| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.drill.metastore.rdbms.util; |
| |
| import com.fasterxml.jackson.core.JsonProcessingException; |
| import com.fasterxml.jackson.core.type.TypeReference; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import org.apache.drill.metastore.rdbms.exception.RdbmsMetastoreException; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Converter utility class which helps to convert Metastore metadata objects from / to string value. |
| */ |
| public class ConverterUtil { |
| |
| private static final ObjectMapper MAPPER = new ObjectMapper(); |
| |
| private static final TypeReference<List<String>> LIST_STRING_TYPE_REF = new TypeReference<List<String>>() { |
| }; |
| private static final TypeReference<Map<String, String>> MAP_STRING_STRING_TYPE_REF = new TypeReference<Map<String, String>>() { |
| }; |
| private static final TypeReference<Map<String, Float>> MAP_STRING_FLOAT_TYPE_REF = new TypeReference<Map<String, Float>>() { |
| }; |
| |
| public static <T> String convertToString(T value) { |
| try { |
| return MAPPER.writeValueAsString(value); |
| } catch (JsonProcessingException e) { |
| throw new RdbmsMetastoreException("Unable to convert value to String: " + value); |
| } |
| } |
| |
| public static <T> T convertTo(String value, TypeReference<T> typeReference) { |
| if (value == null) { |
| return null; |
| } |
| try { |
| return MAPPER.readValue(value, typeReference); |
| } catch (IOException e) { |
| throw new RdbmsMetastoreException(String.format("Unable to convert to %s value: %s", |
| typeReference.getType().getTypeName(), value)); |
| } |
| } |
| |
| public static List<String> convertToListString(String value) { |
| return convertTo(value, LIST_STRING_TYPE_REF); |
| } |
| |
| public static Map<String, String> convertToMapStringString(String value) { |
| return convertTo(value, MAP_STRING_STRING_TYPE_REF); |
| } |
| |
| public static Map<String, Float> convertToMapStringFloat(String value) { |
| return convertTo(value, MAP_STRING_FLOAT_TYPE_REF); |
| } |
| } |