org.apache.pivot.wtk.validation.FloatValidator Maven / Gradle / Ivy
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pivot.wtk.validation;
import java.util.Locale;
/**
* A validator for a float value.
*
* Beware that usual math rules for native primitive types (and related approximations) are applied here.
*
* @see BigDecimalValidator
*/
public class FloatValidator extends DecimalValidator {
public FloatValidator() {
super();
}
public FloatValidator(Locale locale) {
super(locale);
}
@Override
public boolean isValid(String text) {
if (!super.isValid(text)) {
return false;
}
/*
* DecimalFormat will parse the number as a double. Make sure the
* resulting number is within range for a float.
*/
Number number = parseNumber(text);
double doubleValue = number.doubleValue();
if (doubleValue == Double.POSITIVE_INFINITY || doubleValue == Double.NEGATIVE_INFINITY
|| Double.isNaN(doubleValue)) {
return true;
}
doubleValue = Math.abs(doubleValue);
if (doubleValue > Float.MAX_VALUE || doubleValue < Float.MIN_VALUE) {
return false;
}
return true;
}
}