/*
 * Copyright (c) 2010-2026 Contributors to the openHAB project
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 */
package org.openhab.binding.avmfritz.internal.dto.json;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Objects;

import org.eclipse.jdt.annotation.NonNullByDefault;

import com.google.gson.Gson;

/**
 * Abstract Test cases for Plain Old Java Objects.
 *
 * @author Christoph Weitkamp - Initial contribution
 */
@NonNullByDefault
public abstract class AbstractJSONTest {

    protected final Gson gson = new Gson();

    protected <T> T getObjectFromJson(String filename, Class<T> clazz, Gson gson) throws IOException {
        try (InputStream inputStream = AbstractJSONTest.class.getResourceAsStream(filename)) {
            if (inputStream == null) {
                throw new IOException("InputStream is null");
            }
            byte[] bytes = inputStream.readAllBytes();
            if (bytes == null) {
                throw new IOException("Resulting byte-array empty");
            }
            String json = new String(bytes, StandardCharsets.UTF_8);
            return Objects.requireNonNull(gson.fromJson(json, clazz));
        }
    }
}
