1 | /**
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2 | *############################################################################
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3 | * A component of the Greenstone Librarian Interface, part of the Greenstone
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4 | * digital library suite from the New Zealand Digital Library Project at the
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5 | * University of Waikato, New Zealand.
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6 | *
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7 | * Author: Michael Dewsnip, NZDL Project, University of Waikato, NZ
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8 | *
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9 | * Copyright (C) 2005 New Zealand Digital Library Project
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10 | *
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11 | * This program is free software; you can redistribute it and/or modify
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12 | * it under the terms of the GNU General Public License as published by
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13 | * the Free Software Foundation; either version 2 of the License, or
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14 | * (at your option) any later version.
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15 | *
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16 | * This program is distributed in the hope that it will be useful,
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17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 | * GNU General Public License for more details.
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20 | *
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21 | * You should have received a copy of the GNU General Public License
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22 | * along with this program; if not, write to the Free Software
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23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 | *############################################################################
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25 | */
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26 |
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27 | package org.greenstone.gatherer.util;
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28 |
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29 |
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30 | import java.awt.*;
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31 | import java.io.*;
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32 | import java.net.*;
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33 | import javax.swing.*;
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34 | import org.greenstone.gatherer.DebugStream;
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35 |
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36 |
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37 | public class JarTools
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38 | {
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39 | static private Class root_class = null;
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40 | static private ImageIcon ERROR_ICON = null;
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41 |
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42 |
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43 | static public void initialise(Object root_object)
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44 | {
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45 | root_class = root_object.getClass();
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46 | ERROR_ICON = getImage("error.gif");
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47 | }
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48 |
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49 |
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50 | static public void extractFromJar(String filename, String dst_dir, boolean must_be_present)
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51 | {
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52 | try {
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53 | // setup input stream for slurping out file
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54 | InputStream fis = root_class.getResourceAsStream("/"+filename);
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55 | BufferedInputStream fbis = new BufferedInputStream(fis);
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56 | DataInputStream fdbis = new DataInputStream(fbis);
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57 |
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58 | // set up output stream for writing to disk
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59 | String ofname = dst_dir + filename;
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60 | FileOutputStream fos = new FileOutputStream(ofname);
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61 | BufferedOutputStream bfos = new BufferedOutputStream(fos);
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62 |
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63 | byte[] buf = new byte[1024];
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64 | int len;
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65 | int total_bytes = 0;
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66 | while ((len = fdbis.read(buf)) >= 0) {
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67 | bfos.write(buf,0,len);
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68 | total_bytes += len;
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69 | }
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70 |
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71 | fdbis.close();
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72 | bfos.close();
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73 | }
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74 | catch (Exception exception) {
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75 | if (must_be_present) {
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76 | exception.printStackTrace();
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77 | }
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78 | }
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79 | }
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80 |
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81 |
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82 | /** Method to retrieve an image icon with the given filename found in classpath or the resouces directory.
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83 | * @return The specified <strong>ImageIcon</strong>, or an error image replacement if no such images exists.
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84 | */
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85 | static public ImageIcon getImage(String filename) {
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86 | return getImage(filename, false);
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87 | }
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88 |
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89 | static public ImageIcon getImage(String filename, boolean wait_until_complete)
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90 | {
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91 | ImageIcon image = null;
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92 | try {
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93 | image = new ImageIcon(root_class.getResource("/images/" + filename));
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94 | }
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95 | catch (NullPointerException exception) {
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96 | System.err.println("Error: Could not load image " + filename);
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97 | DebugStream.println("Error: Could not load image " + filename);
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98 | }
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99 |
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100 | if (image == null) {
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101 | image = ERROR_ICON;
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102 | }
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103 |
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104 | if (wait_until_complete) {
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105 | int load_status;
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106 | do {
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107 | load_status = image.getImageLoadStatus();
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108 | }
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109 | while (load_status != MediaTracker.ABORTED && load_status != MediaTracker.ERRORED && load_status != MediaTracker.COMPLETE);
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110 | }
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111 |
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112 | return image;
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113 | }
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114 |
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115 |
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116 | static public URL getResource(String resource_name)
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117 | {
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118 | return root_class.getResource(resource_name);
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119 | }
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120 |
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121 |
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122 | static public InputStream getResourceAsStream(String resource_name)
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123 | {
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124 | return root_class.getResourceAsStream(resource_name);
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125 | }
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126 |
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127 |
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128 | static public boolean isInJar(String filename)
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129 | {
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130 | try {
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131 | InputStream fis = root_class.getResourceAsStream("/" + filename);
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132 | fis.close();
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133 | }
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134 | catch (Exception exception) {
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135 | exception.printStackTrace();
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136 | return false;
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137 | }
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138 |
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139 | return true;
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140 | }
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141 | }
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