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The public API classes of the Apache MyFaces CORE JSF-2.2 project
/*
* 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.component;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.List;
/**
* The util methods in this class are shared between the javax.faces.component package and
* the org.apache.myfaces.renderkit package.
* Please note: Any changes here must also apply to the class in the other package!
*
* @author Manfred Geiler (latest modification by $Author: skitching $)
* @version $Revision: 676298 $ $Date: 2008-07-13 05:31:48 -0500 (Sun, 13 Jul 2008) $
*/
class _SharedRendererUtils
{
static Converter findUIOutputConverter(FacesContext facesContext, UIOutput component)
{
// Attention!
// This code is duplicated in jsfapi component package.
// If you change something here please do the same in the other class!
Converter converter = component.getConverter();
if (converter != null) return converter;
//Try to find out by value expression
ValueExpression expression = component.getValueExpression("value");
if (expression == null) return null;
Class valueType = expression.getType(facesContext.getELContext());
if (valueType == null) return null;
if (Object.class.equals(valueType)) return null; //There is no converter for Object class
try
{
return facesContext.getApplication().createConverter(valueType);
}
catch (FacesException e)
{
log(facesContext, "No Converter for type " + valueType.getName() + " found", e);
return null;
}
}
static Object getConvertedUISelectManyValue(FacesContext facesContext,
UISelectMany component,
String[] submittedValue)
throws ConverterException
{
// Attention!
// This code is duplicated in jsfapi component package.
// If you change something here please do the same in the other class!
if (submittedValue == null) throw new NullPointerException("submittedValue");
ValueExpression expression = component.getValueExpression("value");
Class valueType = null;
Class arrayComponentType = null;
if (expression != null)
{
//By some strange reason vb.getType(facesContext.getELContext());
//does not return the same as vb.getValue(facesContext.getELContext()).getClass(),
//so we need to use this instead.
Object value = expression.getValue(facesContext.getELContext());
valueType = (value != null) ? value.getClass() :
expression.getType(facesContext.getELContext()) ;
if (valueType != null && valueType.isArray())
{
arrayComponentType = valueType.getComponentType();
}
}
Converter converter = component.getConverter();
if (converter == null)
{
if (valueType == null)
{
// No converter, and no idea of expected type
// --> return the submitted String array
return submittedValue;
}
if (List.class.isAssignableFrom(valueType))
{
// expected type is a List
// --> according to javadoc of UISelectMany we assume that the element type
// is java.lang.String, and copy the String array to a new List
int len = submittedValue.length;
List lst = new ArrayList(len);
for (int i = 0; i < len; i++)
{
lst.add(submittedValue[i]);
}
return lst;
}
if (arrayComponentType == null)
{
throw new IllegalArgumentException("ValueBinding for UISelectMany must be of type List or Array");
}
if (Object.class.equals(arrayComponentType)) return submittedValue; //No conversion for Object class
converter = facesContext.getApplication().createConverter(arrayComponentType);
if (converter == null)
{
return submittedValue;
}
}
// Now, we have a converter...
// We determine the type of the component array after converting one of it's elements
if (expression != null)
{
valueType = expression.getType(facesContext.getELContext());
if (valueType != null && valueType.isArray())
{
if (submittedValue.length > 0)
{
arrayComponentType = converter.getAsObject(facesContext, component, submittedValue[0]).getClass();
}
}
}
if (valueType == null)
{
// ...but have no idea of expected type
// --> so let's convert it to an Object array
int len = submittedValue.length;
Object [] convertedValues = (Object []) Array.newInstance(
arrayComponentType==null?Object.class:arrayComponentType,len);
for (int i = 0; i < len; i++)
{
convertedValues[i]
= converter.getAsObject(facesContext, component, submittedValue[i]);
}
return convertedValues;
}
if (List.class.isAssignableFrom(valueType))
{
// Curious case: According to specs we should assume, that the element type
// of this List is java.lang.String. But there is a Converter set for this
// component. Because the user must know what he is doing, we will convert the values.
int len = submittedValue.length;
List lst = new ArrayList(len);
for (int i = 0; i < len; i++)
{
lst.add(converter.getAsObject(facesContext, component, submittedValue[i]));
}
return lst;
}
if (arrayComponentType == null)
{
throw new IllegalArgumentException("ValueBinding for UISelectMany must be of type List or Array");
}
if (arrayComponentType.isPrimitive())
{
//primitive array
int len = submittedValue.length;
Object convertedValues = Array.newInstance(arrayComponentType, len);
for (int i = 0; i < len; i++)
{
Array.set(convertedValues, i,
converter.getAsObject(facesContext, component, submittedValue[i]));
}
return convertedValues;
}
//Object array
int len = submittedValue.length;
ArrayList convertedValues = new ArrayList(len);
for (int i = 0; i < len; i++)
{
convertedValues.add(i, converter.getAsObject(facesContext, component, submittedValue[i]));
}
return convertedValues.toArray((Object[]) Array.newInstance(arrayComponentType, len));
}
/**
* This method is different in the two versions of _SharedRendererUtils.
*/
private static void log(FacesContext context, String msg, Exception e)
{
context.getExternalContext().log(msg, e);
}
}
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