/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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.myfaces.taglib.core;

 import javax.el.ELContext;

 import javax.el.ValueExpression;

 import javax.faces.application.Application;

 import javax.faces.context.FacesContext;

 import javax.faces.validator.Validator;

 import javax.faces.webapp.ValidatorELTag;

 import javax.servlet.jsp.JspException;

 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFJspAttribute;

 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFJspTag;

 /**

  * Creates a validator and associates it with the nearest parent UIComponent.

  * <p>

  * During the validation phase (or the apply-request-values phase for immediate components), if the associated component

  * has any submitted value and the conversion of that value to the required type has succeeded then the specified

  * validator type is invoked to test the validity of the converted value.

  * </p>

  * <p>

  * Commonly associated with an h:inputText entity, but may be applied to any input component.

  * </p>

  * <p>

  * Some validators may allow the component to use attributes to define component-specific validation constraints; see

  * the f:attribute tag. See also the "validator" attribute of all input components, which allows a component to specify

  * an arbitrary validation <i>method</i> (rather than a registered validation type, as this tag does).

  * </p>

  * <p>

  * Unless otherwise specified, all attributes accept static values or EL expressions.

  * </p>

  * 

  * @author Leonardo Uribe (latest modification by $Author$)

  * @version $Revision$ $Date$

  */

 @JSFJspTag(name = "f:validator", bodyContent = "empty")

 public class ValidatorImplTag extends ValidatorELTag

 {

     private ValueExpression _validatorId;

     private ValueExpression _binding;

     private String _validatorIdString = null;

     /**

      * The registered ID of the desired Validator.

      */

     @JSFJspAttribute(className="javax.el.ValueExpression",

             deferredValueType="java.lang.String")

     public void setValidatorId(ValueExpression validatorId)

     {

         _validatorId = validatorId;

     }

     /**

      * A ValueExpression that evaluates to an implementation of the javax.faces.validator.Validator interface.

      */

     @JSFJspAttribute(className="javax.el.ValueExpression",

             deferredValueType="javax.faces.validator.Validator")

     public void setBinding(ValueExpression binding)

     {

         _binding = binding;

     }

     /**

      * Use this method to specify the validatorId programmatically.

      * 

      * @param validatorIdString

      */

     public void setValidatorIdString(String validatorIdString)

     {

         _validatorIdString = validatorIdString;

     }

     @Override

     public void release()

     {

         super.release();

         _validatorId = null;

         _binding = null;

         _validatorIdString = null;

     }

     @Override

     protected Validator createValidator() throws javax.servlet.jsp.JspException

     {

         if (_validatorIdString != null)

         {

             return this.createClassicValidator();

         }

         if (_validatorId != null && _validatorId.isLiteralText())

         {

             return this.createClassicValidator();

         }

         return new DelegateValidator(_validatorId, _binding, _validatorIdString);

     }

     protected Validator createClassicValidator() throws javax.servlet.jsp.JspException

     {

         FacesContext facesContext = FacesContext.getCurrentInstance();

         ELContext elContext = facesContext.getELContext();

         if (null != _binding)

         {

             Object validator;

             try

             {

                 validator = _binding.getValue(elContext);

             }

             catch (Exception e)

             {

                 throw new JspException("Error while creating the Validator", e);

             }

             if (validator instanceof Validator)

             {

                 return (Validator)validator;

             }

         }

         Application application = facesContext.getApplication();

         Validator validator = null;

         try

         {

             // first check if an ValidatorId was set by a method

             if (null != _validatorIdString)

             {

                 validator = application.createValidator(_validatorIdString);

             }

             else if (null != _validatorId)

             {

                 String validatorId = (String)_validatorId.getValue(elContext);

                 validator = application.createValidator(validatorId);

             }

         }

         catch (Exception e)

         {

             throw new JspException("Error while creating the Validator", e);

         }

         if (null != validator)

         {

             if (null != _binding)

             {

                 _binding.setValue(elContext, validator);

             }

             return validator;

         }

         throw new JspException("validatorId and/or binding must be specified");

     }

 }