/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.avro.ipc.trace;

import java.io.IOException;
import java.net.URL;

import org.mortbay.jetty.servlet.DefaultServlet;
import org.mortbay.resource.Resource;

/**
 * Very simple servlet class capable of serving static files.
 */
public class StaticServlet extends DefaultServlet {
  public Resource getResource(String pathInContext) {
    // Take only last slice of the URL as a filename, so we can adjust path. 
    // This also prevents mischief like '../../foo.css'
    String[] parts = pathInContext.split("/");
    
    if (parts.length == 0) {
      return null;
    }
    String filename =  parts[parts.length - 1];

    try {
      URL resource = getClass().getClassLoader().getResource(
          "org/apache/avro/ipc/trace/static/" + filename);
      if (resource == null) { return null; }
      return Resource.newResource(resource);
    } catch (IOException e) {
      return null;
    }
  }
} 
