source: proiecte/HadoopJUnit/hadoop-0.20.1/src/core/org/apache/hadoop/util/ServletUtil.java @ 120

Last change on this file since 120 was 120, checked in by (none), 14 years ago

Added the mail files for the Hadoop JUNit Project
  • Property svn:executable set to *
File size: 3.5 KB
Line 
1/**
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements.  See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership.  The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License.  You may obtain a copy of the License at
9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18package org.apache.hadoop.util;
19
20import java.io.*;
21import java.util.Calendar;
22
23import javax.servlet.*;
24
25public class ServletUtil {
26  /**
27   * Initial HTML header
28   */
29  public static PrintWriter initHTML(ServletResponse response, String title
30      ) throws IOException {
31    response.setContentType("text/html");
32    PrintWriter out = response.getWriter();
33    out.println("<html>\n"
34        + "<link rel='stylesheet' type='text/css' href='/static/hadoop.css'>\n"
35        + "<title>" + title + "</title>\n"
36        + "<body>\n"
37        + "<h1>" + title + "</h1>\n");
38    return out;
39  }
40
41  /**
42   * Get a parameter from a ServletRequest.
43   * Return null if the parameter contains only white spaces.
44   */
45  public static String getParameter(ServletRequest request, String name) {
46    String s = request.getParameter(name);
47    if (s == null) {
48      return null;
49    }
50    s = s.trim();
51    return s.length() == 0? null: s;
52  }
53
54  public static final String HTML_TAIL = "<hr />\n"
55    + "<a href='http://hadoop.apache.org/core'>Hadoop</a>, " 
56    + Calendar.getInstance().get(Calendar.YEAR) + ".\n"
57    + "</body></html>";
58 
59  /**
60   * HTML footer to be added in the jsps.
61   * @return the HTML footer.
62   */
63  public static String htmlFooter() {
64    return HTML_TAIL;
65  }
66 
67  /**
68   * Generate the percentage graph and returns HTML representation string
69   * of the same.
70   *
71   * @param perc The percentage value for which graph is to be generated
72   * @param width The width of the display table
73   * @return HTML String representation of the percentage graph
74   * @throws IOException
75   */
76  public static String percentageGraph(int perc, int width) throws IOException {
77    assert perc >= 0; assert perc <= 100;
78
79    StringBuilder builder = new StringBuilder();
80
81    builder.append("<table border=\"1px\" width=\""); builder.append(width);
82    builder.append("px\"><tr>");
83    if(perc > 0) {
84      builder.append("<td cellspacing=\"0\" class=\"perc_filled\" width=\"");
85      builder.append(perc); builder.append("%\"></td>");
86    }if(perc < 100) {
87      builder.append("<td cellspacing=\"0\" class=\"perc_nonfilled\" width=\"");
88      builder.append(100 - perc); builder.append("%\"></td>");
89    }
90    builder.append("</tr></table>");
91    return builder.toString();
92  }
93 
94  /**
95   * Generate the percentage graph and returns HTML representation string
96   * of the same.
97   * @param perc The percentage value for which graph is to be generated
98   * @param width The width of the display table
99   * @return HTML String representation of the percentage graph
100   * @throws IOException
101   */
102  public static String percentageGraph(float perc, int width) throws IOException {
103    return percentageGraph((int)perc, width);
104  }
105}
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