abstractrule.java

虽然商业的规则引擎和BPM系统有许多优点

package util;

/** TODO 3
 * Created by IntelliJ IDEA.
 * User: gexian
 *在其execute()方法中，AbstractAction调用由子类实现的makeDecision()方法，
 * 然后根据方法的返回值，调用组件定义的肯定或否定结果的方法。
 */
public abstract class AbstractRule extends AbstractComponent {
    private AbstractComponent positiveOutcomeStep;
    private AbstractComponent negativeOutcomeStep;


    public void execute(Object arg) throws Exception {
       boolean outcome = makeDecision(arg);
        if(outcome)
        positiveOutcomeStep.execute(arg);
        else
        negativeOutcomeStep.execute(arg);
   }


    protected abstract boolean makeDecision(Object arg) throws Exception;


    public AbstractComponent getPositiveOutcomeStep() {
         return positiveOutcomeStep;
     }
    public void setPositiveOutcomeStep(AbstractComponent positiveOutcomeStep) {
         this.positiveOutcomeStep = positiveOutcomeStep;
     }

    public AbstractComponent getNegativeOutcomeStep() {
         return negativeOutcomeStep;
     }
    public void setNegativeOutcomeStep(AbstractComponent negativeOutcomeStep) {
         this.negativeOutcomeStep = negativeOutcomeStep;
     }


}