validate Email value from JSF UIComponent - Java JSF

Java examples for JSF:UIComponent

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Description

validate Email value from JSF UIComponent

Demo Code

/*/*from ww w  .ja  v  a2  s .co  m*/
 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions
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import javax.faces.component.UIComponent;
import javax.faces.component.UIInput;
import javax.faces.context.FacesContext;
import javax.faces.application.FacesMessage;

public class Main{
    public static void validateEmail(UIComponent uic, String entry) {

        System.out.println("Email Received: " + entry);
        String field = "Email";

        if (!validateLength(uic, entry, field, 1, 50)) {
            return;
        }

        int lastDot = entry.lastIndexOf('.');
        //last dot must occur and not be the first or last character
        if (lastDot < 1 || lastDot == entry.length() - 1) {
            String message = field + ": Invalid Email";
            invalidateInput((UIInput) uic, message);
            return;
        }

        int at = entry.indexOf('@');
        int lastAt = entry.lastIndexOf('@');
        //@ must occur only once, not be the first character, and be before the last dot
        if (at != lastAt || at < 1 || at > lastDot) {
            String message = field + ": Invalid Email";
            invalidateInput((UIInput) uic, message);
            return;
        }

        //the character immediately before and after the @ must not be a dot
        if (entry.charAt(at - 1) == '.' || entry.charAt(at + 1) == '.') {
            String message = field + " : InvalidEmail";
            invalidateInput((UIInput) uic, message);
            return;
        }

        //spaces are not permitted
        if (entry.indexOf(' ') != -1) {
            String message = field + " : InvalidEmail";
            invalidateInput((UIInput) uic, message);
            return;
        }
    }
    public static boolean validateLength(UIComponent uic, String entry,
            String fieldKey, int min, int max) {

        if (entry.length() < min) {
            String message = fieldKey + " : Value has to be longer than "
                    + min + " characters";
            invalidateInput((UIInput) uic, message);
            return false;
        }

        if (entry.length() > max) {
            String message = fieldKey + " : Value has to be shorter than "
                    + max + " characters";
            invalidateInput((UIInput) uic, message);
            return false;
        }

        return true;
    }
    public static void invalidateInput(UIInput uii, String message) {
        uii.setValid(false);
        FacesContext fc = javax.faces.context.FacesContext
                .getCurrentInstance();
        fc.addMessage(uii.getClientId(fc), new FacesMessage(
                javax.faces.application.FacesMessage.SEVERITY_ERROR,
                message, null));
    }
}

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