/
ValueExpressionAnalyzer.java
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/
ValueExpressionAnalyzer.java
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/*
* Copyright 2009-2014 PrimeTek.
*
* 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.primefaces.el;
import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.el.ValueReference;
import javax.faces.el.CompositeComponentExpressionHolder;
public class ValueExpressionAnalyzer {
public static ValueReference getReference(ELContext elContext, ValueExpression expression) {
ValueReference reference = intercept(elContext, expression);
if (reference != null) {
Object base = reference.getBase();
if (base != null && base instanceof CompositeComponentExpressionHolder) {
ValueExpression ve = ((CompositeComponentExpressionHolder) base).getExpression((String) reference.getProperty());
if (ve != null)
{
reference = getReference(elContext, ve);
}
}
}
return reference;
}
public static ValueExpression getExpression(ELContext elContext, ValueExpression expression) {
ValueReference reference = intercept(elContext, expression);
if (reference != null) {
Object base = reference.getBase();
if (base != null && base instanceof CompositeComponentExpressionHolder) {
ValueExpression ve = ((CompositeComponentExpressionHolder) base).getExpression((String) reference.getProperty());
if (ve != null)
{
return ve;
}
}
}
return expression;
}
public static ValueReference intercept(ELContext elContext, ValueExpression expression) {
if (expression == null) {
return null;
}
InterceptingResolver resolver = new InterceptingResolver(elContext.getELResolver());
ELContext interceptingContext = new InterceptingContext(elContext, resolver);
// #getType throws a PropertyNotFoundException when a sub-expression is null
expression.getType(interceptingContext);
// intercept EL calls
expression.getValue(interceptingContext);
return resolver.getValueReference();
}
}