src/share/classes/java/awt/GraphicsEnvironment.java

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   1 /*
   2  * Copyright (c) 1997, 2013, 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


  78      */
  79     public static synchronized GraphicsEnvironment getLocalGraphicsEnvironment() {
  80         if (localEnv == null) {
  81             localEnv = createGE();
  82         }
  83 
  84         return localEnv;
  85     }
  86 
  87     /**
  88      * Creates and returns the GraphicsEnvironment, according to the
  89      * system property 'java.awt.graphicsenv'.
  90      *
  91      * @return the graphics environment
  92      */
  93     private static GraphicsEnvironment createGE() {
  94         GraphicsEnvironment ge;
  95         String nm = AccessController.doPrivileged(new GetPropertyAction("java.awt.graphicsenv", null));
  96         try {
  97 //          long t0 = System.currentTimeMillis();
  98             Class<GraphicsEnvironment> geCls;
  99             try {
 100                 // First we try if the bootclassloader finds the requested
 101                 // class. This way we can avoid to run in a privileged block.
 102                 geCls = (Class<GraphicsEnvironment>)Class.forName(nm);
 103             } catch (ClassNotFoundException ex) {
 104                 // If the bootclassloader fails, we try again with the
 105                 // application classloader.
 106                 ClassLoader cl = ClassLoader.getSystemClassLoader();
 107                 geCls = (Class<GraphicsEnvironment>)Class.forName(nm, true, cl);
 108             }
 109             ge = geCls.newInstance();
 110 //          long t1 = System.currentTimeMillis();
 111 //          System.out.println("GE creation took " + (t1-t0)+ "ms.");
 112             if (isHeadless()) {
 113                 ge = new HeadlessGraphicsEnvironment(ge);
 114             }
 115         } catch (ClassNotFoundException e) {
 116             throw new Error("Could not find class: "+nm);
 117         } catch (InstantiationException e) {
 118             throw new Error("Could not instantiate Graphics Environment: "
 119                             + nm);
 120         } catch (IllegalAccessException e) {
 121             throw new Error ("Could not access Graphics Environment: "
 122                              + nm);
 123         }
 124         return ge;
 125     }
 126 
 127     /**
 128      * Tests whether or not a display, keyboard, and mouse can be
 129      * supported in this environment.  If this method returns true,


   1 /*
   2  * Copyright (c) 1997, 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


  78      */
  79     public static synchronized GraphicsEnvironment getLocalGraphicsEnvironment() {
  80         if (localEnv == null) {
  81             localEnv = createGE();
  82         }
  83 
  84         return localEnv;
  85     }
  86 
  87     /**
  88      * Creates and returns the GraphicsEnvironment, according to the
  89      * system property 'java.awt.graphicsenv'.
  90      *
  91      * @return the graphics environment
  92      */
  93     private static GraphicsEnvironment createGE() {
  94         GraphicsEnvironment ge;
  95         String nm = AccessController.doPrivileged(new GetPropertyAction("java.awt.graphicsenv", null));
  96         try {
  97 //          long t0 = System.currentTimeMillis();
  98             Class<?> geCls;
  99             try {
 100                 // First we try if the bootclassloader finds the requested
 101                 // class. This way we can avoid to run in a privileged block.
 102                 geCls = Class.forName(nm);
 103             } catch (ClassNotFoundException ex) {
 104                 // If the bootclassloader fails, we try again with the
 105                 // application classloader.
 106                 ClassLoader cl = ClassLoader.getSystemClassLoader();
 107                 geCls = Class.forName(nm, true, cl);
 108             }
 109             ge = GraphicsEnvironment.class.cast(geCls.newInstance());
 110 //          long t1 = System.currentTimeMillis();
 111 //          System.out.println("GE creation took " + (t1-t0)+ "ms.");
 112             if (isHeadless()) {
 113                 ge = new HeadlessGraphicsEnvironment(ge);
 114             }
 115         } catch (ClassNotFoundException e) {
 116             throw new Error("Could not find class: "+nm);
 117         } catch (InstantiationException e) {
 118             throw new Error("Could not instantiate Graphics Environment: "
 119                             + nm);
 120         } catch (IllegalAccessException e) {
 121             throw new Error ("Could not access Graphics Environment: "
 122                              + nm);
 123         }
 124         return ge;
 125     }
 126 
 127     /**
 128      * Tests whether or not a display, keyboard, and mouse can be
 129      * supported in this environment.  If this method returns true,