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There is a newer version: 3.9.1

/*
Copyright 2012 Selenium committers
Copyright 2012 Software Freedom Conservancy

Licensed 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.openqa.selenium.server;

import org.openqa.jetty.util.IO;
import org.openqa.jetty.util.URLResource;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Represents a sessioned extension Javascript resource. This class provides just enough canned
 * return values for the purpose of being passed into ResourceHandler.sendData(), and is not
 * guaranteed to hold water for anything else!
 */
class SessionExtensionJsResource extends URLResource {
  private String extensionJs;

  public SessionExtensionJsResource(String extensionJs)
      throws MalformedURLException {
    super(new URL("http://seleniumhq.org"), null);
    this.extensionJs = extensionJs;
  }

  @Override
  public boolean exists() {
    return true;
  }

  @Override
  public boolean isDirectory() {
    return false;
  }

  /**
   * Returns the lastModified time, which is always in the distant future to prevent caching. This
   * comes from FutureFileResource originally.
   */
  @Override
  public long lastModified() {
    return System.currentTimeMillis() + (1000L * 3600L * 24L * 365L * 12L);
  }

  @Override
  public long length() {
    return extensionJs.length();
  }

  /**
   * This is basically a copy of Resource.writeTo() .
   */
  @Override
  public void writeTo(OutputStream out, long start, long count)
      throws IOException {
    // TODO(flight): I think this is equivalent.
    // The original code used a StringInputStream from Ant

    InputStream in = new ByteArrayInputStream(extensionJs.getBytes());

    try {
      in.skip(start);
      if (count < 0)
        IO.copy(in, out);
      else
        IO.copy(in, out, (int) count);
    } finally {
      in.close();
    }
  }
}