JsfUtil.java

package javaone.con3638.pfscaffolding.jsfs.util;

import java.util.List;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.component.UISelectItem;
import javax.faces.context.FacesContext;

public class JsfUtil {

    public static void addErrorMessage(Exception ex, String defaultMsg) {
        String msg = ex.getLocalizedMessage();
        if (msg != null && msg.length() > 0) {
            addErrorMessage(msg);
        } else {
            addErrorMessage(defaultMsg);
        }
    }

    public static void addErrorMessages(List<String> messages) {
        for (String message : messages) {
            addErrorMessage(message);
        }
    }

    public static void addErrorMessage(String msg) {
        FacesMessage facesMsg = new FacesMessage(FacesMessage.SEVERITY_ERROR, msg, msg);
        FacesContext.getCurrentInstance().addMessage(null, facesMsg);
        FacesContext.getCurrentInstance().validationFailed(); // Invalidate JSF page if we raise an error message

    }

    public static void addSuccessMessage(String msg) {
        FacesMessage facesMsg = new FacesMessage(FacesMessage.SEVERITY_INFO, msg, msg);
        FacesContext.getCurrentInstance().addMessage("successInfo", facesMsg);
    }

    public static Throwable getRootCause(Throwable cause) {
        if (cause != null) {
            Throwable source = cause.getCause();
            if (source != null) {
                return getRootCause(source);
            } else {
                return cause;
            }
        }
        return null;
    }

    public static boolean isValidationFailed() {
        return FacesContext.getCurrentInstance().isValidationFailed();
    }

    public static boolean isDummySelectItem(UIComponent component, String value) {
        for (UIComponent children : component.getChildren()) {
            if (children instanceof UISelectItem) {
                UISelectItem item = (UISelectItem) children;
                if (item.getItemValue() == null && item.getItemLabel().equals(value)) {
                    return true;
                }
                break;
            }
        }
        return false;
    }
}