Java tutorial
/** * Copyright 2002 Instituto Superior Tcnico * * This file is part of FenixEdu Core. * * FenixEdu Core is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * FenixEdu Core is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with FenixEdu Core. If not, see <http://www.gnu.org/licenses/>. */ /* * Created on 3/Dez/2003 * */ package net.sourceforge.fenixedu.presentationTier.validator.form; import java.util.Comparator; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import org.apache.commons.validator.Field; import org.apache.commons.validator.GenericValidator; import org.apache.commons.validator.ValidatorAction; import org.apache.commons.validator.util.ValidatorUtils; import org.apache.struts.action.ActionMessage; import org.apache.struts.action.ActionMessages; import org.apache.struts.validator.Resources; /** * @author Leonor Almeida * @author Sergio Montelobo * */ public class ValidateCompareTwoFields { final private static int VALUE = 11; /** * Compares the two fields using the given comparator * * @param bean * @param va * @param field * @param errors * @param request * @param comparator * @return */ private static boolean validate(Object bean, ValidatorAction va, Field field, ActionMessages errors, HttpServletRequest request, Comparator comparator) { String greaterInputString = ValidatorUtils.getValueAsString(bean, field.getProperty()); String secondProperty = field.getVarValue("secondProperty"); String lowerInputString = ValidatorUtils.getValueAsString(bean, secondProperty); if (!GenericValidator.isBlankOrNull(lowerInputString) && !GenericValidator.isBlankOrNull(greaterInputString)) { try { Double lowerInput = new Double(lowerInputString); Double greaterInput = new Double(greaterInputString); // if comparator result != VALUE then the condition is false if (comparator.compare(lowerInput, greaterInput) != VALUE) { errors.add(field.getKey(), Resources.getActionMessage(request, va, field)); return false; } return true; } catch (NumberFormatException e) { errors.add(field.getKey(), new ActionMessage(va.getMsg())); return false; } } return true; } /** * Compares two fields and checks if second field >= first field * * @param bean * @param va * @param field * @param errors * @param request * @param application * @return */ public static boolean validateGreaterThanOrEqual(Object bean, ValidatorAction va, Field field, ActionMessages errors, HttpServletRequest request, ServletContext application) { return validate(bean, va, field, errors, request, new Comparator() { @Override public int compare(Object o1, Object o2) { Double d1 = (Double) o1; Double d2 = (Double) o2; int result = d1.compareTo(d2); if (result <= 0) { result = VALUE; } return result; } }); } /** * Compares two fields and checks if second field > first field * * @param bean * @param va * @param field * @param errors * @param request * @param application * @return */ public static boolean validateGreaterThan(Object bean, ValidatorAction va, Field field, ActionMessages errors, HttpServletRequest request, ServletContext application) { return validate(bean, va, field, errors, request, new Comparator() { @Override public int compare(Object o1, Object o2) { Double d1 = (Double) o1; Double d2 = (Double) o2; int result = d1.compareTo(d2); if (result < 0) { result = VALUE; } return result; } }); } /** * Compares two fields and checks if second field == first field * * @param bean * @param va * @param field * @param errors * @param request * @param application * @return */ public static boolean validateEqual(Object bean, ValidatorAction va, Field field, ActionMessages errors, HttpServletRequest request, ServletContext application) { return validate(bean, va, field, errors, request, new Comparator() { @Override public int compare(Object o1, Object o2) { Double d1 = (Double) o1; Double d2 = (Double) o2; int result = d1.compareTo(d2); if (result == 0) { result = VALUE; } return result; } }); } /** * Compares two fields and checks if the second field < first field * * @param bean * @param va * @param field * @param errors * @param request * @param application * @return */ public static boolean validateLessThan(Object bean, ValidatorAction va, Field field, ActionMessages errors, HttpServletRequest request, ServletContext application) { return validate(bean, va, field, errors, request, new Comparator() { @Override public int compare(Object o1, Object o2) { Double d1 = (Double) o1; Double d2 = (Double) o2; int result = d1.compareTo(d2); if (result > 0) { result = VALUE; } return result; } }); } /** * Compares two fields and checks if the second field <= first field * * @param bean * @param va * @param field * @param errors * @param request * @param application * @return */ public static boolean validateLessThanOrEqual(Object bean, ValidatorAction va, Field field, ActionMessages errors, HttpServletRequest request, ServletContext application) { return validate(bean, va, field, errors, request, new Comparator() { @Override public int compare(Object o1, Object o2) { Double d1 = (Double) o1; Double d2 = (Double) o2; int result = d1.compareTo(d2); if (result >= 0) { result = VALUE; } return result; } }); } }