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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.jasper.runtime;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.List;
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.compiler.Localizer;
import org.apache.jasper.el.ELContextImpl;
import org.apache.jasper.el.JasperELResolver;
/**
* Implementation of JspApplicationContext.
*/
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(Localizer.getMessage("jsp.error.nullArgument"));
}
this.contextListeners.add(listener);
}
public static JspApplicationContextImpl getInstance(ServletContext context) {
if (context == null) {
throw new IllegalArgumentException(Localizer.getMessage("jsp.error.nullArgument"));
}
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(Localizer.getMessage("jsp.error.nullArgument"));
}
// create ELContext for JspContext
final ELResolver r = this.createELResolver();
ELContextImpl ctx;
if (Constants.IS_SECURITY_ENABLED) {
ctx = AccessController.doPrivileged((PrivilegedAction<ELContextImpl>) () -> 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 (ELContextListener contextListener : this.contextListeners) {
contextListener.contextCreated(event);
}
}
private ELResolver createELResolver() {
this.instantiated = true;
if (this.resolver == null) {
this.resolver = new JasperELResolver(this.resolvers, expressionFactory.getStreamELResolver());
}
return this.resolver;
}
@Override
public void addELResolver(ELResolver resolver) throws IllegalStateException {
if (resolver == null) {
throw new IllegalArgumentException(Localizer.getMessage("jsp.error.nullArgument"));
}
if (this.instantiated) {
throw new IllegalStateException(Localizer.getMessage("jsp.error.cannotAddResolver"));
}
this.resolvers.add(resolver);
}
@Override
public ExpressionFactory getExpressionFactory() {
return expressionFactory;
}
}
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