize(value);
        Class<?> cls = value != null ? value.getClass() : null;
        Map<String, Object> map = U.map("_", cls.getCanonicalName(), "v", ser);
        return jacksonStringify(map);
    }

    @SuppressWarnings("unchecked")
    public static Object load(String json) {
        Map<String, Object> map = parseMap(json);
        String clsName = (String) map.get("_");
        Class<Object> type = Cls.getClassIfExists(clsName);
        if (type == null) {
            return null;
        }

        Object ser = map.get("v");

        if (ser instanceof Map) {
            Object value = Cls.newInstance(type);
            Map<String, Object> props = (Map<String, Object>) ser;
            Beany.update(value, props, false);
            return value;
        }

        return ser;
    }

}