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jFormchecker integration utils that connects it to frameworks/APIs

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package de.jformchecker.adapter;

import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.beanutils.PropertyUtils;

import de.jformchecker.FormChecker;
import de.jformchecker.FormCheckerConfig;
import de.jformchecker.FormCheckerElement;
import de.jformchecker.FormCheckerForm;

/**
 * Facade for formchecker for most easy use in standard situations
 * @author jochen
 *
 */
public class FC {

	FormChecker fcInstance;
	
	/**
	 * Normal, not xsrf secured formchecker from httpservletrequest
	 * @param config
	 * @param request
	 * @param form
	 * @return
	 */
	public static FC simple(FormCheckerConfig config, HttpServletRequest request, FormCheckerForm form) {
		FC fc = new FC();
		fc.fcInstance = FormChecker.build(key -> saveTrim(request.getParameter(key)), form)
				.setConfig(config)
				.run();
		return fc;
	}
	
	/**
	 * Normal, not xsrf secured formchecker from Parameter-Map (Useful in spring-controllers) 
	 * @param config
	 * @param paramMap
	 * @param form
	 * @return
	 */
	public static FC simple(FormCheckerConfig config, Map paramMap, FormCheckerForm form) {
		FC fc = new FC();
		fc.fcInstance = FormChecker.build(key -> saveTrim(paramMap.get(key)), form)
				.setConfig(config)
				.run();
		return fc;
	}
	
	public static FC simpleFromBean(FormCheckerConfig config, Object bean, FormCheckerForm form) {
		FC fc = new FC();
			fc.fcInstance = FormChecker.build(key -> {
				
				try {
					return ""+PropertyUtils.getProperty(bean, key);
				} catch (Exception e) {
					return "";
				}
			}
				
			, form)
					.setConfig(config)
					.run();
		
		return fc;
	}

	public boolean isOk() {
		if (fcInstance.isValidAndNotFirstRun()) {
			return true;
		}
		return false;
	}
	
	public List getFieldList() {
		return fcInstance.getForm().getElements();
	}
	
	public Map getFields() {
		return fcInstance.getForm().getElementsAsMap();
	}
	
	public String getValueFor(String fieldName) {
		return fcInstance.getForm().getElementsAsMap().get(fieldName).getValue();
	}
	
	public static FC secure(FormCheckerConfig config, HttpServletRequest request, FormCheckerForm form) {
		FC fc = new FC();

		fc.fcInstance = FormChecker.build(key -> saveTrim(request.getParameter(key)), form).
				setProtectAgainstCSRF(
				key -> request.getSession().getAttribute(key), 
				(k,v)-> request.getSession().setAttribute(k, v)
				).setConfig(config)
				.run();

		
		return fc;
	}

	public FormChecker getFcInstance() {
		return fcInstance;
	}
	
	private static String saveTrim(String t) {
		if (t != null) {
			return t.trim();
		} else {
			return null;
		}
	}
}