/*******************************************************************************
 * Breakout Cave Survey Visualizer
 *
 * Copyright (C) 2014 James Edwards
 *
 * jedwards8 at fastmail dot fm
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program 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 for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *******************************************************************************/
package org.andork.jogl;

import com.jogamp.opengl.GL2ES2;

public abstract class JoglManagedResource implements JoglResource {
	private final JoglResourceManager manager;
	private int useCount;
	private boolean initialized;

	public JoglManagedResource(JoglResourceManager manager) {
		this.manager = manager;
	}

	public final void addUser(Object user) {
		if (useCount++ == 0) {
			doUse();
			manager.initLater(this);
		}
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.andork.jogl.neu.JoglResource#dispose(com.jogamp.opengl.GL2ES2)
	 */
	@Override
	public final void dispose(GL2ES2 gl) {
		requireInitialized();
		initialized = false;
		doDispose(gl);
	}

	protected abstract void doDispose(GL2ES2 gl);

	protected abstract void doInit(GL2ES2 gl);

	protected void doRelease() {

	}

	protected void doUse() {

	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.andork.jogl.neu.JoglResource#init(com.jogamp.opengl.GL2ES2)
	 */
	@Override
	public final void init(GL2ES2 gl) {
		requireUninitialized();
		initialized = true;
		doInit(gl);
	}

	public final boolean isInitialized() {
		return initialized;
	}

	public final boolean isInUse() {
		return useCount > 0;
	}

	public final void removeUser(Object user) {
		if (useCount > 0 && --useCount == 0) {
			manager.disposeLater(this);
			doRelease();
		}
	}

	protected final void requireInitialized() {
		if (!initialized) {
			throw new IllegalArgumentException("not initialized");
		}
	}

	protected final void requireUninitialized() {
		if (initialized) {
			throw new IllegalArgumentException("already initialized");
		}
	}
}