1 /* XGraphicsDevice.java -- GraphicsDevice for X
2    Copyright (C) 2006 Free Software Foundation, Inc.
3 
4 This file is part of GNU Classpath.
5 
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10 
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 General Public License for more details.
15 
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING.  If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
20 
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library.  Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25 
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module.  An independent module is a module which is not derived from
33 or based on this library.  If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so.  If you do not wish to do so, delete this
36 exception statement from your version. */
37 
38 package gnu.java.awt.peer.x;
39 
40 import gnu.classpath.SystemProperties;
41 import gnu.x11.Display;
42 import gnu.x11.EscherServerConnectionException;
43 
44 import java.awt.GraphicsConfiguration;
45 import java.awt.GraphicsDevice;
46 import java.lang.reflect.Constructor;
47 import java.net.Socket;
48 
49 /**
50  * This class represents an X Display. The actual connection is established
51  * lazily when it is first needed.
52  *
53  * @author Roman Kennke (kennke@aicas.com)
54  */
55 public class XGraphicsDevice
56   extends GraphicsDevice
57 {
58 
59   private XGraphicsConfiguration defaultConfiguration;
60 
61   /**
62    * The X display associated with the XGraphicsDevice. This is established
63    * when {@link #getDisplay} is first called.
64    */
65   private Display display;
66 
67   /**
68    * The display name from which the display will be initialized.
69    */
70   private Display.Name displayName;
71 
72   /**
73    * The event pump for this X Display.
74    */
75   private XEventPump eventPump;
76 
77   /**
78    * Creates a new XGraphicsDevice.
79    */
XGraphicsDevice(Display.Name dn)80   XGraphicsDevice(Display.Name dn)
81   {
82     displayName = dn;
83   }
84 
getType()85   public int getType()
86   {
87     return TYPE_RASTER_SCREEN;
88   }
89 
getIDstring()90   public String getIDstring()
91   {
92     // TODO: Implement this.
93     throw new UnsupportedOperationException("Not yet implemented.");
94   }
95 
getConfigurations()96   public GraphicsConfiguration[] getConfigurations()
97   {
98     // TODO: Implement this.
99     throw new UnsupportedOperationException("Not yet implemented.");
100   }
101 
getDefaultConfiguration()102   public GraphicsConfiguration getDefaultConfiguration()
103   {
104     if (defaultConfiguration == null)
105       defaultConfiguration = new XGraphicsConfiguration(this);
106     return defaultConfiguration;
107   }
108 
109   /**
110    * Returns the X Display associated with this XGraphicsDevice.
111    * This establishes the connection to the X server on the first invocation.
112    *
113    * @return the X Display associated with this XGraphicsDevice
114    */
getDisplay()115   Display getDisplay()
116   {
117     if (display == null)
118       {
119         if (displayName.hostname.equals(""))
120           displayName.hostname = "localhost";
121         if (XToolkit.DEBUG)
122           System.err.println("connecting to : " + displayName);
123         // Try to connect via unix domain sockets when host == localhost.
124         if ((displayName.hostname.equals("localhost")
125              || displayName.hostname.equals(""))
126           && SystemProperties.getProperty("gnu.xawt.no_local_sockets") == null)
127           {
128             Socket socket = createLocalSocket();
129             if (socket != null)
130               {
131                 try
132                   {
133                     display = new Display(socket, "localhost",
134                                           displayName.display_no,
135                                           displayName.screen_no);
136                   }
137                 catch (EscherServerConnectionException e)
138                   {
139                     throw new RuntimeException(e.getCause());
140                   }
141               }
142           }
143 
144         // The following happens when we are configured to use plain sockets,
145         // when the connection is probably remote or when we couldn't load
146         // the LocalSocket class stuff.
147         if (display == null)
148           {
149             try
150               {
151                 display = new Display(displayName);
152               }
153             catch (EscherServerConnectionException e)
154               {
155                 throw new RuntimeException(e.getCause());
156               }
157           }
158 
159         eventPump = new XEventPump(display);
160       }
161     return display;
162   }
163 
getEventPump()164   XEventPump getEventPump()
165   {
166     return eventPump;
167   }
168 
169   /**
170    * Tries to load the LocalSocket class and initiate a connection to the
171    * local X server.
172    */
createLocalSocket()173   private Socket createLocalSocket()
174   {
175     Socket socket = null;
176     try
177       {
178         // TODO: Is this 100% ok?
179         String sockPath = "/tmp/.X11-unix/X" + displayName.display_no;
180         Class localSocketAddressClass =
181           Class.forName("gnu.java.net.local.LocalSocketAddress");
182         Constructor localSocketAddressConstr =
183           localSocketAddressClass.getConstructor(new Class[]{ String.class });
184         Object addr =
185           localSocketAddressConstr.newInstance(new Object[]{ sockPath });
186         Class localSocketClass =
187           Class.forName("gnu.java.net.local.LocalSocket");
188         Constructor localSocketConstructor =
189           localSocketClass.getConstructor(new Class[]{localSocketAddressClass});
190         Object localSocket =
191           localSocketConstructor.newInstance(new Object[]{ addr });
192         socket = (Socket) localSocket;
193       }
194     catch (Exception ex)
195       {
196         // Whatever goes wrong here, we return null.
197       }
198     return socket;
199   }
200 }
201