/*

 * Copyright (c) 2010, 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 sun.java2d.xr;

/**

 * Class provides unused XIDs, used for creating server-side objects

 * created by the java backend.

 * It does buffering, to minimize JNI overhead.

 *

 * @author Clemens Eisserer

 */

public class XIDGenerator {

    int[] xidBuffer = new int[XID_BUFFER_SIZE];

    int currentIndex = XID_BUFFER_SIZE;

    public int getNextXID() {

        if (currentIndex >= XID_BUFFER_SIZE) {

            bufferXIDs(xidBuffer, xidBuffer.length);

            currentIndex = 0;

        }

        return xidBuffer[currentIndex++];

    }

    private static native void bufferXIDs(int[] buffer, int arraySize);

}