/*
 * Copyright (c) 2014, grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.spi.impl.swt.common.clipboard;

import org.eclipse.swt.dnd.ByteArrayTransfer;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.TransferData;
import org.jowidgets.spi.clipboard.TransferContainer;
import org.jowidgets.spi.impl.clipboard.Serializer;

public final class ObjectTransfer extends ByteArrayTransfer {

    private static final String MIME_TYPE = TransferContainer.MIME_TYPE;
    private static final int MIME_TYPE_ID = registerType(MIME_TYPE);

    private static final ObjectTransfer INSTANCE = new ObjectTransfer();

    public static ObjectTransfer getInstance() {
        return INSTANCE;
    }

    @Override
    protected int[] getTypeIds() {
        return new int[] {MIME_TYPE_ID};
    }

    @Override
    protected String[] getTypeNames() {
        return new String[] {MIME_TYPE};
    }

    @Override
    public void javaToNative(final Object object, final TransferData transferData) {
        if (!validate(object) || !isSupportedType(transferData)) {
            DND.error(DND.ERROR_INVALID_DATA);
        }
        super.javaToNative(Serializer.serialize(object), transferData);
    }

    @Override
    public Object nativeToJava(final TransferData transferData) {
        if (!isSupportedType(transferData)) {
            return null;
        }
        final byte[] bytes = (byte[]) super.nativeToJava(transferData);
        return bytes == null ? null : Serializer.deserialize(bytes);
    }

    @Override
    protected boolean validate(final Object object) {
        if (object == null) {
            return false;
        }
        else {
            return true;
        }
    }

}