package beanface.el.functor.testing;

import java.util.Vector;

import javax.el.ArrayELResolver;
import javax.el.BeanELResolver;
import javax.el.CompositeELResolver;
import javax.el.ELContext;
import javax.el.ELResolver;
import javax.el.ListELResolver;
import javax.el.MapELResolver;
import javax.el.ResourceBundleELResolver;

import com.sun.faces.el.ELContextImpl;

public class ELContextFactory
{
    private ELContext elContext;
    private ELResolver elResolver;
    private Vector<ELResolver> extraELResolvers;

    public void addELResolver(ELResolver r)
    {
        if (extraELResolvers == null)
            extraELResolvers = new Vector<ELResolver>();
        extraELResolvers.add(r);
        if (elResolver != null && elResolver instanceof CompositeELResolver)
            ((CompositeELResolver) elResolver).add(r);
    }

    public ELResolver getELResolver()
    {
        if (elResolver == null)
        {
            CompositeELResolver resolver = new CompositeELResolver();
            if (extraELResolvers != null)
            {
                for (ELResolver r : extraELResolvers)
                    resolver.add(r);
            }
            resolver.add(new MapELResolver());
            resolver.add(new ResourceBundleELResolver());
            resolver.add(new ListELResolver());
            resolver.add(new ArrayELResolver());
            resolver.add(new BeanELResolver());
            elResolver = resolver;
        }
        return elResolver;
    }

    public ELContext getELContext()
    {
        if (elContext == null)
        {
            ELContextImpl elContextImpl = new ELContextImpl(getELResolver());
            // elContextImpl.setVariableMapper(new VariableMapperImpl());
            elContext = elContextImpl;
        }
        return elContext;
    }
}