org.apache.myfaces.el.ELResolverBuilder Maven / Gradle / Ivy
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* 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.myfaces.el;
import java.util.Collections;
import java.util.List;
import java.util.function.Predicate;
import java.util.logging.Level;
import java.util.logging.Logger;
import jakarta.el.CompositeELResolver;
import jakarta.el.ELResolver;
import jakarta.enterprise.inject.spi.BeanManager;
import jakarta.faces.application.ProjectStage;
import jakarta.faces.context.FacesContext;
import java.util.stream.Collectors;
import org.apache.myfaces.cdi.util.CDIUtils;
import org.apache.myfaces.config.RuntimeConfig;
import org.apache.myfaces.config.webparameters.MyfacesConfig;
import org.apache.myfaces.util.ExternalSpecifications;
/**
* The ELResolverBuilder is responsible to build the el resolver which is used by the application through
* {@link jakarta.faces.application.Application#getELResolver()} according to 1.2 spec
* section 5.6.2
*
* @author Mathias Broekelmann (latest modification by $Author$)
* @version $Revision$ $Date$
*/
public class ELResolverBuilder
{
private static final Logger log = Logger.getLogger(ELResolverBuilder.class.getName());
protected final RuntimeConfig runtimeConfig;
protected final MyfacesConfig myfacesConfig;
public ELResolverBuilder(RuntimeConfig runtimeConfig, MyfacesConfig myfacesConfig)
{
this.runtimeConfig = runtimeConfig;
this.myfacesConfig = myfacesConfig;
}
/**
* add the el resolvers from the faces config, the el resolver wrapper for variable resolver, the el resolver
* wrapper for the property resolver and the el resolvers added by
* {@link jakarta.faces.application.Application#addELResolver(ELResolver)}.
* The resolvers where only added if they are not null
*
* @param resolvers
*/
protected void addFromRuntimeConfig(List resolvers)
{
if (runtimeConfig.getFacesConfigElResolvers() != null)
{
resolvers.addAll(runtimeConfig.getFacesConfigElResolvers());
}
if (runtimeConfig.getApplicationElResolvers() != null)
{
resolvers.addAll(runtimeConfig.getApplicationElResolvers());
}
}
protected List wrapELResolvers(List resolvers)
{
if (!myfacesConfig.isElResolverTracing() || myfacesConfig.getProjectStage() != ProjectStage.Development)
{
return resolvers;
}
return resolvers.stream()
.map(r -> new TracingELResolverWrapper(r))
.collect(Collectors.toList());
}
/**
* Sort the ELResolvers with a custom Comparator provided by the user.
* @param resolvers
* @since 1.2.10, 2.0.2
*/
protected void sortELResolvers(List resolvers)
{
if (runtimeConfig.getELResolverComparator() != null)
{
try
{
// sort the resolvers
Collections.sort(resolvers, runtimeConfig.getELResolverComparator());
if (log.isLoggable(Level.INFO))
{
log.log(Level.INFO, "Chain of EL resolvers sorted with: {0} and the result order is {1}",
new Object [] { runtimeConfig.getELResolverComparator(), resolvers});
}
}
catch (Exception e)
{
log.log(Level.WARNING,
"Could not sort ELResolvers with custom Comparator", e);
}
}
else
{
if (log.isLoggable(Level.INFO))
{
log.log(Level.INFO, "Chain of EL resolvers: {0}", new Object [] { resolvers });
}
}
}
/**
* Filters the ELResolvers with a custom Predicate provided by the user.
* @param resolvers list of ELResolvers
* @return Iterable instance of Iterable containing filtered ELResolvers
*/
protected Iterable filterELResolvers(List resolvers)
{
Predicate predicate = runtimeConfig.getELResolverPredicate();
if (predicate != null)
{
try
{
// filter the resolvers
resolvers.removeIf(elResolver -> !predicate.test(elResolver));
if (log.isLoggable(Level.INFO))
{
log.log(Level.INFO, "Chain of EL resolvers filtered with: {1} and the result is {2}",
new Object [] {predicate, resolvers});
}
}
catch (Exception e)
{
log.log(Level.WARNING,
"Could not filter ELResolvers with custom Predicate", e);
}
}
return resolvers;
}
protected boolean isReplaceImplicitObjectResolverWithCDIResolver(FacesContext facesContext)
{
if (!ExternalSpecifications.isCDIAvailable(facesContext.getExternalContext()))
{
return false;
}
BeanManager beanManager = CDIUtils.getBeanManager(facesContext);
if (beanManager == null)
{
return false;
}
return true;
}
public void build(CompositeELResolver elResolver)
{
build(FacesContext.getCurrentInstance(), elResolver);
}
public void build(FacesContext facesContext, CompositeELResolver elResolver)
{
}
}