org.freedesktop.gstreamer.lowlevel.GObjectPtr Maven / Gradle / Ivy

/*
 * Copyright (c) 2019 Neil C Smith
 * 
 * This file is part of gstreamer-java.
 *
 * This code is free software: you can redistribute it and/or modify it under the terms of the GNU
 * Lesser General Public License version 3 only, as published by the Free Software Foundation.
 *
 * 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
 * Lesser General Public License version 3 for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License version 3 along with
 * this work. If not, see .
 */
package org.freedesktop.gstreamer.lowlevel;

import com.sun.jna.Native;
import com.sun.jna.Pointer;

/**
 * Base GObject pointer
 */
public class GObjectPtr extends GTypedPtr {

    public GObjectPtr() {
    }

    public GObjectPtr(Pointer ptr) {
        super(ptr);
    }

    @Override
    public GType getGType() {
        // Quick getter for GType without allocation
        // same as : new GObjectStruct(ptr).g_type_instance.g_class.g_type
        Pointer g_class = getPointer().getPointer(0);
        if (Native.SIZE_T_SIZE == 8) {
            return GType.valueOf(g_class.getLong(0));
        } else if (Native.SIZE_T_SIZE == 4) {
            return GType.valueOf(((long) g_class.getInt(0)) & 0xffffffffL);
        } else {
            throw new IllegalStateException("SIZE_T size not supported: " + Native.SIZE_T_SIZE);
        }
    }

}