package liquibase.integration.ant;

 import liquibase.resource.ResourceAccessor;

 import org.apache.tools.ant.AntClassLoader;

 import org.apache.tools.ant.Project;

 import org.apache.tools.ant.types.Path;

 import java.io.IOException;

 import java.io.InputStream;

 import java.net.URL;

 import java.security.AccessController;

 import java.security.PrivilegedAction;

 import java.util.Enumeration;

 /**

  * An implementation of FileOpener that is specific to how Ant works.

  */

 public class AntResourceAccessor implements ResourceAccessor {

     private AntClassLoader loader;

     public AntResourceAccessor(final Project project, final Path classpath) {

         loader = AccessController.doPrivileged(new PrivilegedAction<AntClassLoader>() {

             public AntClassLoader run() {

                 return new AntClassLoader(project, classpath);

             }

         });

     }

     public InputStream getResourceAsStream(String file) throws IOException {

         URL resource = loader.getResource(file);

         if (resource == null) {

             return null;

         }

         return resource.openStream();

     }

     public Enumeration<URL> getResources(String packageName) throws IOException {

         return loader.getResources(packageName);

     }

     public ClassLoader toClassLoader() {

         return loader;

     }

     @Override

     public String toString() {

         return getClass().getName() + "(" + loader.getClasspath() + ")";

     }

 }