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package com.sun.faces.scripting.groovy;

import java.io.IOException;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.ConverterException;
import javax.faces.render.Renderer;
import javax.faces.FacesException;

/**
 * Proxy instance for a groovy-based Renderers.  This allows the Renderer
 * to remain registered with the renderkit while picking up changes at runtime
 * from the associated groovy script.
 */
public class RendererProxy extends Renderer {

    private String scriptName;


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


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


    // --------------------------------------------------- Methods from Renderer


    @Override
    public void decode(FacesContext context, UIComponent component) {
        getGroovyDelegate().decode(context, component);
    }

    @Override
    public void encodeBegin(FacesContext context, UIComponent component)
    throws IOException {
        getGroovyDelegate().encodeBegin(context, component);
    }

    @Override
    public void encodeChildren(FacesContext context, UIComponent component)
    throws IOException {
        getGroovyDelegate().encodeChildren(context, component);
    }

    @Override
    public void encodeEnd(FacesContext context, UIComponent component)
    throws IOException {
        getGroovyDelegate().encodeEnd(context, component);
    }

    @Override
    public String convertClientId(FacesContext context, String clientId) {
        return getGroovyDelegate().convertClientId(context, clientId);
    }

    @Override
    public boolean getRendersChildren() {
        return getGroovyDelegate().getRendersChildren();
    }

    @Override
    public Object getConvertedValue(FacesContext context,
                                    UIComponent component,
                                    Object submittedValue)
    throws ConverterException {
        return getGroovyDelegate().getConvertedValue(context, component, submittedValue);
    }


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


    private Renderer getGroovyDelegate() {

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

    }
}