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ExtentReports generation from Cucumber JSON report

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package tech.grasshopper.json;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

import javax.inject.Inject;
import javax.inject.Singleton;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonIOException;
import com.google.gson.JsonSyntaxException;

import tech.grasshopper.exception.ExtentReportsCucumberPluginException;
import tech.grasshopper.json.deserializer.EmbeddedDeserializer;
import tech.grasshopper.logging.ExtentReportsCucumberLogger;
import tech.grasshopper.pojo.Embedded;
import tech.grasshopper.pojo.Feature;
import tech.grasshopper.properties.ReportProperties;

@Singleton
public class JsonFileConverter {

	private ExtentReportsCucumberLogger logger;
	private ReportProperties reportProperties;

	@Inject
	public JsonFileConverter(ExtentReportsCucumberLogger logger, ReportProperties reportProperties) {
		this.logger = logger;
		this.reportProperties = reportProperties;
	}

	public List retrieveFeaturesFromReport(List jsonFilePaths) {
		Gson gson = new GsonBuilder()
				.registerTypeAdapter(Embedded.class, new EmbeddedDeserializer(reportProperties, logger)).create();

		List features = new ArrayList<>();
		Feature[] parsedFeatures = null;

		for (Path jsonFilePath : jsonFilePaths) {

			try {
				parsedFeatures = gson.fromJson(Files.newBufferedReader(jsonFilePath), Feature[].class);
			} catch (JsonSyntaxException | JsonIOException | IOException e) {
				logger.warn(String.format(
						"Skipping json report at '%s', as unable to parse json report file to Feature pojo.",
						jsonFilePath));
				continue;
			}

			if (parsedFeatures == null || parsedFeatures.length == 0) {
				logger.warn(String.format(
						"Skipping json report at '%s', parsing json report file returned no Feature pojo.",
						jsonFilePath));
				continue;
			}
			features.addAll(Arrays.asList(parsedFeatures));
		}

		if (features.size() == 0)
			throw new ExtentReportsCucumberPluginException("No Feature found in report. Stopping report creation. "
					+ "Check the 'extentreport.cucumberJsonReportDirectory' plugin configuration.");

		if (!features.stream().flatMap(f -> f.getElements().stream())
				.filter(s -> !s.getKeyword().equalsIgnoreCase("Background")
						&& (s.getStartTimestamp() == null || s.getStartTimestamp().isEmpty()))
				.collect(Collectors.toList()).isEmpty())
			throw new ExtentReportsCucumberPluginException(
					"Start timestamp data of scenario is essential but is missing in json report. "
							+ "Plugin only generates report for Cucumber-JVM 4.3.0 and above. "
							+ "If Cucumber version is in the valid range, do submit an issue.");
		return features;
	}
}