content: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * 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 com.android.ahat;
  
  import com.google.common.io.ByteStreams;
  import com.sun.net.httpserver.HttpExchange;
  import com.sun.net.httpserver.HttpHandler;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.PrintStream;
  
  /**
   * HelpHandler.
   *
   * HttpHandler to show the help page.
   */
  class HelpHandler implements HttpHandler {
  
    @Override
    public void handle(HttpExchange exchange) throws IOException {
      ClassLoader loader = HelpHandler.class.getClassLoader();
      exchange.getResponseHeaders().add("Content-Type", "text/html;charset=utf-8");
      exchange.sendResponseHeaders(200, 0);
      PrintStream ps = new PrintStream(exchange.getResponseBody());
      HtmlDoc doc = new HtmlDoc(ps, DocString.text("ahat"), DocString.uri("style.css"));
      doc.menu(Menu.getMenu());
  
      InputStream is = loader.getResourceAsStream("help.html");
      if (is == null) {
        ps.println("No help available.");
      } else {
        ByteStreams.copy(is, ps);
      }
  
      doc.close();
      ps.close();
    }
  }
  