Android Open Source - Gamework Reference Reaction

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License

The source code is released under:

Apache License

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Java Source Code

package cz.robyer.gamework.scenario.reaction;
// www  . ja v  a  2  s  . c  om
import android.util.Log;

/**
 * Game reaction which only activate another reaction.
 * @author Robert P?sel
 */
public class ReferenceReaction extends Reaction {
  protected String value;
  protected Reaction reaction;
  
  /**
   * Class constructor.
   * @param id Identificator of this reaction.
   * @param value Identificator of reaction which should be activated.
   */
  public ReferenceReaction(String id, String value) {
    super(id);
    this.value = value;
  }
  
  /**
   * Checks if given Reaction can be cross referenced to this. It works also recursively for MultiReactions.
   * @param reaction MultiReaction to check cross reference.
   * @return Reaction which points to this reaction or null if there isn's any.
   */
  private Reaction checkCrossReference(Reaction reaction, int num) {
    if (num > 10) {
      Log.e(TAG, "There are too many nested reactions, most likely due to cross references.");
      return reaction;
    }
    
    if (reaction instanceof ReferenceReaction) {
      String value = ((ReferenceReaction)reaction).value;
      
      if (value.equalsIgnoreCase(id)) // ! this IF must be before the other one
        return reaction; // cross-reference with this reaction
      
      if (value.equalsIgnoreCase(reaction.getId()))
        return null; // self-reference of that reaction

      reaction = getScenario().getReaction(value);
      return checkCrossReference(reaction, num+1);
    } else if (reaction instanceof MultiReaction) {
      for (Reaction r : ((MultiReaction)reaction).getReactions()) {
        Reaction crossref = checkCrossReference(r, num+1);
        if (crossref != null)
          return crossref;
      }
    }
    return null;
  }
  
  /* (non-Javadoc)
   * @see cz.robyer.gamework.scenario.BaseObject#onScenarioLoaded()
   */
  @Override
  public boolean onScenarioLoaded() {
    reaction = getScenario().getReaction(value);
    if (reaction == null)
      Log.e(TAG, String.format("Reaction '%s' is null", value));
    
    // check cross references
    Reaction crossReaction = checkCrossReference(reaction, 0);
    if (crossReaction != null) {
      Log.e(TAG, "This reaction is cross-referenced with reaction id='" + crossReaction.getId() + "'");
      reaction = null;
    }
    
    return reaction != null;
  }

  /* (non-Javadoc)
   * @see cz.robyer.gamework.scenario.reaction.Reaction#action()
   */
  @Override
  public void action() {
    if (reaction == null) {
      Log.e(TAG, String.format("Reaction '%s' is null", value));
      return;
    }
    
    reaction.action();
  }

}

Java Source Code List