package com.atlassian.plugin.impl;
   
   import com.atlassian.plugin.JarPluginArtifact;
   import com.atlassian.plugin.PluginArtifact;
   import com.atlassian.plugin.classloader.PluginClassLoader;
   import com.atlassian.plugin.loaders.classloading.DeploymentUnit;
   
   import java.io.InputStream;
   import java.net.URL;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  
  /**
   * A dynamically loaded plugin is loaded through the plugin class loader.
   */
  public class DefaultDynamicPlugin extends AbstractPlugin {
      private final PluginClassLoader loader;
  
      public DefaultDynamicPlugin(final DeploymentUnit deploymentUnit, final PluginClassLoader loader) {
          this(new JarPluginArtifact(deploymentUnit.getPath()), loader);
      }
  
      public DefaultDynamicPlugin(final PluginArtifact pluginArtifact, final PluginClassLoader loader) {
          super(checkNotNull(pluginArtifact));
          this.loader = checkNotNull(loader);
      }
  
      public <T> Class<T> loadClass(final String clazz, final Class<?> callingClass) throws ClassNotFoundException {
          @SuppressWarnings("unchecked")
          final Class<T> result = (Class<T>) loader.loadClass(clazz);
          return result;
      }
  
      public boolean isUninstallable() {
          return true;
      }
  
      public URL getResource(final String name) {
          return loader.getResource(name);
      }
  
      public InputStream getResourceAsStream(final String name) {
          return loader.getResourceAsStream(name);
      }
  
      public ClassLoader getClassLoader() {
          return loader;
      }
  
      /**
       * This plugin is dynamically loaded, so returns true.
       *
       * @return true
       */
      public boolean isDynamicallyLoaded() {
          return true;
      }
  
      public boolean isDeleteable() {
          return true;
      }
  
      @Override
      protected void uninstallInternal() {
          loader.close();
      }
  }