package cz.cuni.amis.utils.flag.connective;
   
   import java.util.Map;
   import java.util.WeakHashMap;
   
   import cz.cuni.amis.utils.flag.Flag;
   
   public class Or extends Connective {
   	
  	private static Map<Or, Or> ors = new WeakHashMap<Or, Or>();
  	
  	public static Or get(Flag<Boolean> flag1, Flag<Boolean> flag2) {
  		return get(new Flag[]{flag1, flag2});
  	}
  	
  	public static Or get(Flag<Boolean>[] flags) {
  		synchronized(ors) {
  			Or or = new Or(flags);
  			Or existingOr = ors.get(or);
  			if (existingOr != null) return existingOr;
  			ors.put(or, or);
  			return or;
  		}		
  	}
  
  	private Or(Flag<Boolean>[] states) {
  		super(states);
  	}
  
  	@Override
  	protected void truthValueChanged() {
  		synchronized(truthValue) {
  			setFlag(truthValue[0] > 0);
  		}
  		
  	}
  	
  }