[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | package org.apache.hadoop.util; |
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| 19 | |
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| 20 | import java.io.*; |
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| 21 | import java.util.Calendar; |
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| 22 | |
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| 23 | import javax.servlet.*; |
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| 24 | |
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| 25 | public class ServletUtil { |
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| 26 | /** |
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| 27 | * Initial HTML header |
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| 28 | */ |
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| 29 | public static PrintWriter initHTML(ServletResponse response, String title |
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| 30 | ) throws IOException { |
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| 31 | response.setContentType("text/html"); |
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| 32 | PrintWriter out = response.getWriter(); |
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| 33 | out.println("<html>\n" |
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| 34 | + "<link rel='stylesheet' type='text/css' href='/static/hadoop.css'>\n" |
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| 35 | + "<title>" + title + "</title>\n" |
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| 36 | + "<body>\n" |
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| 37 | + "<h1>" + title + "</h1>\n"); |
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| 38 | return out; |
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| 39 | } |
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| 40 | |
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| 41 | /** |
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| 42 | * Get a parameter from a ServletRequest. |
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| 43 | * Return null if the parameter contains only white spaces. |
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| 44 | */ |
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| 45 | public static String getParameter(ServletRequest request, String name) { |
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| 46 | String s = request.getParameter(name); |
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| 47 | if (s == null) { |
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| 48 | return null; |
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| 49 | } |
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| 50 | s = s.trim(); |
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| 51 | return s.length() == 0? null: s; |
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| 52 | } |
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| 53 | |
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| 54 | public static final String HTML_TAIL = "<hr />\n" |
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| 55 | + "<a href='http://hadoop.apache.org/core'>Hadoop</a>, " |
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| 56 | + Calendar.getInstance().get(Calendar.YEAR) + ".\n" |
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| 57 | + "</body></html>"; |
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| 58 | |
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| 59 | /** |
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| 60 | * HTML footer to be added in the jsps. |
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| 61 | * @return the HTML footer. |
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| 62 | */ |
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| 63 | public static String htmlFooter() { |
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| 64 | return HTML_TAIL; |
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| 65 | } |
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| 66 | |
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| 67 | /** |
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| 68 | * Generate the percentage graph and returns HTML representation string |
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| 69 | * of the same. |
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| 70 | * |
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| 71 | * @param perc The percentage value for which graph is to be generated |
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| 72 | * @param width The width of the display table |
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| 73 | * @return HTML String representation of the percentage graph |
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| 74 | * @throws IOException |
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| 75 | */ |
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| 76 | public static String percentageGraph(int perc, int width) throws IOException { |
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| 77 | assert perc >= 0; assert perc <= 100; |
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| 78 | |
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| 79 | StringBuilder builder = new StringBuilder(); |
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| 80 | |
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| 81 | builder.append("<table border=\"1px\" width=\""); builder.append(width); |
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| 82 | builder.append("px\"><tr>"); |
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| 83 | if(perc > 0) { |
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| 84 | builder.append("<td cellspacing=\"0\" class=\"perc_filled\" width=\""); |
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| 85 | builder.append(perc); builder.append("%\"></td>"); |
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| 86 | }if(perc < 100) { |
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| 87 | builder.append("<td cellspacing=\"0\" class=\"perc_nonfilled\" width=\""); |
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| 88 | builder.append(100 - perc); builder.append("%\"></td>"); |
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| 89 | } |
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| 90 | builder.append("</tr></table>"); |
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| 91 | return builder.toString(); |
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| 92 | } |
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| 93 | |
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| 94 | /** |
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| 95 | * Generate the percentage graph and returns HTML representation string |
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| 96 | * of the same. |
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| 97 | * @param perc The percentage value for which graph is to be generated |
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| 98 | * @param width The width of the display table |
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| 99 | * @return HTML String representation of the percentage graph |
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| 100 | * @throws IOException |
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| 101 | */ |
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| 102 | public static String percentageGraph(float perc, int width) throws IOException { |
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| 103 | return percentageGraph((int)perc, width); |
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| 104 | } |
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| 105 | } |
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