An utility class for parsing json objects using Jackson data binding library

JsonParser.java

package ru.trendico.biggame.utils;

import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.TypeFactory;

import java.io.IOException;
import java.util.ArrayList;

/**
 * An utility class for parsing json objects using Jackson data binding library
 *
 * @author Artemii Vishnevskii
 * @author [email protected]
 * @since 12.04.2016.
 */
public class JsonParser {

    private static ObjectMapper mObjectMapper;

    /**
     * Creates an {@link ObjectMapper} for mapping json objects. Mapper can be configured here
     *
     * @return created {@link ObjectMapper}
     */
    private static ObjectMapper getMapper() {
        if (mObjectMapper == null) {
            mObjectMapper = new ObjectMapper();
        }
        return mObjectMapper;
    }

    /**
     * Maps json string to specified class
     *
     * @param json   string to parse
     * @param tClass class of object in which json will be parsed
     * @param <T>    generic parameter for tClass
     * @return mapped T class instance
     * @throws IOException
     */
    public static <T> T entity(String json, Class<T> tClass) throws IOException {
        return getMapper().readValue(json, tClass);
    }

    /**
     * Maps json string to {@link ArrayList} of specified class object instances
     *
     * @param json   string to parse
     * @param tClass class of object in which json will be parsed
     * @param <T>    generic parameter for tClass
     * @return mapped T class instance
     * @throws IOException
     */
    public static <T> ArrayList<T> arrayList(String json, Class<T> tClass) throws IOException {
        TypeFactory typeFactory = getMapper().getTypeFactory();
        JavaType type = typeFactory.constructCollectionType(ArrayList.class, tClass);
        return getMapper().readValue(json, type);
    }

    /**
     * Writes specified object as string
     *
     * @param object object to write
     * @return result json
     * @throws IOException
     */
    public static String toJson(Object object) throws IOException {
        return getMapper().writeValueAsString(object);
    }
}