/*
* Copyright 2004 The Apache Software Foundation.
*
* 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.apache.myfaces.renderkit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import javax.faces.FacesException;
import javax.faces.component.UIOutput;
import javax.faces.component.UISelectMany;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import javax.faces.el.ValueBinding;
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: baranda $)
* @version $Revision: 291887 $ $Date: 2005-09-27 06:09:38 -0400 (Tue, 27 Sep 2005) $
*/
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 binding
ValueBinding vb = component.getValueBinding("value");
if (vb == null) return null;
Class valueType = vb.getType(facesContext);
if (valueType == null) return null;
if (String.class.equals(valueType)) return null; //No converter needed for String type
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");
ValueBinding vb = component.getValueBinding("value");
Class valueType = null;
Class arrayComponentType = null;
if (vb != null)
{
valueType = vb.getType(facesContext);
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 (String.class.equals(arrayComponentType)) return submittedValue; //No conversion needed for String type
if (Object.class.equals(arrayComponentType)) return submittedValue; //No conversion for Object class
try
{
converter = facesContext.getApplication().createConverter(arrayComponentType);
}
catch (FacesException e)
{
log(facesContext, "No Converter for type " + arrayComponentType.getName() + " found", e);
return submittedValue;
}
}
// Now, we have a converter...
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;
}
else
{
//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));
}
}
private static final Log log = LogFactory.getLog(_SharedRendererUtils.class);
/**
* This method is different in the two versions of _SharedRendererUtils.
*/
private static void log(FacesContext context, String msg, Exception e)
{
log.error(msg, e);
}
}