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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, 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) 2006-2012 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.startup;

import java.io.*;
import java.net.*;
import java.util.*;
import java.util.Map.Entry;

final class StartupConfiguration
{
   private static final Iterable NO_VALUES = Collections.emptyList();

   private final Properties config;
   final Iterable externalTools;
   final Iterable classesToBeStubbedOut;
   final Iterable mockClasses;

   StartupConfiguration() throws IOException
   {
      config = new Properties();

      loadJMockitPropertiesFilesFromClasspath();
      loadJMockitPropertiesIntoSystemProperties();

      externalTools = getMultiValuedProperty("jmockit-tools");
      classesToBeStubbedOut = getMultiValuedProperty("jmockit-stubs");
      mockClasses = getMultiValuedProperty("jmockit-mocks");
   }

   private void loadJMockitPropertiesFilesFromClasspath() throws IOException
   {
      Enumeration allFiles = Thread.currentThread().getContextClassLoader().getResources("jmockit.properties");
      int numFiles = 0;

      while (allFiles.hasMoreElements()) {
         URL url = allFiles.nextElement();
         InputStream propertiesFile = url.openStream();

         if (numFiles == 0) {
            try { config.load(propertiesFile); } finally { propertiesFile.close(); }
         }
         else {
            Properties properties = new Properties();
            try { properties.load(propertiesFile); } finally { propertiesFile.close(); }
            addPropertyValues(properties);
         }

         numFiles++;
      }
   }

   private void addPropertyValues(Properties propertiesToAdd)
   {
      for (Entry propertyToAdd : propertiesToAdd.entrySet()) {
         Object key = propertyToAdd.getKey();
         String valueToAdd = (String) propertyToAdd.getValue();
         String existingValue = (String) config.get(key);
         String newValue;

         if (existingValue == null || existingValue.length() == 0) {
            newValue = valueToAdd;
         }
         else {
            newValue = existingValue + ' ' + valueToAdd;
         }

         config.put(key, newValue);
      }
   }

   private void loadJMockitPropertiesIntoSystemProperties()
   {
      Properties systemProperties = System.getProperties();

      for (Entry prop : config.entrySet()) {
         String key = (String) prop.getKey();
         String name = key.startsWith("jmockit-") ? key : "jmockit-" + key;

         if (!systemProperties.containsKey(name)) {
            systemProperties.put(name, prop.getValue());
         }
      }
   }

   private Iterable getMultiValuedProperty(String key)
   {
      String commaOrSpaceSeparatedValues = System.getProperty(key);
      
      if (commaOrSpaceSeparatedValues == null) {
         return NO_VALUES;
      }

      List allValues = Arrays.asList(commaOrSpaceSeparatedValues.split("\\s*,\\s*|\\s+"));
      Set uniqueValues = new HashSet(allValues);
      uniqueValues.remove("");

      return uniqueValues;
   }
}