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Utilities for generating JaCoCo and Testwise Coverage reports
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package com.teamscale.report;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.teamscale.client.FileSystemUtils;
import com.teamscale.client.JsonUtils;
import com.teamscale.client.TestDetails;
import com.teamscale.report.testwise.ETestArtifactFormat;
import com.teamscale.report.testwise.model.TestExecution;
import com.teamscale.report.testwise.model.TestwiseCoverageReport;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/** Utilities for generating reports. */
public class ReportUtils {

	/** Converts to given test list to a json report and writes it to the given file. */
	public static void writeTestListReport(File reportFile, List report) throws IOException {
		writeReportToFile(reportFile, report);
	}

	/** Converts to given test execution report to a json report and writes it to the given file. */
	public static void writeTestExecutionReport(File reportFile, List report) throws IOException {
		writeReportToFile(reportFile, report);
	}

	/** Converts to given testwise coverage report to a json report and writes it to the given file. */
	public static void writeTestwiseCoverageReport(File reportFile, TestwiseCoverageReport report) throws IOException {
		writeReportToFile(reportFile, report);
	}

	/** Converts to given report to a json string. For testing only. */
	public static String getTestwiseCoverageReportAsString(
			TestwiseCoverageReport report) throws JsonProcessingException {
		return JsonUtils.serialize(report);
	}

	/** Writes the report object to the given file as json. */
	private static  void writeReportToFile(File reportFile, T report) throws IOException {
		File directory = reportFile.getParentFile();
		if (!directory.isDirectory() && !directory.mkdirs()) {
			throw new IOException("Failed to create directory " + directory.getAbsolutePath());
		}
		JsonUtils.serializeToFile(reportFile, report);
	}

	/** Recursively lists all files in the given directory that match the specified extension. */
	public static  List readObjects(ETestArtifactFormat format, Class clazz,
										  List directoriesOrFiles) throws IOException {
		List files = listFiles(format, directoriesOrFiles);
		ArrayList result = new ArrayList<>();
		for (File file : files) {
			T[] t = JsonUtils.deserializeFile(file, clazz);
			if (t != null) {
				result.addAll(Arrays.asList(t));
			}
		}
		return result;
	}

	/** Recursively lists all files of the given artifact type. */
	public static List listFiles(ETestArtifactFormat format, List directoriesOrFiles) {
		List filesWithSpecifiedArtifactType = new ArrayList<>();
		for (File directoryOrFile : directoriesOrFiles) {
			if (directoryOrFile.isDirectory()) {
				filesWithSpecifiedArtifactType.addAll(FileSystemUtils
						.listFilesRecursively(directoryOrFile, file -> fileIsOfArtifactFormat(file, format)));
			} else if (fileIsOfArtifactFormat(directoryOrFile, format)) {
				filesWithSpecifiedArtifactType.add(directoryOrFile);
			}
		}
		return filesWithSpecifiedArtifactType;
	}

	private static boolean fileIsOfArtifactFormat(File file, ETestArtifactFormat format) {
		return file.isFile() &&
				file.getName().startsWith(format.filePrefix) &&
				FileSystemUtils.getFileExtension(file).equalsIgnoreCase(format.extension);
	}
}