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package com.sun.faces.scripting.groovy;

import java.beans.FeatureDescriptor;
import java.util.Iterator;

import javax.el.ELContext;
import javax.el.ELResolver;
import javax.faces.FacesException;

/**
 * Proxy instance for a groovy-based ELResolvers.  This allows the ELResolver
 * to remain registered in the application while picking up changes at runtime
 * from the associated groovy script.
 */
public class ELResolverProxy extends ELResolver {

    private String scriptName;



    // ------------------------------------------------------------ Constructors


    public ELResolverProxy(String scriptName) {
        this.scriptName = scriptName;
    }

    // ------------------------------------------------- Methods from ELResolver


    public Object getValue(ELContext elContext, Object o, Object o1) {
        return getGroovyDelegate().getValue(elContext, o, o1);
    }

    public Class getType(ELContext elContext, Object o, Object o1) {
        return getGroovyDelegate().getType(elContext, o, o1);
    }

    public void setValue(ELContext elContext, Object o, Object o1, Object o2) {
        getGroovyDelegate().setValue(elContext, o, o1, o2);
    }

    public boolean isReadOnly(ELContext elContext, Object o, Object o1) {
        return getGroovyDelegate().isReadOnly(elContext, o, o1);
    }

    public Iterator getFeatureDescriptors(ELContext elContext,
                                                             Object o) {
        return getGroovyDelegate().getFeatureDescriptors(elContext, o);
    }

    public Class getCommonPropertyType(ELContext elContext, Object o) {
        return getGroovyDelegate().getCommonPropertyType(elContext, o);
    }


    // --------------------------------------------------------- Private Methods


   private ELResolver getGroovyDelegate() {

       try {
            return ((ELResolver) GroovyHelper.newInstance(scriptName));
       } catch (Exception e) {
           throw new FacesException(e);
       }

    }
}