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JMockit Coverage is a code coverage tool with several metrics (line, path, data) capable of generating HTML reports. It is designed with ease of use in mind, avoiding the need for complex configuration. Instead, smart (but overridable) defaults are employed, such as the selection of which classes to consider for coverage, and where to find sources files for report generation.

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/*
 * Copyright (c) 2006-2015 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.coverage.reporting;

import java.io.*;
import java.util.*;
import javax.annotation.*;

final class SourceFiles
{
   @Nonnull private final List srcDirs = new ArrayList();

   @Nonnull
   List buildListOfSourceDirectories(@Nonnull String[] sourceDirs)
   {
      if (sourceDirs.length > 0) {
         buildListWithSpecifiedDirectories(sourceDirs);
      }
      else {
         buildListWithAllSrcSubDirectories();
      }

      return srcDirs;
   }

   private void buildListWithSpecifiedDirectories(@Nonnull String[] dirs)
   {
      for (String dir : dirs) {
         File srcDir = new File(dir);

         if (srcDir.isDirectory()) {
            srcDirs.add(srcDir);
         }
      }

      if (srcDirs.isEmpty()) {
         throw new IllegalStateException("None of the specified source directories exist");
      }
   }

   private void buildListWithAllSrcSubDirectories()
   {
      String curDirName = new File(System.getProperty("user.dir")).getName();
      addSrcSubDirs(new File("../" + curDirName));
   }

   private void addSrcSubDirs(@Nonnull File dir)
   {
      File[] files = dir.listFiles();
      if (files == null) return;

      for (File subDir : files) {
         if (subDir.isDirectory()) {
            String subDirName = subDir.getName();

            if (!"test generated-sources".contains(subDirName)) {
               if ("src".equals(subDirName)) {
                  srcDirs.add(subDir);
               }
               else {
                  addSrcSubDirs(subDir);
               }
            }
         }
      }
   }
}