com.codename1.ui.validation.NumericConstraint 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;
/**
* Forces the value to be a number potentially within specific bounds
*
* @author Shai Almog
*/
public class NumericConstraint implements Constraint {
private boolean dec;
private double minimum;
private double maximum;
private String errorMessage;
/**
* Creates a new numeric constraint
* @param dec whether the number is decimal or integer, true for decimal
* @param minimum the minimal value to a number or Double.NaN for no minimum value
* @param maximum the maximum value to a number or Double.NaN for no minimum value
* @param errorMessage the default error message if the constraint fails
*/
public NumericConstraint(boolean dec, double minimum, double maximum, String errorMessage) {
this.dec = dec;
this.minimum = minimum;
this.maximum = maximum;
this.errorMessage = errorMessage;
}
/**
* Creates a new numeric constraint
* @param dec whether the number is decimal or integer, true for decimal
*/
public NumericConstraint(boolean dec) {
this(dec, Integer.MIN_VALUE, Integer.MAX_VALUE, null);
}
/**
* {@inheritDoc}
*/
@Override
public boolean isValid(Object value) {
if(value != null) {
String s = value.toString();
if(!dec) {
try {
return checkRange(Integer.parseInt(s));
} catch(NumberFormatException e) {
return false;
}
}
try {
return checkRange(Double.parseDouble(s));
} catch(NumberFormatException e) {
return false;
}
}
return false;
}
private boolean checkRange(double v) {
if(minimum != Double.NaN) {
if(maximum != Double.NaN) {
return v >= minimum && v <= maximum;
}
return v >= minimum;
} else {
if(maximum != Double.NaN) {
return v <= maximum;
}
}
return true;
}
/**
* {@inheritDoc}
*/
@Override
public String getDefaultFailMessage() {
if(errorMessage == null) {
String round = "";
if(!dec) {
round = "round ";
}
if(minimum != Double.NaN) {
if(maximum != Double.NaN) {
return "The value must be a valid " + round + "number between " + minimum + " and " + maximum;
}
return "The value must be a valid " + round + "number larger than " + minimum;
} else {
if(maximum != Double.NaN) {
return "The value must be a valid " + round + "number larger than " + maximum;
}
}
return "The value must be a valid " + round + "number";
}
return errorMessage;
}
}