src/commons/org/codehaus/groovy/grails/validation/NullableConstraint.java

   1 /* Copyright 2004-2005 Graeme Rocher
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at
   6  *
   7  *      http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 package org.codehaus.groovy.grails.validation;
  16
  17 import org.springframework.validation.Errors;
  18
  19 /**
  20  * A Constraint that validates not equal to something
  21  *
  22  * @author Graeme Rocher
  23  * @author Sergey Nebolsin
  24  * @since 0.4
  25  */
  26 class NullableConstraint extends AbstractVetoingConstraint {
  27
  28     private boolean nullable;
  29
  30
  31     public boolean isNullable() {
  32         return nullable;
  33     }
  34
  35     /* (non-Javadoc)
  36      * @see org.codehaus.groovy.grails.validation.Constraint#supports(java.lang.Class)
  37      */
  38     public boolean supports(Class type) {
  39         return type != null && !type.isPrimitive();
  40     }
  41
  42     /* (non-Javadoc)
  43      * @see org.codehaus.groovy.grails.validation.ConstrainedProperty.AbstractConstraint#setParameter(java.lang.Object)
  44      */
  45     public void setParameter(Object constraintParameter) {
  46         if(!(constraintParameter instanceof Boolean))
  47             throw new IllegalArgumentException("Parameter for constraint ["+ConstrainedProperty.NULLABLE_CONSTRAINT+"] of property ["+constraintPropertyName+"] of class ["+constraintOwningClass+"] must be a boolean value");
  48
  49         this.nullable = ((Boolean)constraintParameter).booleanValue();
  50         super.setParameter(constraintParameter);
  51     }
  52
  53     public String getName() {
  54         return ConstrainedProperty.NULLABLE_CONSTRAINT;
  55     }
  56
  57     protected boolean skipNullValues() {
  58         return false;
  59     }
  60
  61     protected boolean processValidateWithVetoing(Object target, Object propertyValue, Errors errors) {
  62         if(propertyValue == null) {
  63             if(!nullable) {
  64                 Object[] args = new Object[] { constraintPropertyName, constraintOwningClass};
  65                 super.rejectValue(target, errors, ConstrainedProperty.DEFAULT_NULL_MESSAGE_CODE, ConstrainedProperty.NULLABLE_CONSTRAINT,args );
  66                 // null value is catched by 'blank' constraint, no addition validation needed
  67                 return true;
  68             }
  69         }
  70         return false;
  71     }
  72 }