/**
    * copyright by Grandsoft Company Limited.  
    * 2011-12-31
    */
   package gboat2.base.core;
   
   import gboat2.base.core.exception.NouniqueActionException;
   
   import java.util.HashMap;
  import java.util.Map;
  
  import org.osgi.framework.Bundle;
  
  public final class GBoatClassLoader extends ClassLoader {
  
  	//todo
  	private static GBoatClassLoader _classLoader = new GBoatClassLoader();
  
  	private static Map<String, Bundle> bundleClassLoaders = new HashMap<String, Bundle>();
  
  	private static Map<String, String> bundleActionPackage = new HashMap<String, String>();
  
  	private GBoatClassLoader() {
  	}
  
  	public static GBoatClassLoader getInstance() {
  		return _classLoader;
  	}
  
  	public void add(String packageName, Bundle bundle) {
  		String bundleName = bundle.getSymbolicName();
  		Bundle finalBundle = bundleClassLoaders.get(packageName);
  		if (null == finalBundle) {
  			bundleClassLoaders.put(packageName, bundle);
  			bundleActionPackage.put(bundleName, packageName);
  		} else {
  			if (bundle.getSymbolicName().equals(finalBundle.getSymbolicName())) {
  				bundleClassLoaders.put(packageName, bundle);
  				bundleActionPackage.put(bundleName, packageName);
  			} else {
  				throw new NouniqueActionException("there are more than one package named " + packageName + " in different bundle!");
  			}
  		}
  	}
  	
  	public Bundle getBundle(String packageName) {
  		return bundleClassLoaders.get(packageName);
  	}
  
  	/**
  	 * 
  	 * 根据Bundle名称获取该Bundle下的Action包名
  	 * @param bundleName
  	 * @return
  	 */
  	public String getActionPackage(String bundleName) {
  		return bundleActionPackage.get(bundleName);
  	}
  
  	public Class<?> findClass(String className) throws ClassNotFoundException {
  		if (className.indexOf(".") != -1) {
  			String packageName = className.substring(0, className.lastIndexOf("."));
  			if (bundleClassLoaders.containsKey(packageName)) {
  				Bundle bundle = bundleClassLoaders.get(packageName);
  				if (bundle != null) {
  					return bundle.loadClass(className);
  				}
  			}
  		} else {
  			throw new ClassNotFoundException(className + " should have a package.");
  		}
  
  		throw new ClassNotFoundException(className);
  	}
  
  	public Map<String, Bundle> getBundleClassLoaders() {
  		return bundleClassLoaders;
  	}
  
  	public Map<String, String> getBundleActionPackage() {
  		return bundleActionPackage;
  	}
  }