stringutil.java

一个非常好的ssh客户端实现

/******************************************************************************
 *
 * Copyright (c) 1999-2003 AppGate Network Security AB. All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code as
 * defined in and that are subject to the MindTerm Public Source License,
 * Version 2.0, (the 'License'). You may not use this file except in compliance
 * with the License.
 * 
 * You should have received a copy of the MindTerm Public Source License
 * along with this software; see the file LICENSE.  If not, write to
 * AppGate Network Security AB, Otterhallegatan 2, SE-41118 Goteborg, SWEDEN
 *
 *****************************************************************************/

package com.mindbright.util;

public final class StringUtil {

    static final String[] byteUnits = { "Bytes", "kB", "MB", "GB", "TB" };

    public static String trimLeft(String str) {
	char[] val = str.toCharArray();
	int st = 0;
	while ((st < val.length) && (val[st] <= ' ')) {
	    st++;
	}
	return str.substring(st);
    }

    public static String trimRight(String str) {
	char[] val = str.toCharArray();
	int    end = val.length;
	while ((end > 0) && (val[end - 1] <= ' ')) {
	    end--;
	}
	return str.substring(0, end);
    }

    public static String nBytesToString(long nBytes, int digits) {
	int ix = 0;
	int thresh = 10;
	while(--digits > 0) {
	    thresh *= 10;
	}
	while(nBytes >= thresh) {
	    ix++;
	    nBytes >>>= 10;
	}
	return nBytes + " " + byteUnits[ix];
    }

}