AroundRuleEngine.java

package com.easyooo.framework.rule.impl;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.easyooo.framework.rule.Rule;
import com.easyooo.framework.rule.RuleContext;
import com.easyooo.framework.rule.RuleEngine;
import com.easyooo.framework.rule.RuleException;

/**
 * @author Killer
 */
public class AroundRuleEngine implements RuleEngine {
	protected final Logger logger = LoggerFactory.getLogger(getClass());
	private RuleEngine delegate;
	
	public AroundRuleEngine(RuleEngine delegate){
		this.delegate = delegate;
	}
	
	@Override
	public <T> T eval(Rule rule) throws RuleException {
		return delegate.eval(rule, new Object[]{}); 
	}

	@Override
	public <T> T eval(Rule rule, Object... dataMap) throws RuleException {
		check(rule);
		return delegate.eval(rule, dataMap); 
	}
	
	private boolean check(Rule rule)throws RuleException{
		if(rule == null || rule.getRuleText() == null || 
				"".equals(rule.getRuleText())){
			throw new RuleException("The rules can't be empty");
		}
		return true;
	}

	@Override
	public void setContext(RuleContext context) {
		delegate.setContext(context);
	}

	@Override
	public boolean verifySyntax(Rule rule) throws RuleException {
		return delegate.verifySyntax(rule);
	}
	
}