| /* |
| * 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.jasper.runtime; |
| |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import javax.el.CompositeELResolver; |
| import javax.el.ELContext; |
| import javax.el.ELContextEvent; |
| import javax.el.ELContextListener; |
| import javax.el.ELResolver; |
| import javax.el.ExpressionFactory; |
| import javax.servlet.ServletContext; |
| import javax.servlet.jsp.JspApplicationContext; |
| import javax.servlet.jsp.JspContext; |
| |
| import org.apache.jasper.Constants; |
| import org.apache.jasper.el.ELContextImpl; |
| import org.apache.jasper.el.JasperELResolver; |
| |
| /** |
| * Implementation of JspApplicationContext |
| * |
| * @author Jacob Hookom |
| */ |
| public class JspApplicationContextImpl implements JspApplicationContext { |
| |
| private static final String KEY = JspApplicationContextImpl.class.getName(); |
| |
| private final ExpressionFactory expressionFactory = |
| ExpressionFactory.newInstance(); |
| |
| private final List<ELContextListener> contextListeners = new ArrayList<>(); |
| |
| private final List<ELResolver> resolvers = new ArrayList<>(); |
| |
| private boolean instantiated = false; |
| |
| private ELResolver resolver; |
| |
| public JspApplicationContextImpl() { |
| |
| } |
| |
| @Override |
| public void addELContextListener(ELContextListener listener) { |
| if (listener == null) { |
| throw new IllegalArgumentException("ELContextListener was null"); |
| } |
| this.contextListeners.add(listener); |
| } |
| |
| public static JspApplicationContextImpl getInstance(ServletContext context) { |
| if (context == null) { |
| throw new IllegalArgumentException("ServletContext was null"); |
| } |
| JspApplicationContextImpl impl = (JspApplicationContextImpl) context |
| .getAttribute(KEY); |
| if (impl == null) { |
| impl = new JspApplicationContextImpl(); |
| context.setAttribute(KEY, impl); |
| } |
| return impl; |
| } |
| |
| public ELContextImpl createELContext(JspContext context) { |
| if (context == null) { |
| throw new IllegalArgumentException("JspContext was null"); |
| } |
| |
| // create ELContext for JspContext |
| final ELResolver r = this.createELResolver(); |
| ELContextImpl ctx; |
| if (Constants.IS_SECURITY_ENABLED) { |
| ctx = AccessController.doPrivileged( |
| new PrivilegedAction<ELContextImpl>() { |
| @Override |
| public ELContextImpl run() { |
| return new ELContextImpl(r); |
| } |
| }); |
| } else { |
| ctx = new ELContextImpl(r); |
| } |
| ctx.putContext(JspContext.class, context); |
| |
| // alert all ELContextListeners |
| fireListeners(ctx); |
| |
| return ctx; |
| } |
| |
| protected void fireListeners(ELContext elContext) { |
| ELContextEvent event = new ELContextEvent(elContext); |
| for (int i = 0; i < this.contextListeners.size(); i++) { |
| this.contextListeners.get(i).contextCreated(event); |
| } |
| } |
| |
| private ELResolver createELResolver() { |
| this.instantiated = true; |
| if (this.resolver == null) { |
| CompositeELResolver r = new JasperELResolver(this.resolvers, |
| expressionFactory.getStreamELResolver()); |
| this.resolver = r; |
| } |
| return this.resolver; |
| } |
| |
| @Override |
| public void addELResolver(ELResolver resolver) throws IllegalStateException { |
| if (resolver == null) { |
| throw new IllegalArgumentException("ELResolver was null"); |
| } |
| if (this.instantiated) { |
| throw new IllegalStateException( |
| "cannot call addELResolver after the first request has been made"); |
| } |
| this.resolvers.add(resolver); |
| } |
| |
| @Override |
| public ExpressionFactory getExpressionFactory() { |
| return expressionFactory; |
| } |
| |
| } |