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package org.apache.jasper.runtime;

/**
 * Implements javax.servlet.jsp.JspApplication
 */

import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Collections;

import javax.servlet.ServletContext;
import javax.servlet.jsp.JspApplicationContext;

import javax.el.ELException;
import javax.el.ELResolver;
import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.ELContextListener;
import javax.el.ELContextEvent;

import org.apache.jasper.Constants;

public class JspApplicationContextImpl implements JspApplicationContext {

    public JspApplicationContextImpl(ServletContext context) {
        this.context = context;
    }

    public void addELResolver(ELResolver resolver) {
        if ("true".equals(context.getAttribute(Constants.FIRST_REQUEST_SEEN))) {
            throw new IllegalStateException("Attempt to invoke addELResolver "
                + "after the application has already received a request");
        }

        elResolvers.add(0, resolver);
    }

    public ExpressionFactory getExpressionFactory() {
        if (expressionFactory == null) {
            expressionFactory = ExpressionFactory.newInstance();
        }
        return expressionFactory;
    }

    public void addELContextListener(ELContextListener listener) {
        listeners.add(listener);
    }

    protected ELContext createELContext(ELResolver resolver) {

        ELContext elContext = new ELContextImpl(resolver);

        // Notify the listeners
        Iterator iter = listeners.iterator();
        while (iter.hasNext()) {
            ELContextListener elcl = iter.next();
            elcl.contextCreated(new ELContextEvent(elContext));
        }
        return elContext;
    }

    protected static JspApplicationContextImpl findJspApplicationContext(ServletContext context) {

        JspApplicationContextImpl jaContext = map.get(context);
        if (jaContext == null) {
            jaContext = new JspApplicationContextImpl(context);
            map.put(context, jaContext);
        }
        return jaContext;
    }

    public static void removeJspApplicationContext(ServletContext context) {
        map.remove(context);
    }

    protected Iterator getELResolvers() {
        return elResolvers.iterator();
    }

    private static Map map =
            Collections.synchronizedMap(
                new HashMap());

    private ArrayList elResolvers = new ArrayList();
    private ArrayList listeners =
            new ArrayList();
    private ServletContext context;
    private ExpressionFactory expressionFactory;
}