gate.thymeleaf.processors.attribute.LinkOrdenatorAttributeProcessor Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of gate Show documentation

A multipurpose java library

There is a newer version: 12.3.1

package gate.thymeleaf.processors.attribute;

import gate.util.Parameters;
import java.util.Optional;
import javax.enterprise.context.ApplicationScoped;
import javax.servlet.http.HttpServletRequest;
import org.thymeleaf.context.ITemplateContext;
import org.thymeleaf.context.IWebContext;
import org.thymeleaf.exceptions.TemplateProcessingException;
import org.thymeleaf.model.IProcessableElementTag;
import org.thymeleaf.processor.element.IElementTagStructureHandler;

@ApplicationScoped
public class LinkOrdenatorAttributeProcessor extends AttributeProcessor
{

	public LinkOrdenatorAttributeProcessor()
	{
		super("a", "ordenator");
	}

	@Override
	public void process(ITemplateContext context,
		IProcessableElementTag element,
		IElementTagStructureHandler handler)
	{
		String property = Optional.ofNullable(element.getAttributeValue("g:ordenator")).orElseThrow(()
			-> new TemplateProcessingException("Missing required property on g:ordenator"));

		IWebContext webContext = (IWebContext) context;
		HttpServletRequest request = webContext.getRequest();
		String orderBy = request.getParameter("orderBy");
		Parameters queryString = Parameters.parse(request.getQueryString());
		Optional.ofNullable(element.getAttributeValue("arguments")).map(Parameters::parse).ifPresent(queryString::putAll);
		queryString.remove("orderBy");

		String desc = "-" + property;

		if (property.equals(orderBy))
		{
			queryString.put("orderBy", desc);
			handler.setAttribute("href", String.format("Gate?%s", queryString.toString()));
		} else if (desc.equals(orderBy))
		{
			handler.setAttribute("href", String.format("Gate?%s", queryString.toString()));
		} else
		{
			queryString.put("orderBy", property);
			handler.setAttribute("href", String.format("Gate?%s", queryString.toString()));
		}
	}
}