/*
* 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.empire.jsf2.pages;
import java.beans.FeatureDescriptor;
import java.util.Iterator;
import java.util.Map;
import javax.el.ELContext;
import javax.el.ELResolver;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import org.apache.empire.exceptions.MiscellaneousErrorException;
import org.apache.empire.jsf2.app.FacesUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class PageELResolver extends ELResolver
{
private static final Logger log = LoggerFactory.getLogger(PageELResolver.class);
@Override
public Class<?> getCommonPropertyType(ELContext context, Object base)
{
if (base==null)
log.warn("PageELResolver:getCommonPropertyType is not implemented!");
return null;
}
@Override
public Class<?> getType(ELContext context, Object base, Object property)
{
if (base==null && property.equals("page"))
{ // Page
// context.setPropertyResolved(true);
return Page.class;
}
return null;
}
@Override
public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext arg0, Object arg1)
{
log.warn("PageELResolver:getFeatureDescriptors is not implemented!");
return null;
}
@Override
public Object getValue(ELContext context, Object base, Object property)
{
if (base==null && property.equals("page"))
{
UIViewRoot vr = FacesContext.getCurrentInstance().getViewRoot();
if (vr==null)
{ // Error: No view root
RuntimeException e = new MiscellaneousErrorException("ViewRoot not available. Unable to get Page Bean.");
log.error(e.getMessage());
throw e;
}
Map<String,Object> vmap = vr.getViewMap(false);
Page page = (vmap!=null ? (Page)vmap.get("page") : null);
if (page==null)
{ // Error: No page bean
RuntimeException e = new MiscellaneousErrorException("Page bean not available for current view.");
log.error(e.getMessage());
throw e;
}
context.setPropertyResolved(true);
return page;
}
return null;
}
@Override
public boolean isReadOnly(ELContext context, Object base, Object property)
{
if (base==null && property.equals("page"))
{
context.setPropertyResolved(true);
return true;
}
return false;
}
@Override
public void setValue(ELContext context, Object base, Object property, Object value)
{
if (base==null && property.equals("page"))
{ // done
String pageAsString = String.valueOf(FacesUtils.getPage(FacesContext.getCurrentInstance()));
if (!pageAsString.equals(value))
log.warn("Page instances don't match");
// done
context.setPropertyResolved(true);
}
}
}