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  // Copyright 2005 The Apache Software Foundation
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 package org.apache.tapestry.form.validator;
 
 
Validator that ensures a value was supplied.

Author(s):
Howard Lewis Ship
Since:
4.0
 
 public class Required extends BaseValidator
 {
     public Required()
     {
     }
 
     public Required(String initializer)
     {
         super(initializer);
     }
 
     public boolean getAcceptsNull()
     {
         return true;
     }
 
     public void validate(IFormComponent fieldValidationMessages messagesObject object)
             throws ValidatorException
     {
         if (field.isDisabled())
             return;
         
         if ((object == null)
                 || (String.class.isInstance(object) && (((Stringobject).length() == 0))
                 || (Collection.class.isInstance(object) && ((Collectionobject).isEmpty())
                 || (UploadPart.class.isInstance(object) && ((UploadPartobject).getSize() < 1))
         {
             String message = buildMessage(messagesfield);
             throw new ValidatorException(message.);
         }
     }
     
     public String buildMessage(ValidationMessages messagesIFormComponent field)
     {
         return messages.formatValidationMessage(
                 getMessage(),
                 .,
                 new Object[]
                 { field.getDisplayName() });
     }
     
     public void renderContribution(IMarkupWriter writerIRequestCycle cycle,
             FormComponentContributorContext contextIFormComponent field)
     {
         if(field.isDisabled())
             return;
         
         
         JSONObject profile = context.getProfile();
         
         accumulateProperty(profile.field.getClientId());
         
         accumulateProfileProperty(fieldprofile
                 .buildMessage(contextfield));
     }

    
Returns true, that's what Required means!
 
     public boolean isRequired()
     {
         return true;
    }
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