com.github.dandelion.datatables.thymeleaf.processor.TableInitializerElProcessor Maven / Gradle / Ivy

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package com.github.dandelion.datatables.thymeleaf.processor;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.thymeleaf.Arguments;
import org.thymeleaf.context.IWebContext;
import org.thymeleaf.dom.Element;
import org.thymeleaf.processor.IElementNameProcessorMatcher;
import org.thymeleaf.processor.ProcessorResult;

import com.github.dandelion.datatables.core.exception.BadConfigurationException;
import com.github.dandelion.datatables.core.html.HtmlTable;
import com.github.dandelion.datatables.core.properties.PropertiesLoader;
import com.github.dandelion.datatables.core.util.RequestHelper;
import com.github.dandelion.datatables.core.util.ResourceHelper;
import com.github.dandelion.datatables.thymeleaf.dialect.DataTablesDialect;
import com.github.dandelion.datatables.thymeleaf.dialect.AbstractDatatablesElProcessor;

/**
 * 
 * Element processor applied to the HTML table tag.
 * 
 * @author Thibault Duchateau
 */
public class TableInitializerElProcessor extends AbstractDatatablesElProcessor {

	// Logger
	private static Logger logger = LoggerFactory.getLogger(TableInitializerElProcessor.class);

	public TableInitializerElProcessor(IElementNameProcessorMatcher matcher) {
		super(matcher);
	}

	@Override
	public int getPrecedence() {
		return DataTablesDialect.DT_HIGHEST_PRECEDENCE;
	}

	@Override
	protected ProcessorResult doProcessElement(Arguments arguments, Element element, HtmlTable table) {
		String tableId = element.getAttributeValue("id");
		logger.debug("{} element found with id {}", element.getNormalizedName(), tableId);

		HttpServletRequest request = ((IWebContext) arguments.getContext()).getHttpServletRequest();

		if (tableId == null) {
			logger.error("The 'id' attribute is required.");
			throw new IllegalArgumentException();
		} else {
			HtmlTable htmlTable = new HtmlTable(tableId, ResourceHelper.getRamdomNumber());
			htmlTable.setCurrentUrl(RequestHelper.getCurrentUrl(request));

			try {
				// Load table properties
				PropertiesLoader.load(htmlTable);
			} catch (BadConfigurationException e) {
				logger.error("Unable to load Dandelion-datatables configuration");
				e.printStackTrace();
			}

			// Add default footer and header row
			htmlTable.addHeaderRow();
			htmlTable.addFooterRow();

			// Add a "finalizing div" after the HTML table tag in order to
			// finalize the Dandelion-datatables configuration generation
			// The div will be removed in its processor
			Element div = new Element("div");
			div.setAttribute(DataTablesDialect.DIALECT_PREFIX + ":tmp", "internalUse");
			div.setRecomputeProcessorsImmediately(true);
			element.getParent().insertAfter(element, div);

			// Store the htmlTable POJO as a request attribute, so all the
			// others following HTML tags can access it and particularly the
			// "finalizing div"
			((IWebContext) arguments.getContext()).getHttpServletRequest().setAttribute(
					"htmlTable", htmlTable);

			// The table node is also saved in the request, to be easily accessed later
			((IWebContext) arguments.getContext()).getHttpServletRequest().setAttribute(
					"tableNode", element);
			
			// Don't forget to remove the attribute
			element.removeAttribute(DataTablesDialect.DIALECT_PREFIX + ":table");

			return ProcessorResult.OK;
		}
	}
}