TaskScopeResolver.java
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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2009 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package jsf2.demo.scrum.web.scope;
import java.beans.FeatureDescriptor;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;
import javax.el.ELContext;
import javax.el.ELResolver;
import javax.el.PropertyNotFoundException;
import javax.faces.context.FacesContext;
/**
* Resolver to #{taskScope} expression.
* @author eder
*/
public class TaskScopeResolver extends ELResolver {
private static final String SCOPE_NAME = "taskScope";
@Override
public Class<?> getCommonPropertyType(ELContext context, Object base) {
if (base != null) {
return null;
}
return String.class;
}
@Override
public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
return Collections.<FeatureDescriptor>emptyList().iterator();
}
@Override
public Class<?> getType(ELContext context, Object base, Object property) {
return Object.class;
}
@Override
public Object getValue(ELContext context, Object scope, Object property) {
if (property == null) {
throw new PropertyNotFoundException();
}
if (scope == null && SCOPE_NAME.equals(property.toString())) {
TaskScope scopeManager = getScope(context);
context.setPropertyResolved(true);
return scopeManager;
} else if (scope != null && scope instanceof TaskScope) {
//looking for bean in scope already created.
return lookupBean(context, (TaskScope) scope, property.toString());
} else if (scope == null) {
return lookupBean(context, getScope(context), property.toString());
}
return null;
}
@Override
public boolean isReadOnly(ELContext context, Object base, Object property) {
return true;
}
@Override
public void setValue(ELContext context, Object base, Object property, Object value) {
}
private TaskScope getScope(ELContext context) {
//looking for custom scope in the session
//if doesn't exists create and put it in the session
FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class);
Map<String,Object> sessionMap = facesContext.getExternalContext().getSessionMap();
TaskScope scopeManager = (TaskScope) sessionMap.get(SCOPE_NAME);
if (scopeManager == null) {
scopeManager = new TaskScope(facesContext.getApplication());
sessionMap.put(SCOPE_NAME, scopeManager);
scopeManager.notifyCreate(SCOPE_NAME,facesContext);
}
return scopeManager;
}
private Object lookupBean(ELContext context, TaskScope scope, String key) {
//looking for mbean in taskScope
Object value = scope.get(key);
context.setPropertyResolved(value != null);
return value;
}
public static void destroyScope() {
//remove scope from the session
FacesContext ctx = FacesContext.getCurrentInstance();
Map<String,Object> sessionMap = ctx.getExternalContext().getSessionMap();
TaskScope taskScope = (TaskScope) sessionMap.remove(SCOPE_NAME);
if (taskScope != null)
taskScope.notifyDestroy(SCOPE_NAME, ctx);
}
}