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/**
 * 
 */
package mtons.freemarker.directive;

import freemarker.core.Environment;
import freemarker.template.TemplateDirectiveBody;
import freemarker.template.TemplateDirectiveModel;
import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import mtons.freemarker.handler.DirectiveHandler;
import mtons.freemarker.handler.RenderHandler;

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

/**
 * Template Directive
 * 
 * @author langhsu
 *
 */
public abstract class TemplateDirective implements TemplateDirectiveModel {
	protected Log logger = LogFactory.getLog(TemplateDirective.class);

	protected static String RESULT = "result";
	protected static String RESULTS = "results";
	protected static String PAGE = "page";

	@Override
	public void execute(Environment env, Map parameters,
                        TemplateModel[] loopVars, TemplateDirectiveBody body) throws TemplateException, IOException {
		try {
			execute(new DirectiveHandler(env, parameters, loopVars, body));
		} catch (IOException e) {
			throw e;
		} catch (Exception e) {
			logger.error(e.getMessage(), e);
			throw new TemplateException(e, env);
		}
	}

	abstract public String getName();
	abstract public void execute(RenderHandler handler) throws Exception;

}