package com.ryo.metadata.web.extend;

import freemarker.core.Environment;
import freemarker.template.TemplateDirectiveBody;
import freemarker.template.TemplateDirectiveModel;
import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.util.Map;

/**
 * @author houbinbin
 * @since 16/4/29
 */
@Component
public class BlockDirective implements TemplateDirectiveModel {
	public final static String DIRECTIVE_NAME = "block";
	
	@Override
	public void execute(Environment env,
						Map params, TemplateModel[] loopVars,
						TemplateDirectiveBody body) throws TemplateException, IOException {
		String name = DirectiveUtils.getRequiredParam(params, "name");
		TemplateDirectiveBodyOverrideWraper overrideBody = DirectiveUtils.getOverrideBody(env, name);
		if(overrideBody == null) {
			if(body != null) {
				body.render(env.getOut());
			}
		}else {
			DirectiveUtils.setTopBodyForParentBody(env, new TemplateDirectiveBodyOverrideWraper(body,env), overrideBody);
			overrideBody.render(env.getOut());
		}
	}
		
}