package com.atlassian.plugin;
   
   import java.io.File;
   import java.net.URI;
   
   /**
    * Creates plugin artifacts by handling URI's that are files and looking at the file's extension
    *
    * @since 2.1.0
   */
  public class DefaultPluginArtifactFactory implements PluginArtifactFactory
  {
      /**
       * Creates the artifact by looking at the file extension
       *
       * @param artifactUri The artifact URI
       * @return The created artifact
       * @throws IllegalArgumentException If an artifact cannot be created from the URL
       */
      public PluginArtifact create(URI artifactUri)
      {
          PluginArtifact artifact = null;
  
          String protocol = artifactUri.getScheme();
  
          if ("file".equalsIgnoreCase(protocol))
          {
              File artifactFile = new File(artifactUri);
             
              String file = artifactFile.getName();
              if (file.endsWith(".jar"))
                  artifact = new JarPluginArtifact(artifactFile);
              else if (file.endsWith(".xml"))
                  artifact = new XmlPluginArtifact(artifactFile);
          }
  
          if (artifact == null)
              throw new IllegalArgumentException("The artifact URI " + artifactUri + " is not a valid plugin artifact");
          
          return artifact;
      }
  }