Home » openjdk-7 » java » awt » dnd » [javadoc | source]

    1   /*
    2    * Copyright (c) 2001, 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 java.awt.dnd;
   27   
   28   import java.io.OutputStream;
   29   import java.io.ObjectOutputStream;
   30   import java.io.IOException;
   31   import java.io.Serializable;
   32   
   33   /**
   34    * Tests if an object can truly be serialized by serializing it to a null
   35    * OutputStream.
   36    *
   37    * @since 1.4
   38    */
   39   final class SerializationTester {
   40       private static ObjectOutputStream stream;
   41       static {
   42           try {
   43               stream = new ObjectOutputStream(new OutputStream() {
   44                       public void write(int b) {}
   45                   });
   46           } catch (IOException cannotHappen) {
   47           }
   48       }
   49   
   50       static boolean test(Object obj) {
   51           if (!(obj instanceof Serializable)) {
   52               return false;
   53           }
   54   
   55           try {
   56               stream.writeObject(obj);
   57           } catch (IOException e) {
   58               return false;
   59           } finally {
   60               // Fix for 4503661.
   61               // Reset the stream so that it doesn't keep a reference to the
   62               // written object.
   63               try {
   64                   stream.reset();
   65               } catch (IOException e) {
   66                   // Ignore the exception.
   67               }
   68           }
   69           return true;
   70       }
   71   
   72       private SerializationTester() {}
   73   }

Home » openjdk-7 » java » awt » dnd » [javadoc | source]