/*
    * 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
  
  }