/**
 * Copyright 2016 ZTE Corporation.
 *
 * 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 org.openo.carbon.bpel.util;

import java.io.IOException;
import java.io.StringWriter;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonUtil {

  @SuppressWarnings("deprecation")
  public static String bean2Json(Object obj) throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    StringWriter sw = new StringWriter();
    JsonGenerator gen = new JsonFactory().createJsonGenerator(sw);
    mapper.writeValue(gen, obj);
    gen.close();
    return sw.toString();
  }

  public static <T> T json2Bean(String jsonStr, Class<T> objClass)
      throws JsonParseException, JsonMappingException, IOException {
    ObjectMapper mapper = new ObjectMapper();
    return mapper.readValue(jsonStr, objClass);
  }

  @SuppressWarnings("deprecation")
  public static <T> T readJson(String jsonStr, Class<?> collectionClass, Class<?>... elementClasses)
      throws Exception {
    ObjectMapper mapper = new ObjectMapper();
    JavaType javaType =
        mapper.getTypeFactory().constructParametricType(collectionClass, elementClasses);
    return mapper.readValue(jsonStr, javaType);
  }

  public static JsonNode getJsonNode(String json) throws JsonProcessingException, IOException {
    return new ObjectMapper().readTree(json);
  }

}