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package com.kangyonggan.app.freemarker;

import freemarker.core.Environment;
import freemarker.template.TemplateDirectiveBody;
import freemarker.template.TemplateDirectiveModel;
import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;

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

/**
 * @author kangyonggan
 * @since 16/4/29
 */
public class OverrideDirective implements TemplateDirectiveModel {

    public final static String DIRECTIVE_NAME = "override";

    @Override
    public void execute(Environment env,
                        Map params, TemplateModel[] loopVars,
                        TemplateDirectiveBody body) throws TemplateException, IOException {
        String name = DirectiveUtils.getRequiredParam(params, "name");
        String overrideVariableName = DirectiveUtils.getOverrideVariableName(name);

        TemplateDirectiveBodyOverrideWraper override = DirectiveUtils.getOverrideBody(env, name);
        TemplateDirectiveBodyOverrideWraper current = new TemplateDirectiveBodyOverrideWraper(body, env);
        if (override == null) {
            env.setVariable(overrideVariableName, current);
        } else {
            DirectiveUtils.setTopBodyForParentBody(env, current, override);
        }
    }

}