com.examples.with.different.packagename.ClassNumberUtils.java Source code

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Here is the source code for com.examples.with.different.packagename.ClassNumberUtils.java

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/**
 * Copyright (C) 2010-2016 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite 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
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
 */
package com.examples.with.different.packagename;

import java.math.BigInteger;

/**
 * Snippet from Lang project
 * (org.apache.commons.lang3.math.NumberUtils)
 */
public class ClassNumberUtils {

    public static BigInteger createBigInteger(final String str) {
        if (str == null) {
            return null;
        }
        int pos = 0; // offset within string
        int radix = 10;
        boolean negate = false; // need to negate later?
        if (str.startsWith("-")) {
            negate = true;
            pos = 1;
        }
        if (str.startsWith("0x", pos) || str.startsWith("0X", pos)) { // hex
            radix = 16;
            pos += 2;
        } else if (str.startsWith("#", pos)) { // alternative hex (allowed by Long/Integer)
            radix = 16;
            pos++;
        } else if (str.startsWith("0", pos) && str.length() > pos + 1) { // octal; so long as there are additional digits
            radix = 8;
            pos++;
        } // default is to treat as decimal

        final BigInteger value = new BigInteger(str.substring(pos), radix);
        return negate ? value.negate() : value;
    }
}