/*

 * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package java.awt.dnd;

import java.io.OutputStream;

import java.io.ObjectOutputStream;

import java.io.IOException;

import java.io.Serializable;

/**

 * Tests if an object can truly be serialized by serializing it to a null

 * OutputStream.

 *

 * @since 1.4

 */

final class SerializationTester {

    private static ObjectOutputStream stream;

    static {

        try {

            stream = new ObjectOutputStream(new OutputStream() {

                    public void write(int b) {}

                });

        } catch (IOException cannotHappen) {

        }

    }

    static boolean test(Object obj) {

        if (!(obj instanceof Serializable)) {

            return false;

        }

        try {

            stream.writeObject(obj);

        } catch (IOException e) {

            return false;

        } finally {

            // Fix for 4503661.

            // Reset the stream so that it doesn't keep a reference to the

            // written object.

            try {

                stream.reset();

            } catch (IOException e) {

                // Ignore the exception.

            }

        }

        return true;

    }

    private SerializationTester() {}

}