com.epam.dlab.automation.model.JsonMapperDto.java Source code

Introduction

Here is the source code for com.epam.dlab.automation.model.JsonMapperDto.java

Source

/***************************************************************************
    
Copyright (c) 2016, EPAM SYSTEMS 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.epam.dlab.automation.model;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.CollectionType;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.google.gson.JsonParseException;

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

public class JsonMapperDto {

    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();

    private JsonMapperDto() {
    }

    @SuppressWarnings("unchecked")
    public static <T> T readNode(String pathToJson, Class<T> clasz) throws IOException {
        try (FileInputStream in = new FileInputStream(pathToJson)) {
            return OBJECT_MAPPER.readerFor(clasz).readValue(in);
        }
    }

    public static <T> List<T> readListOf(String pathToJson, Class<T> clasz) {
        try (FileInputStream in = new FileInputStream(pathToJson)) {
            CollectionType typeReference = TypeFactory.defaultInstance().constructCollectionType(List.class, clasz);
            return OBJECT_MAPPER.readValue(in, typeReference);
        } catch (IOException e) {
            throw new JsonParseException("Cannot read json file", e);
        }
    }

    public static <T> T readObject(String pathToJson, Class<T> clasz) {
        try (FileInputStream in = new FileInputStream(pathToJson)) {
            return OBJECT_MAPPER.readValue(in, clasz);
        } catch (IOException e) {
            throw new JsonParseException("Cannot read json file", e);
        }
    }
}