/*
* Copyright (c) 2009 Levente Farkas
* Copyright (c) 2008 Wayne Meissner
*
* 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 <http://www.gnu.org/licenses/>.
*/
package org.gstreamer.interfaces;
import java.util.ArrayList;
import java.util.List;
import org.gstreamer.Element;
import org.gstreamer.GObject;
import org.gstreamer.lowlevel.GType;
import org.gstreamer.lowlevel.NativeValue;
import org.gstreamer.lowlevel.GlibAPI.GList;
import com.sun.jna.Pointer;
import static org.gstreamer.lowlevel.GstInterfacesAPI.GSTINTERFACES_API;
/**
* Base type for all gstreamer interface proxies
*/
public class GstInterface extends NativeValue {
protected final Pointer handle;
protected final Element element;
protected GstInterface(Element element, GType type) {
if (!GSTINTERFACES_API.gst_element_implements_interface(element, type)) {
throw new IllegalArgumentException("Element does not implement interface");
}
this.element = element;
handle = GSTINTERFACES_API.gst_implements_interface_cast(element, type);
}
protected Object nativeValue() {
return handle;
}
public Element getElement() {
return element;
}
protected interface ListElementCreator<E> {
E create(Pointer pointer);
}
/**
* Build a {@link java.util.List} of {@link Object} from the native GList.
* @param glist The native list to get the objects from.
* @param creator The proxy class to wrap the list elements in.
* @return The converted list.
*/
protected <T extends GObject> List<T> objectList(GList glist, ListElementCreator<T> creator) {
List<T> list = new ArrayList<T>();
GList next = glist;
while (next != null) {
if (next.data != null) {
list.add(creator.create(next.data));
}
next = next.next();
}
return list;
}
}