1 /*
   2  * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.glass.ui.monocle;
  27 
  28 import java.security.AccessController;
  29 import java.security.PrivilegedAction;
  30 import java.util.Locale;
  31 
  32 public abstract class NativePlatformFactory {
  33 
  34     protected abstract boolean matches();
  35 
  36     protected abstract NativePlatform createNativePlatform();
  37 
  38     private static NativePlatform platform;
  39     public static synchronized NativePlatform getNativePlatform() {
  40         if (platform == null) {
  41             String platformFactoryProperty =
  42                     AccessController.doPrivileged((PrivilegedAction<String>) () -> System.getProperty("monocle.platform",
  43                                               "MX6,OMAP,Dispman,X11,Linux,Headless"));
  44             String[] platformFactories = platformFactoryProperty.split(",");
  45             for (int i = 0; i < platformFactories.length; i++) {
  46                 String factoryName = platformFactories[i].trim();
  47                 String factoryClassName;
  48                 if (factoryName.contains(".")) {
  49                     factoryClassName = factoryName;
  50                 } else {
  51                     factoryClassName = "com.sun.glass.ui.monocle."
  52                         + factoryName.toLowerCase(Locale.ROOT)
  53                         + "." + factoryName + "PlatformFactory";
  54                 }
  55                 if (MonocleSettings.settings.tracePlatformConfig) {
  56                     MonocleTrace.traceConfig("Trying platform %s with class %s",
  57                                              factoryName, factoryClassName);
  58                 }
  59                 try {
  60                     NativePlatformFactory npf = (NativePlatformFactory)
  61                             Class.forName(factoryClassName)
  62                             .newInstance();
  63                     if (npf.matches()) {
  64                         platform = npf.createNativePlatform();
  65                         if (MonocleSettings.settings.tracePlatformConfig) {
  66                             MonocleTrace.traceConfig("Matched %s", factoryName);
  67                         }
  68                         return platform;
  69                     }
  70                 } catch (Exception e) {
  71                     if (MonocleSettings.settings.tracePlatformConfig) {
  72                         MonocleTrace.traceConfig("Failed to create platform %s",
  73                                                  factoryClassName);
  74                     }
  75                     e.printStackTrace();
  76                 }
  77             }
  78             throw new UnsupportedOperationException(
  79                     "Cannot load a native platform from: '"
  80                     + platformFactoryProperty + "'");
  81         }
  82         return platform;
  83     }
  84 
  85 }