src/commons/org/codehaus/groovy/grails/validation/MaxConstraint.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.codehaus.groovy.grails.commons.GrailsClassUtils;
  18 import org.springframework.validation.Errors;
  19
  20 /**
  21  * A Constraint that implements a maximum value constraint
  22  *
  23  * @author Graeme Rocher
  24  * @since 0.4
  25  *        <p/>
  26  *        Created: Jan 19, 2007
  27  *        Time: 8:19:14 AM
  28  */
  29 class MaxConstraint extends AbstractConstraint {
  30
  31
  32     private Comparable maxValue;
  33
  34     /**
  35      * @return Returns the maxValue.
  36      */
  37     public Comparable getMaxValue() {
  38         return maxValue;
  39     }
  40
  41
  42     /* (non-Javadoc)
  43      * @see org.codehaus.groovy.grails.validation.Constraint#supports(java.lang.Class)
  44      */
  45     public boolean supports(Class type) {
  46         return type != null && (Comparable.class.isAssignableFrom(type) ||
  47                         GrailsClassUtils.isAssignableOrConvertibleFrom(Number.class, type));
  48     }
  49
  50
  51     /* (non-Javadoc)
  52      * @see org.codehaus.groovy.grails.validation.ConstrainedProperty.AbstractConstraint#setParameter(java.lang.Object)
  53      */
  54     public void setParameter(Object constraintParameter) {
  55         if(constraintParameter == null) {
  56             throw new IllegalArgumentException("Parameter for constraint ["+ConstrainedProperty.MAX_CONSTRAINT+"] of property ["+constraintPropertyName+"] of class ["+constraintOwningClass+"] cannot be null");
  57         }
  58         if(!(constraintParameter instanceof Comparable) && (!constraintParameter.getClass().isPrimitive()))
  59             throw new IllegalArgumentException("Parameter for constraint ["+ConstrainedProperty.MAX_CONSTRAINT+"] of property ["+constraintPropertyName+"] of class ["+constraintOwningClass+"] must implement the interface [java.lang.Comparable]");
  60
  61         Class propertyClass = GrailsClassUtils.getPropertyType( constraintOwningClass, constraintPropertyName );
  62         if(!GrailsClassUtils.isAssignableOrConvertibleFrom( constraintParameter.getClass(),propertyClass ))
  63             throw new IllegalArgumentException("Parameter for constraint ["+ConstrainedProperty.MAX_CONSTRAINT+"] of property ["+constraintPropertyName+"] of class ["+constraintOwningClass+"] must be the same type as property: [" + propertyClass.getName() + "]");
  64
  65         this.maxValue = (Comparable)constraintParameter;
  66         super.setParameter(constraintParameter);
  67     }
  68
  69     public String getName() {
  70         return ConstrainedProperty.MAX_CONSTRAINT;
  71     }
  72
  73
  74     protected void processValidate(Object target, Object propertyValue, Errors errors) {
  75         if(maxValue.compareTo(propertyValue) < 0) {
  76             Object[] args = new Object[] { constraintPropertyName, constraintOwningClass, propertyValue, maxValue  };
  77             super.rejectValue(target,errors,ConstrainedProperty.DEFAULT_INVALID_MAX_MESSAGE_CODE,ConstrainedProperty.MAX_CONSTRAINT + ConstrainedProperty.EXCEEDED_SUFFIX,args);
  78         }
  79     }
  80 }