content: /*
   * Copyright (c) 2017, Andreas Fagschlunger. 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.
   *
   * 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 THE COPYRIGHT OWNER OR
   * CONTRIBUTORS 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 at.o2xfs.xfs.util;
  
  import at.o2xfs.log.Logger;
  import at.o2xfs.log.LoggerFactory;
  import at.o2xfs.win32.Buffer;
  import at.o2xfs.win32.HWND;
  import at.o2xfs.win32.Pointer;
  import at.o2xfs.win32.Type;
  import at.o2xfs.xfs.WFSResult;
  import at.o2xfs.xfs.XfsMessage;
  
  /**
   * @author Andreas Fagschlunger
   */
  public final class MessageHandler {
  
  	private final static Logger LOG = LoggerFactory.getLogger(MessageHandler.class);
  
  	private static native void init();
  
  	static {
  		init();
  	}
  
  	private Thread thread = null;
  
  	private final IXfsCallback xfsCallback;
  
  	private HWND hWnd = null;
  
  	private boolean windowCreated = false;
  
  	public MessageHandler(final IXfsCallback xfsCallback) {
  		if (xfsCallback == null) {
  			throw new IllegalArgumentException("xfsCallback must not be null");
  		}
  		hWnd = new HWND();
  		this.xfsCallback = xfsCallback;
  	}
  
  	public void start() {
  		final String method = "start()";
  		synchronized (this) {
  			if (thread != null && thread.isAlive()) {
  				throw new IllegalStateException("Already started");
  			}
  			thread = new Thread(new Runnable() {
  
  				@Override
  				public void run() {
  					runMessageLoop();
  				}
  			}, getClass().getSimpleName());
  			thread.start();
  			try {
  				while (!windowCreated) {
  					wait();
  				}
  			} catch (final InterruptedException e) {
  				if (LOG.isErrorEnabled()) {
  					LOG.error(method, "Interrupted", e);
  				}
  			}
  		}
  	}
  
  	private void runMessageLoop() {
  		run0(hWnd);
  	}
  
  	private native void run0(Type hWnd);
  
  	private void hWnd() {
  		synchronized (this) {
  			final String method = "hWnd()";
  			if (LOG.isDebugEnabled()) {
  				LOG.debug(method, "hWnd=" + hWnd);
  			}
  			windowCreated = true;
  			notifyAll();
  		}
  	}
  
  	private void callback(final int msg, final Buffer lpWFSResult) {
  		final String method = "callback(int, Buffer)";
  		if (LOG.isDebugEnabled()) {
  			LOG.debug(method, "msg=" + msg + ",lpWFSResult=" + lpWFSResult);
  		}
  		final XfsMessage xfsMessage = XfsConstants.valueOf(msg, XfsMessage.class);
  		if (xfsMessage == null) {
  			if (LOG.isWarnEnabled()) {
  				LOG.warn(method, "Unknown message: " + msg);
  			}
  			return;
  		}
  		final WFSResult wfsResult = new WFSResult(new Pointer(lpWFSResult));
  		xfsCallback.callback(xfsMessage, wfsResult);
  	}
  
  	public void close() {
  		final String method = "close()";
  		if (LOG.isDebugEnabled()) {
  			LOG.debug(method, "hWnd=" + hWnd);
  		}
  		if (hWnd != null) {
  			close0(hWnd);
  		}
  		synchronized (this) {
  			if (thread != null && thread.isAlive()) {
  				try {
  					thread.join(1000L);
  				} catch (InterruptedException e) {
  					throw new RuntimeException(e);
  				}
  			}
  		}
  	}
  
  	private native void close0(Type hWnd);
  
  	/**
  	 * @return the hWnd
  	 */
  	public HWND getHWnd() {
  		return hWnd;
  	}
  }