1 /* |
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2 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.servicetag; |
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27 |
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28 import java.lang.reflect.Field; |
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29 import java.lang.reflect.Method; |
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30 import java.lang.reflect.InvocationTargetException; |
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31 import java.io.IOException; |
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32 import java.net.URI; |
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33 |
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34 /** |
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35 * BrowserSupport class. |
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36 * |
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37 * The implementation of the com.sun.servicetag API needs to be |
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38 * compiled with JDK 5 as well since the consumer of this API |
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39 * may require to support JDK 5 (e.g. NetBeans). |
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40 * |
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41 * The Desktop.browse() method can be backported in this class |
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42 * if needed. The current implementation only supports JDK 6. |
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43 */ |
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44 class BrowserSupport { |
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45 private static boolean isBrowseSupported = false; |
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46 private static Method browseMethod = null; |
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47 private static Object desktop = null; |
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48 private static volatile Boolean result = false; |
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49 |
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50 |
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51 private static void initX() { |
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52 if (desktop != null) { |
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53 return; |
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54 } |
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55 boolean supported = false; |
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56 Method browseM = null; |
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57 Object desktopObj = null; |
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58 try { |
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59 // Determine if java.awt.Desktop is supported |
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60 Class<?> desktopCls = Class.forName("java.awt.Desktop", true, null); |
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61 Method getDesktopM = desktopCls.getMethod("getDesktop"); |
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62 browseM = desktopCls.getMethod("browse", URI.class); |
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63 |
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64 Class<?> actionCls = Class.forName("java.awt.Desktop$Action", true, null); |
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65 final Method isDesktopSupportedMethod = desktopCls.getMethod("isDesktopSupported"); |
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66 Method isSupportedMethod = desktopCls.getMethod("isSupported", actionCls); |
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67 Field browseField = actionCls.getField("BROWSE"); |
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68 // isDesktopSupported calls getDefaultToolkit which can block |
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69 // infinitely, see 6636099 for details, to workaround we call |
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70 // in a thread and time it out, noting that the issue is specific |
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71 // to X11, it does not hurt for Windows. |
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72 Thread xthread = new Thread() { |
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73 public void run() { |
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74 try { |
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75 // support only if Desktop.isDesktopSupported() and |
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76 // Desktop.isSupported(Desktop.Action.BROWSE) return true. |
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77 result = (Boolean) isDesktopSupportedMethod.invoke(null); |
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78 } catch (IllegalAccessException e) { |
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79 // should never reach here |
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80 throw new InternalError("Desktop.getDesktop() method not found", e); |
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81 } catch (InvocationTargetException e) { |
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82 // browser not supported |
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83 if (Util.isVerbose()) { |
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84 e.printStackTrace(); |
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85 } |
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86 } |
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87 } |
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88 }; |
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89 // set it to daemon, so that the vm will exit. |
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90 xthread.setDaemon(true); |
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91 xthread.start(); |
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92 try { |
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93 xthread.join(5 * 1000); |
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94 } catch (InterruptedException ie) { |
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95 // ignore the exception |
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96 } |
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97 if (result.booleanValue()) { |
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98 desktopObj = getDesktopM.invoke(null); |
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99 result = (Boolean) isSupportedMethod.invoke(desktopObj, browseField.get(null)); |
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100 supported = result.booleanValue(); |
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101 } |
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102 } catch (IllegalAccessException e) { |
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103 // should never reach here |
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104 throw new InternalError("Desktop.getDesktop() method not found", e); |
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105 } catch (ReflectiveOperationException e) { |
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106 // browser not supported |
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107 if (Util.isVerbose()) { |
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108 e.printStackTrace(); |
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109 } |
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110 } |
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111 isBrowseSupported = supported; |
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112 browseMethod = browseM; |
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113 desktop = desktopObj; |
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114 } |
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115 |
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116 static boolean isSupported() { |
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117 initX(); |
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118 return isBrowseSupported; |
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119 } |
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120 |
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121 /** |
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122 * Launches the default browser to display a {@code URI}. |
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123 * If the default browser is not able to handle the specified |
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124 * {@code URI}, the application registered for handling |
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125 * {@code URIs} of the specified type is invoked. The application |
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126 * is determined from the protocol and path of the {@code URI}, as |
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127 * defined by the {@code URI} class. |
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128 * <p> |
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129 * This method calls the Desktop.getDesktop().browse() method. |
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130 * <p> |
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131 * @param uri the URI to be displayed in the user default browser |
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132 * |
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133 * @throws NullPointerException if {@code uri} is {@code null} |
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134 * @throws UnsupportedOperationException if the current platform |
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135 * does not support the {@link Desktop.Action#BROWSE} action |
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136 * @throws IOException if the user default browser is not found, |
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137 * or it fails to be launched, or the default handler application |
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138 * failed to be launched |
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139 * @throws IllegalArgumentException if the necessary permissions |
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140 * are not available and the URI can not be converted to a {@code URL} |
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141 */ |
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142 static void browse(URI uri) throws IOException { |
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143 if (uri == null) { |
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144 throw new NullPointerException("null uri"); |
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145 } |
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146 if (!isSupported()) { |
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147 throw new UnsupportedOperationException("Browse operation is not supported"); |
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148 } |
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149 |
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150 // Call Desktop.browse() method |
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151 try { |
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152 if (Util.isVerbose()) { |
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153 System.out.println("desktop: " + desktop + ":browsing..." + uri); |
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154 } |
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155 browseMethod.invoke(desktop, uri); |
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156 } catch (IllegalAccessException e) { |
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157 // should never reach here |
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158 throw new InternalError("Desktop.getDesktop() method not found", e); |
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159 } catch (InvocationTargetException e) { |
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160 Throwable x = e.getCause(); |
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161 if (x != null) { |
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162 if (x instanceof UnsupportedOperationException) { |
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163 throw (UnsupportedOperationException) x; |
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164 } else if (x instanceof IllegalArgumentException) { |
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165 throw (IllegalArgumentException) x; |
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166 } else if (x instanceof IOException) { |
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167 throw (IOException) x; |
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168 } else if (x instanceof SecurityException) { |
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169 throw (SecurityException) x; |
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170 } else { |
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171 // ignore |
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172 } |
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173 } |
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174 } |
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175 } |
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176 } |
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