HistoryDifferencePathRenderer.java

package fr.openwide.core.basicapp.web.application.history.renderer;

import java.util.Locale;

import org.apache.wicket.model.IModel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Optional;

import fr.openwide.core.basicapp.core.business.history.model.HistoryDifference;
import fr.openwide.core.commons.util.fieldpath.FieldPath;
import fr.openwide.core.wicket.more.util.model.Models;

public final class HistoryDifferencePathRenderer extends AbstractHistoryRenderer<HistoryDifference> {
	private static final long serialVersionUID = 1L;
	
	private static final Logger LOGGER = LoggerFactory.getLogger(HistoryDifferencePathRenderer.class);
	
	private static final HistoryDifferencePathRenderer INSTANCE = new HistoryDifferencePathRenderer();
	
	public static HistoryDifferencePathRenderer get() {
		return INSTANCE;
	}
	
	private HistoryDifferencePathRenderer() {
	}

	@Override
	public String render(HistoryDifference difference, Locale locale) {
		FieldPath path = difference.getAbsolutePath();
		if (path.size() == 1 && path.isItem()) {
			return HistoryValueRenderer.get().render(difference.getPath().getKey(), locale);
		}
		
		String pathResourceKeyPart = getFieldPathKeyPart(path);
		IModel<?> keyDataModel = Models.transientModel(difference.getPath());
		String entityResourceKeyPart = getEntityResourceKeyPart(difference);
		
		Optional<String> result = getStringOptional(
				JOINER.join(HISTORY_DIFFERENCE_ROOT, entityResourceKeyPart, pathResourceKeyPart),
				locale, keyDataModel
		);
		if (!result.isPresent()) {
			result = getStringOptional(JOINER.join(BUSINESS_ROOT, entityResourceKeyPart, pathResourceKeyPart), locale, keyDataModel);
			if (!result.isPresent()) {
				result = getStringOptional(JOINER.join(HISTORY_DIFFERENCE_ROOT, ".common", pathResourceKeyPart), locale, keyDataModel);
				if (!result.isPresent()) {
					result = getStringOptional(JOINER.join(BUSINESS_ROOT, pathResourceKeyPart), locale, keyDataModel);
				}
			}
		}
		
		if (result.isPresent()) {
			return result.get();
		} else {
			LOGGER.error("Unable to find a localization key for the HistoryDifference (entity : '{}', path : '{}')",
					entityResourceKeyPart, pathResourceKeyPart);
			return pathResourceKeyPart;
		}
	}
}