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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 javax.servlet.jsp;

import javax.el.ELContextListener;
import javax.el.ELResolver;
import javax.el.ExpressionFactory;

/**
 * 
 * Stores application-scoped information for the JSP container.
 * 
 *
 * @since 2.1
 */
public interface JspApplicationContext {

    /**
     * Registers an ELContextListener that will be notified
     * whenever a new ELContext is created.
     * 
     * At the very least, any ELContext instantiated will have
     * reference to the JspContext under
     * JspContext.class.
     *
     * @param listener The listener to add
     */
    public void addELContextListener(ELContextListener listener);

    /**
     * 

     * Adds an ELResolver to the chain of EL variable and property
     * management within JSP pages and Tag files.
     * 
     * 
     * JSP has a default set of ELResolvers to chain for all EL evaluation:
     * 
     * 
     * ImplicitObjectELResolver
     * ELResolver instances registered with this method
     * MapELResolver
     * ListELResolver
     * ArrayELResolver
     * BeanELResolver
     * ScopedAttributeELResolver
     * 
     *
     * @param resolver
     *            an additional resolver
     * @throws IllegalStateException
     *             if called after the application's
     *             ServletContextListeners have been initialized.
     */
    public void addELResolver(ELResolver resolver) throws IllegalStateException;

    /**
     * 
     * Returns the JSP container's ExpressionFactory implementation
     * for EL use.
     * 
     *
     * @return an ExpressionFactory implementation
     */
    public ExpressionFactory getExpressionFactory();

}