/* | |
* 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.el; | |
import javax.el.ELContext; | |
import javax.el.ValueExpression; | |
import javax.el.ValueReference; | |
import javax.faces.el.CompositeComponentExpressionHolder; | |
public class ValueReferenceResolver | |
{ | |
/** | |
* This method can be used to extract the ValueReference from the given ValueExpression. | |
* | |
* @param valueExpression The ValueExpression to resolve. | |
* @param elCtx The ELContext, needed to parse and execute the expression. | |
* @return The ValueReferenceWrapper. | |
*/ | |
public static ValueReference resolve(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); | |
} | |
return valueReference; | |
} | |
} | |