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JMockit is a Java toolkit for automated developer testing. It contains mocking/faking APIs and a code coverage tool, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright (c) 2006 JMockit developers
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.coverage;

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

import mockit.coverage.data.*;

final class DataFileMerging
{
   @Nonnull private final List inputFiles;

   DataFileMerging(@Nonnull String[] inputPaths) {
      inputFiles = new ArrayList<>(inputPaths.length);

      for (String path : inputPaths) {
         addInputFileToList(path.trim());
      }
   }

   private void addInputFileToList(@Nonnull String path) {
      if (!path.isEmpty()) {
         File inputFile = new File(path);

         if (inputFile.isDirectory()) {
            inputFile = new File(inputFile, "coverage.ser");
         }

         inputFiles.add(inputFile);
      }
   }

   @Nonnull
   CoverageData merge() throws IOException {
      CoverageData mergedData = null;

      for (File inputFile : inputFiles) {
         if (inputFile.exists()) {
            CoverageData existingData = CoverageData.readDataFromFile(inputFile);

            if (mergedData == null) {
               mergedData = existingData;
            }
            else {
               mergedData.merge(existingData);
            }
         }
      }

      if (mergedData == null) {
         throw new IllegalArgumentException("No input \"coverage.ser\" files found");
      }

      return mergedData;
   }
}