com.github.mjeanroy.dbunit.json.GsonParser.java Source code

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Here is the source code for com.github.mjeanroy.dbunit.json.GsonParser.java

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/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 Mickael Jeanroy
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.github.mjeanroy.dbunit.json;

import com.github.mjeanroy.dbunit.exception.JsonException;
import com.google.gson.Gson;
import com.google.gson.JsonIOException;
import com.google.gson.JsonSyntaxException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.Reader;
import java.util.List;
import java.util.Map;

import static com.github.mjeanroy.dbunit.commons.lang.PreConditions.notNull;

/**
 * Json Parser using Google Gson as internal implementation.
 */
public class GsonParser implements JsonParser {

    /**
     * Class Logger.
     */
    private static final Logger log = LoggerFactory.getLogger(GsonParser.class);

    /**
     * Internal parser.
     */
    private final Gson gson;

    /**
     * Create parser using default Gson mapper.
     */
    GsonParser() {
        this(new Gson());
    }

    /**
     * Create parser using specific Gson mapper.
     *
     * @param gson Gson Mapper.
     * @throws NullPointerException If {@code gson} is {@code null}.
     */
    public GsonParser(Gson gson) {
        this.gson = notNull(gson, "Gson Parser should not be null");
    }

    @Override
    @SuppressWarnings("unchecked")
    public Map<String, List<Map<String, Object>>> parse(File input) throws JsonException {
        try {
            Reader fileReader = new FileReader(input);
            return (Map<String, List<Map<String, Object>>>) gson.fromJson(fileReader, Map.class);
        } catch (FileNotFoundException ex) {
            log.error(ex.getMessage(), ex);
            throw new JsonException(ex);
        } catch (JsonSyntaxException ex) {
            log.error(ex.getMessage(), ex);
            throw new JsonException(ex);
        } catch (JsonIOException ex) {
            log.error(ex.getMessage(), ex);
            throw new JsonException(ex);
        }
    }
}