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ObServe Toolkit Common Dto module

There is a newer version: 4.34

package fr.ird.observe.gson;

/*
 * #%L
 * ObServe Toolkit :: Common Dto
 * %%
 * Copyright (C) 2017 - 2020 IRD, Ultreia.io
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import com.google.gson.JsonSyntaxException;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;

import java.io.IOException;

/**
 * @author Arnaud Thimel : [email protected]
 */
public class IntegerAdapter extends TypeAdapter {
    @Override
    public void write(JsonWriter out, Integer value) throws IOException {
        out.value(value);
    }

    @Override
    public Integer read(JsonReader in) throws IOException {
        if (in.peek() == JsonToken.NULL) {
            in.nextNull();
            return null;
        }
        try {
            String result = in.nextString();
            if ("".equals(result)) {
                return null;
            }
            return Integer.valueOf(result);
        } catch (NumberFormatException e) {
            throw new JsonSyntaxException(e);
        }
    }
}