/*
* 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 javax.faces.validator;
import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.el.ValueReference;
import javax.faces.el.CompositeComponentExpressionHolder;
/**
* Utility class that isolates UEL calls, to prevent ClassNotFoundException
* when bean validation is used without it. It is a similar hack to the one
* used in portlet case.
*
* @since 2.0
*/
final class _BeanValidatorUELUtils
{
/**
* Get the ValueReference from the ValueExpression.
*
* @param valueExpression
* @param elCtx
* @return A ValueReferenceWrapper with the necessary information about the ValueReference.
*/
public static _ValueReferenceWrapper getUELValueReferenceWrapper(ValueExpression valueExpression,
final ELContext elCtx)
{
ValueReference valueReference = valueExpression.getValueReference(elCtx);
while (valueReference != null
&& valueReference.getBase() instanceof CompositeComponentExpressionHolder)
{
valueExpression = ((CompositeComponentExpressionHolder) valueReference.getBase())
.getExpression((String) valueReference.getProperty());
if(valueExpression == null)
{
break;
}
valueReference = valueExpression.getValueReference(elCtx);
}
if (valueReference != null)
{
return new _ValueReferenceWrapper(valueReference.getBase(), valueReference.getProperty());
}
return null;
}
}