GetPropertyRenderer.java

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package com.sun.faces.facelets.tag.jsp;

import java.io.IOException;
import java.util.Map;
import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.FacesRenderer;
import javax.faces.render.Renderer;
import javax.faces.view.facelets.FaceletException;


@FacesRenderer(componentFamily="javax.faces.Output", rendererType="jsp.GetProperty")
public class GetPropertyRenderer extends Renderer {

    @Override
    public void encodeBegin(FacesContext facesContext, UIComponent component) throws IOException {
        Map<String, Object> attrs = component.getAttributes();
        String nameVal = (String) attrs.get("name");
        String propVal = (String) attrs.get("property");
        ELContext elContext = facesContext.getELContext();
        ExpressionFactory ef = facesContext.getApplication().getExpressionFactory();

        // Get the bean
        ValueExpression valExpression = ef.createValueExpression(elContext,
                "#{" + nameVal + "." + propVal + "}", Object.class);
        Object bean = null;
        try {
            bean = valExpression.getValue(elContext);
        } catch (Exception e) {
            throw new FaceletException("Expression " + valExpression.getExpressionString() + " not found.", e);
        }
        ResponseWriter out = facesContext.getResponseWriter();
        out.writeText(bean, component, valExpression.getExpressionString());
    }

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

    @Override
    public boolean getRendersChildren() {
        return true;
    }

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


}