Java BigInteger Format formatBigInteger(BigInteger bi, int length)

Description

format Big Integer

License

Apache License

Declaration

public static String formatBigInteger(BigInteger bi, int length) 

Method Source Code

//package com.java2s;
/*//  w w  w  . ja  v  a 2  s . com
 * $HeadURL: http://juliusdavies.ca/svn/not-yet-commons-ssl/tags/commons-ssl-0.3.16/src/java/org/apache/commons/ssl/PEMUtil.java $
 * $Revision: 153 $
 * $Date: 2009-09-15 22:40:53 -0700 (Tue, 15 Sep 2009) $
 *
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

import java.math.BigInteger;

public class Main {
    static final String LINE_SEPARATOR = System.getProperty("line.separator");

    public static String formatBigInteger(BigInteger bi, int length) {
        String s = bi.toString(16);
        StringBuffer buf = new StringBuffer(s.length());
        int zeroesToAppend = length - s.length();
        int count = 0;
        buf.append("    ");
        for (int i = 0; i < zeroesToAppend; i++) {
            count++;
            buf.append('0');
            if (i % 2 == 1) {
                buf.append(':');
            }
        }
        for (int i = 0; i < s.length() - 2; i++) {
            count++;
            buf.append(s.charAt(i));
            if (i % 2 == 1) {
                buf.append(':');
            }
            if (count % 30 == 0) {
                buf.append(LINE_SEPARATOR);
                buf.append("    ");
            }
        }
        buf.append(s.substring(s.length() - 2));
        return buf.toString();
    }
}

Related

1. formatBigIntegerBinary(final long value, byte[] buf, final int offset, final int length, final boolean negative)
2. formatSerialNumber(BigInteger bi)
3. formatSerialNumber(final BigInteger serial)
4. formatSize(BigInteger size)