| /* |
| * 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.resolver; |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| import javax.el.ELContext; |
| import javax.el.ELException; |
| import javax.el.PropertyNotFoundException; |
| |
| import org.apache.myfaces.util.lang.ClassUtils; |
| |
| /** |
| * See JSF 2.2 section 5.6.2.8 |
| */ |
| public class ImportHandlerResolver extends ScopedAttributeResolver |
| { |
| private static final Class EL_CLASS; |
| private static final Constructor EL_CLASS_CONSTRUCTOR; |
| private static final Method GET_IMPORT_HANDLER_METHOD; |
| private static final Method IMPORT_HANDLER_RESOLVE_CLASS_METHOD; |
| |
| static |
| { |
| Class elClass = null; |
| Class importHandlerClass = null; |
| Constructor elClassConstructor = null; |
| Method getImportHandlerMethod = null; |
| Method importHandlerResolveClassMethod = null; |
| try |
| { |
| // These classes will only be available with EL 3+ |
| elClass = ClassUtils.classForName("javax.el.ELClass"); |
| importHandlerClass = ClassUtils.classForName("javax.el.ImportHandler"); |
| getImportHandlerMethod = ELContext.class.getMethod("getImportHandler"); |
| if (elClass != null && importHandlerClass != null) |
| { |
| importHandlerResolveClassMethod = |
| importHandlerClass.getDeclaredMethod("resolveClass", new Class[] {String.class}); |
| elClassConstructor = elClass.getConstructor(Class.class); |
| } |
| } |
| catch (SecurityException | ClassNotFoundException | NoSuchMethodException ex) |
| { |
| //No op |
| } |
| |
| EL_CLASS = elClass; |
| GET_IMPORT_HANDLER_METHOD = getImportHandlerMethod; |
| IMPORT_HANDLER_RESOLVE_CLASS_METHOD = importHandlerResolveClassMethod; |
| EL_CLASS_CONSTRUCTOR = elClassConstructor; |
| } |
| |
| /** |
| * Creates a new instance of ImportHandlerResolver |
| */ |
| public ImportHandlerResolver() |
| { |
| } |
| |
| /* |
| * Handle the EL case for the name of an import class |
| */ |
| @Override |
| public Object getValue(final ELContext context, final Object base, final Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException |
| { |
| if (EL_CLASS == null |
| || EL_CLASS_CONSTRUCTOR == null |
| || GET_IMPORT_HANDLER_METHOD == null |
| || IMPORT_HANDLER_RESOLVE_CLASS_METHOD == null) |
| { |
| return null; |
| } |
| |
| try |
| { |
| // In an EL 3+ environment, the ELContext will have a getImportHandler() method |
| Object importHandler = GET_IMPORT_HANDLER_METHOD.invoke(context); |
| if (importHandler != null) |
| { |
| Class<?> clazz = (Class<?>) IMPORT_HANDLER_RESOLVE_CLASS_METHOD.invoke( |
| importHandler, property.toString()); |
| if (clazz != null) |
| { |
| context.setPropertyResolved(true); |
| return EL_CLASS_CONSTRUCTOR.newInstance(clazz); |
| } |
| } |
| } |
| catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException | SecurityException |
| | InstantiationException ex) |
| { |
| //No op |
| } |
| |
| return null; |
| } |
| } |