Android Open Source - droidoflife Life Runtime

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License

The source code is released under:

GNU General Public License

Java Source Code

/******************************************************************************
 *  Droid of Life, an open source Android game based on Conway's Game of Life *
 *  Copyright (C) 2012  Christian Ulrich <chrulri@gmail.com>                  *
 *                                                                            *
 *  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 3 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, see <http://www.gnu.org/licenses/>.     *
 ******************************************************************************/
package com.chrulri.droidoflife;
//ww  w .j  av  a 2s .c  o  m
import android.graphics.Bitmap;


/**
 * Droid of Life - Native Worker Class
 */
final class LifeRuntime {
  static final String TAG = LifeRuntime.class.getSimpleName();

  /* ************************************************************************************************************* */
  
  static final int OK = 0;
  static final int E_INVALID_SIZE = 1;

  static final int SETTINGS_SHOW_DEATHBIRTH = 0;

  static {
    System.loadLibrary("dol");
  }

  private static native int nRuntimeCreate(int width, int height);

  private static native void nRuntimeIterate();
  
  private static native void nRuntimeDestroy();
  
  private static native void nRuntimeBitmap(Bitmap bmp, int settings);

  /* ************************************************************************************************************* */

  private static LifeRuntime runtime = null;

  private int iteration;

  private LifeRuntime() {
    iteration = 0;
  }

  public static int getIteration() {
    if(runtime == null)
      return 0;
    return runtime.iteration;
  }
  
  /**
   * creates runtime
   * 
   * @param width count of cells per row
   * @param height count of rows of cells
   * @throws LifeRuntimeException 
   */
  public static void create(int width, int height) throws LifeRuntimeException {
    runtime = new LifeRuntime();
    int ret = nRuntimeCreate(width, height);
    if (ret != OK) {
      throw new LifeRuntimeException("failed to initialize the droid of life runtime", "_init", ret);
    }
  }

  /**
   * iterate through one generation of life
   * 
   * @return number of generation
   * @throws IllegalAccessException if runtime is not initialized yet
   */
  public static int iterate() throws IllegalAccessException {
    checkRuntime();
    nRuntimeIterate();
    return ++runtime.iteration;
  }

  /**
   * tell native runtime to render the scene
   */
  public static void render(Bitmap bmp, int settings) {
    nRuntimeBitmap(bmp, settings);
  }

  /**
   * destroy that beautiful place of life
   */
  public static void destroy() {
    nRuntimeDestroy();
    runtime = null;
  }

  /**
   * @throws IllegalAccessException if runtime is not initialized yet
   */
  private static void checkRuntime() throws IllegalAccessException {
    if (runtime == null) {
      throw new IllegalAccessException("runtime is not initialized yet");
    }
  }

  /* ************************************************************************************************************* */

  public static class LifeRuntimeException extends Exception {
    private static final long serialVersionUID = 1L;

    public LifeRuntimeException(String detailMessage, String nativeMethodName, int nativeReturnValue) {
      super(detailMessage, new NativeException(nativeMethodName, nativeReturnValue));
    }
  }

  public static class NativeException extends Exception {
    private static final long serialVersionUID = 1L;

    public NativeException(String methodName, int returnValue) {
      super("method " + methodName + " returns " + returnValue);
    }
  }
}

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