/*
    * Copyright 2006 Werner Guttmann
    *
    * 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.exolab.castor.xml.validators;
  
  import org.exolab.castor.mapping.ClassDescriptor;
  import org.exolab.castor.mapping.FieldDescriptor;
  import org.exolab.castor.mapping.FieldHandler;
  import org.exolab.castor.xml.ClassDescriptorResolver;
  import org.exolab.castor.xml.TypeValidator;
  import org.exolab.castor.xml.ValidationContext;
  import org.exolab.castor.xml.ValidationException;
  
  /**
   * The IDREF Validation class.
   *
   * @author <a href="mailto:werner DOT guttmann AT gmx DOT net">Werner Guttman</a>
   * @version $Revision: 0000 $ $Date: $
   */
  public class IdRefValidator implements TypeValidator {
  
      /**
       * Creates a new IdRefValidator with no restrictions.
       */
      public IdRefValidator() {
          super();
      } //-- IdValidator
  
      /**
       * Validates the given Object.
       *
       * @param object the Object to validate
       * @param context the ValidationContext
       * @throws ValidationException if the object fails validation.
       */
      public void validate(final Object object, final ValidationContext context)
      throws ValidationException {
          // we need a target Object
          if (object == null) {
              String err = "The object associated with IDREF \"" + object + "\" is null!";
              throw new ValidationException(err);
          }
  
          // get the id of the target object
          String id = null;
          try {
              ClassDescriptorResolver classDescriptorResolver = context.getClassDescriptorResolver();
              ClassDescriptor classDescriptor = classDescriptorResolver.resolve(object.getClass());
              FieldDescriptor fieldDescriptor = classDescriptor.getIdentity();
              FieldHandler fieldHandler = fieldDescriptor.getHandler();
              id = (String) fieldHandler.getValue(object);
          } catch (Exception e) {
              String err = "The object associated with IDREF \"" + object
              + "\" of type " + object.getClass() + " has no ID!";
              throw new ValidationException(err);
          }
  
          if (id == null) {
              String err = "The object associated with IDREF \"" + object + "\" has no ID!";
              throw new ValidationException(err);
          }
  
          // check if referenced id exists, otherwise put it into "currently unresolved" queue
          context.checkIdRef(id);
  
          // validate(value, context);
      } //-- validate
  
  }