/* | |
* 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.extensions.validator.util; | |
import javax.el.ValueExpression; | |
import javax.faces.component.UIComponent; | |
import javax.faces.context.FacesContext; | |
/** | |
* in order to centralize the jsf version dependency within the core | |
* | |
* @author Gerhard Petracek | |
*/ | |
//TODO | |
public class ELUtils | |
{ | |
public static Class getTypeOfValueBindingForExpression( | |
FacesContext facesContext, String valueBindingExpression) | |
{ | |
//due to a restriction with the ri | |
Object bean = ELUtils.getValueOfExpression(facesContext, | |
valueBindingExpression); | |
return (bean != null) ? bean.getClass() : null; | |
} | |
public static Object getBean(String beanName) | |
{ | |
FacesContext facesContext = FacesContext.getCurrentInstance(); | |
return facesContext.getApplication().getELResolver().getValue( | |
facesContext.getELContext(), null, beanName); | |
} | |
//TODO refactor - problem - static values - jsf 1.2 e.g.: ${value} | |
public static Object getBaseObject(String valueBindingExpression, UIComponent uiComponent) | |
{ | |
if (valueBindingExpression.lastIndexOf(".") == -1) | |
{ | |
return uiComponent.getValueExpression("value").getValue(FacesContext.getCurrentInstance().getELContext()); | |
} | |
return getBaseObject(valueBindingExpression); | |
} | |
public static Object getBaseObject(String valueBindingExpression) | |
{ | |
String newExpression = valueBindingExpression.substring(0, valueBindingExpression.lastIndexOf(".")) + "}"; | |
return getValueOfExpression(FacesContext.getCurrentInstance(), | |
newExpression); | |
} | |
public static Object getValueOfExpression(FacesContext facesContext, String valueBindingExpression) | |
{ | |
return (valueBindingExpression != null) ? facesContext.getApplication().evaluateExpressionGet(facesContext, | |
valueBindingExpression, Object.class) : null; | |
} | |
public static boolean isExpressionValid(FacesContext facesContext, String valueBindingExpression) | |
{ | |
try | |
{ | |
facesContext.getApplication().evaluateExpressionGet(facesContext, valueBindingExpression, Object.class); | |
} | |
catch (Throwable t) | |
{ | |
return false; | |
} | |
return true; | |
} | |
public static String getReliableValueBindingExpression( | |
UIComponent uiComponent) | |
{ | |
String valueBindingExpression = getValueBindingExpression(uiComponent); | |
String baseExpression = valueBindingExpression; | |
if (baseExpression.contains(".")) | |
{ | |
baseExpression = baseExpression.substring(0, valueBindingExpression.lastIndexOf(".")) + "}"; | |
} | |
if (getTypeOfValueBindingForExpression(FacesContext.getCurrentInstance(), baseExpression) == null) | |
{ | |
valueBindingExpression = FaceletsTaglibExpressionUtils. | |
tryToCreateValueBindingForFaceletsBinding(uiComponent); | |
} | |
return valueBindingExpression; | |
} | |
public static String getValueBindingExpression(UIComponent uiComponent) | |
{ | |
ValueExpression valueExpression = uiComponent | |
.getValueExpression("value"); | |
return (valueExpression != null) ? valueExpression | |
.getExpressionString() : null; | |
} | |
public static Class getTypeOfValueBindingForComponent( | |
FacesContext facesContext, UIComponent uiComponent) | |
{ | |
ValueExpression valueExpression = uiComponent | |
.getValueExpression("value"); | |
return (valueExpression != null) ? valueExpression.getType(facesContext | |
.getELContext()) : null; | |
} | |
} |