package org.kuali.rice.krms.framework.engine;
   
   import java.util.List;
   
   import org.kuali.rice.krms.api.engine.ExecutionEnvironment;
   import org.kuali.rice.krms.api.engine.ResultEvent;
   import org.kuali.rice.krms.framework.engine.result.BasicResult;
   
   public class BasicRule implements Rule {
  	private static final ResultLogger LOG = ResultLogger.getInstance();
  
  	private String name;
  	private Proposition proposition;
  	private List<Action> actions;
  	
  	public BasicRule(String name, Proposition proposition, List<Action> actions) {
  		if (proposition == null) {
  			throw new IllegalArgumentException("Propsition cannot be null.");
  		}
  		this.name = name;
  		this.proposition = proposition;
  		this.actions = actions;
  	}
  	
  	public BasicRule(Proposition proposition, List<Action> actions) {
  		this(null, proposition, actions);
  	}
  	
  	@Override
  	public boolean evaluate(ExecutionEnvironment environment) {
  		boolean result = proposition.evaluate(environment).getResult();
  		if (actions != null) {
  			for (Action action : actions) {
  				if (shouldExecuteAction(result)) {
  					action.execute(environment);
  				}
  			}
  		}
  		if (LOG.isEnabled(environment)){
  			LOG.logResult(new BasicResult(ResultEvent.RuleEvaluated, this, environment, result));
  		}
  		return result;
  	}
  	
  	protected boolean shouldExecuteAction(boolean ruleExecutionResult) {
  		return ruleExecutionResult;
  	}
  
  	public String getName() {
  		return name;
  	}
  	
  	public String toString(){
  		return name;
  	}
  }