com.codename1.ui.validation.LengthConstraint Maven / Gradle / Ivy
/*
* Copyright (c) 2012, Codename One and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Codename One designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Codename One through http://www.codenameone.com/ if you
* need additional information or have any questions.
*/
package com.codename1.ui.validation;
/**
* Creates a validation constraint based on minimum input length
*
* @author Shai Almog
*/
public class LengthConstraint implements Constraint {
private int length;
private String errorMessage;
/**
* Creates a new length constraint
* @param length the length of the constraint
* @param errorMessage the default error message if the constraint fails
*/
public LengthConstraint(int length, String errorMessage) {
this.length = length;
this.errorMessage = errorMessage;
}
/**
* Creates a new length constraint
* @param length the length of the constraint
*/
public LengthConstraint(int length) {
this(length, null);
}
/**
* {@inheritDoc}
*/
@Override
public boolean isValid(Object value) {
return value != null && value.toString().length() >= length;
}
/**
* {@inheritDoc}
*/
@Override
public String getDefaultFailMessage() {
if(errorMessage == null) {
if(length == 1) {
return "A value is required";
}
return "Input must be at least " + length + " characters";
}
return errorMessage;
}
}