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Liferay Batch Engine Service

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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 Lesser General Public License for more
 * details.
 */

package com.liferay.batch.engine.internal.task.progress;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

import com.liferay.batch.engine.internal.util.ZipInputStreamUtil;
import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;

import java.io.IOException;
import java.io.InputStream;

import java.util.Map;

/**
 * @author Matija Petanjek
 */
public class JSONBatchEngineTaskProgressImpl
	implements BatchEngineTaskProgress {

	@Override
	public int getTotalItemsCount(InputStream inputStream) {
		int totalItemsCount = 0;

		JsonParser jsonParser = null;

		try {
			inputStream = ZipInputStreamUtil.asZipInputStream(inputStream);

			jsonParser = _jsonFactory.createParser(inputStream);

			jsonParser.nextToken();

			while (jsonParser.nextToken() == JsonToken.START_OBJECT) {
				_objectMapper.readValue(
					jsonParser,
					new TypeReference>() {
					});

				totalItemsCount++;
			}
		}
		catch (Exception exception) {
			_log.error("Unable to get total items count", exception);

			totalItemsCount = 0;
		}
		finally {
			try {
				if (jsonParser != null) {
					jsonParser.close();
				}
			}
			catch (IOException ioException) {
				_log.error(ioException, ioException);
			}
		}

		return totalItemsCount;
	}

	private static final Log _log = LogFactoryUtil.getLog(
		JSONBatchEngineTaskProgressImpl.class);

	private static final JsonFactory _jsonFactory = new JsonFactory();
	private static final ObjectMapper _objectMapper = new ObjectMapper();

}