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 
17 package com.android.ahat;
18 
19 import com.google.common.io.ByteStreams;
20 import com.sun.net.httpserver.HttpExchange;
21 import com.sun.net.httpserver.HttpHandler;
22 import java.io.IOException;
23 import java.io.InputStream;
24 import java.io.PrintStream;
25 
26 /**
27  * HelpHandler.
28  *
29  * HttpHandler to show the help page.
30  */
31 class HelpHandler implements HttpHandler {
32 
33   @Override
handle(HttpExchange exchange)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