/* | |
* 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); | |
} | |
} | |
} |