package org.jtheque.core.utils.ui.constraints;

 import org.jtheque.core.managers.error.JThequeError;

 import org.jtheque.core.utils.ui.ValidationUtils;

 import java.util.Collection;

 /*

  * This file is part of JTheque.

  *

  * JTheque is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, either version 3 of the License.

  *

  * JTheque 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 General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with JTheque.  If not, see <http://www.gnu.org/licenses/>.

  */

 /**

  * A constraint to set a max length.

  *

  * @author Baptiste Wicht

  */

 public final class MaxLengthConstraint implements Constraint {

     private final int maxLength;

     private final String fieldName;

     private final boolean canBenNull;

     private final boolean numerical;

     /**

      * Construct a new MaxLengthConstraint.

      *

      * @param maxLength  The maximum length of the field.

      * @param fieldName  The field name.

      * @param canBenNull Can the field be null ?

      * @param numerical  Must the field be numerical ?

      */

     public MaxLengthConstraint(int maxLength, String fieldName, boolean canBenNull, boolean numerical) {

         super();

         this.maxLength = maxLength;

         this.fieldName = fieldName;

         this.canBenNull = canBenNull;

         this.numerical = numerical;

     }

     @Override

     public int maxLength() {

         return maxLength;

     }

     @Override

     public boolean mustBeNumerical() {

         return numerical;

     }

     @Override

     public boolean canBeNullOrEmpty() {

         return canBenNull;

     }

     @Override

     public boolean mustControlLength() {

         return true;

     }

     @Override

     public void validate(Object field, Collection<JThequeError> errors) {

         CharSequence str = (CharSequence) field;

         if (!canBenNull) {

             ValidationUtils.rejectIfEmpty(str, fieldName, errors);

         }

         ValidationUtils.rejectIfLongerThan(str, fieldName, maxLength, errors);

     }

 }