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package fxlauncher;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;

/** Created by im on 22.02.17. */
public class FxlauncherClassCloader extends URLClassLoader {
  public FxlauncherClassCloader(ClassLoader parentClassLoader) {
    super(buildClasspath(System.getProperty("java.class.path")), parentClassLoader);
  }

  void addUrls(List urls) {
    for (URL url : urls) {
      this.addURL(url);
    }
  }

  private static URL[] buildClasspath(String classPath) {
    int pos;
    List urls = new ArrayList<>();

    if (classPath == null || classPath.trim().length() < 1) {
      return new URL[0];
    }

    while ((pos = classPath.indexOf(File.pathSeparatorChar)) > -1) {
      String part = classPath.substring(0, pos);

      addClasspathPart(urls, part);

      classPath = classPath.substring(pos + 1);
    }

    addClasspathPart(urls, classPath);

    return urls.toArray(new URL[urls.size()]);
  }

  private static void addClasspathPart(List urls, String part) {
    if (part == null || part.trim().length() < 1) {
      return;
    }

    try {
      urls.add(new File(part).toURI().toURL());
    } catch (MalformedURLException e) {
      throw new RuntimeException(e);
    }
  }
}