FormRenderer.java

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package j2meDemo.renderkit;

import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.component.UIForm;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;

import java.io.IOException;
import java.net.URLEncoder;
import java.util.Iterator;
import java.util.Map;

public class FormRenderer extends Renderer {
    public void encodeBegin(FacesContext context,
                            UIComponent component) throws IOException {
        ResponseWriter writer = context.getResponseWriter();
        writer.write("form=" + component.getId() + "\n");

        Iterator ids = context.getClientIdsWithMessages();
        while (ids.hasNext()) {
            String id = (String) ids.next();
            Iterator messages = context.getMessages(id);
            String msg = null;
            while (messages.hasNext()) {
                FacesMessage m = (FacesMessage) messages.next();
                if (msg == null) {
                    msg = m.getSummary();
                } else {
                    msg = msg + "," + m.getSummary();
                }
            }
            if (msg != null) {
                writer.write("messages");
                if (id != null) {
                    writer.write("." + id);
                }
                writer.write("=" + URLEncoder.encode(msg, "UTF8") + "\n");
            }
        }
    }

    public void decode(FacesContext context, UIComponent component) {
        Map map = context.getExternalContext().getRequestParameterMap();
        ((UIForm) component).setSubmitted(
              component.getId().equals(map.get("form")));
    }
}