package cn.ksource.core.component;

import java.util.List;

import org.apache.commons.lang.StringUtils;

import freemarker.template.TemplateMethodModel;
import freemarker.template.TemplateModelException;

/**
 * K_IfEmpty(p1,p2,p3) if p1==true return p2 else return p3
 */
public class K_IFEmpty implements TemplateMethodModel{

	@Override
	public Object exec(List list) throws TemplateModelException {
		if (list.size() != 3) {
			throw new RuntimeException("IfEmpty组件，需要三个参数");
		}
		
		Object p1 = list.get(0);
		if (p1 == null || StringUtils.isBlank(p1.toString())) {
			return list.get(1);
		} else {
			return list.get(2);
		}
	}

}