src/org/mxchange/jcoreee/validator/number/BaseNumberValidator.java

   1 /*
   2  * Copyright (C) 2016, 2017 Roland Häder
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 package org.mxchange.jcoreee.validator.number;
  18
  19 import java.text.MessageFormat;
  20 import javax.faces.application.FacesMessage;
  21 import javax.faces.component.UIComponent;
  22 import javax.faces.context.FacesContext;
  23 import javax.faces.validator.Validator;
  24 import javax.faces.validator.ValidatorException;
  25 import org.mxchange.jcoreee.validator.BaseObjectValidator;
  26
  27 /**
  28  * A general number value validator.
  29  * <p>
  30  * @author Roland Häder<roland@mxchange.org>
  31  */
  32 public abstract class BaseNumberValidator extends BaseObjectValidator implements Validator {
  33
  34         /**
  35          * Serial number
  36          */
  37         private static final long serialVersionUID = 25_481_878_590_589_321L;
  38
  39         @Override
  40         public void preValidate (final FacesContext context, final UIComponent component, final Object value, final String[] requiredFields, Boolean allowNull) throws ValidatorException {
  41                 // Trace message
  42                 //* NOISY-DEBUG: */ System.out.println(MessageFormat.format("preValidate: context={0},component={1},value={2},requiredFields={3},allowNull={4} - CALLED!", context, component, value, Arrays.toString(requiredFields, allowNull))); //NOI18N
  43
  44                 // Pre-validate
  45                 super.preValidate(context, component, value, requiredFields, allowNull);
  46
  47                 // Get client id and init message + key
  48                 String clientId = component.getClientId();
  49                 String requiredMessage = null;
  50
  51                 // So far all fine, no check if the field is fine
  52                 for (final String field : requiredFields) {
  53                         // Debug message
  54                         //this.getLogger().logDebug(MessageFormat.format("preValidate: field={0},clientId={1}", field, clientId)); //NOI18N
  55
  56                         // Is it the same?
  57                         if (clientId.endsWith(field)) {
  58                                 // Init variables
  59                                 Number number = null;
  60
  61                                 // Compare value's type, supported: String, Long, Integer
  62                                 if (value instanceof String) {
  63                                         // Is a string, then try to parse it as Long, largest range
  64                                         try {
  65                                                 number = Long.valueOf((String) value);
  66                                         } catch (final NumberFormatException ex) {
  67                                                 // Cannot parse string to long
  68                                                 requiredMessage = MessageFormat.format("Field {0} cannot be parsed to long: {1}, exception:{2}", field, value, ex);
  69
  70                                                 // Abort processing here
  71                                                 break;
  72                                         }
  73                                 } else if ((value instanceof Integer) || (value instanceof Long) || (value instanceof Short)) {
  74                                         // Is any used number
  75                                         number = (Number) value;
  76                                 }
  77
  78                                 // Is the number below zero? Casting again largest range will not result in unexpected comparison
  79                                 if ((!allowNull) && ((number instanceof Number) && ((Long) number < 0))) {
  80                                         // Generate message
  81                                         requiredMessage = MessageFormat.format("Value {0} for field {1} is below zero.", number, field); //NOI18N
  82
  83                                         // Abort processing here
  84                                         break;
  85                                 }
  86                         }
  87                 }
  88
  89                 // Is facesMessage set?
  90                 if (null != requiredMessage) {
  91                         // Abort here
  92                         throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR, requiredMessage, requiredMessage));
  93                 }
  94         }
  95
  96 }