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/*
 * JMockit
 * Copyright (c) 2006-2010 Rogério Liesenfeld
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package mockit.internal.startup;

import java.io.*;
import java.util.regex.*;

public final class AgentInitialization
{
   private static final Pattern JAR_REGEX = Pattern.compile(".*jmockit[-.\\w]*.jar");

   public void initializeAccordingToJDKVersion()
   {
      String jarFilePath = findPathToJarFileFromClasspath();

      if (Startup.jdk6OrLater) {
         new JDK6AgentLoader(jarFilePath).loadAgent();
      }
      else if ("1.5".equals(Startup.javaSpecVersion)) {
         throw new IllegalStateException(
            "JMockit has not been initialized. Check that your Java 5 VM has been started " +
            "with the -javaagent:" + jarFilePath + " command line option.");
      }
      else {
         throw new IllegalStateException("JMockit requires a Java 5 VM or later.");
      }
   }

   private String findPathToJarFileFromClasspath()
   {
      String[] classPath = System.getProperty("java.class.path").split(File.pathSeparator);

      for (String cpEntry : classPath) {
         if (JAR_REGEX.matcher(cpEntry).matches()) {
            return cpEntry;
         }
      }

      throw new IllegalStateException(
         "No jar file with name ending in \"jmockit.jar\" or \"jmockit-nnn.jar\" (where \"nnn\" " +
         "is a version number) found in the classpath");
   }
}