com.redhat.lightblue.util.Util Maven / Gradle / Ivy

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/*
 Copyright 2013 Red Hat, Inc. and/or its affiliates.

 This file is part of lightblue.

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program 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 for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see .
 */
package com.redhat.lightblue.util;

public final class Util {

    public static boolean isNumber(String value) {
        if (value != null) {
            int n = value.length();
            for (int i = 0; i < n; i++) {
                char x = value.charAt(i);
                if (!Character.isDigit(x)
                        && !(i == 0 && (x == '-' || x == '+'))) {
                    return false;
                }
            }
            return n > 0;
        }
        return false;
    }

    private Util() {
    }
}