1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.ahat;
18
19import com.google.common.io.ByteStreams;
20import com.sun.net.httpserver.HttpExchange;
21import com.sun.net.httpserver.HttpHandler;
22import java.io.IOException;
23import java.io.InputStream;
24import java.io.PrintStream;
25
26/**
27 * HelpHandler.
28 *
29 * HttpHandler to show the help page.
30 */
31class HelpHandler implements HttpHandler {
32
33  @Override
34  public void handle(HttpExchange exchange) throws IOException {
35    ClassLoader loader = HelpHandler.class.getClassLoader();
36    exchange.getResponseHeaders().add("Content-Type", "text/html;charset=utf-8");
37    exchange.sendResponseHeaders(200, 0);
38    PrintStream ps = new PrintStream(exchange.getResponseBody());
39    HtmlDoc doc = new HtmlDoc(ps, DocString.text("ahat"), DocString.uri("style.css"));
40    doc.menu(Menu.getMenu());
41
42    InputStream is = loader.getResourceAsStream("help.html");
43    if (is == null) {
44      ps.println("No help available.");
45    } else {
46      ByteStreams.copy(is, ps);
47    }
48
49    doc.close();
50    ps.close();
51  }
52}
53