/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source 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 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.config.types;
import com.caucho.config.ConfigException;
import com.caucho.util.L10N;
/**
* Returns a number of bytes, allowing EL expressions. Default is bytes.
*
* <pre>
* b : bytes
* k : kilobytes
* kb : kilobytes
* m : megabytes
* mb : megabytes
* g : gigabytes
* </pre>
*/
public class Bytes {
private static final L10N L = new L10N(Bytes.class);
public static final long BYTE = 1L;
public static final long KILOBYTE = 1024;
public static final long MEGABYTE = 1024 * 1024;
public static final long GIGABYTE = 1024 * 1024 * 1024;
public static final long INFINITE = Long.MAX_VALUE / 2;
private long _bytes;
public Bytes()
{
}
public Bytes(long bytes)
{
_bytes = bytes;
}
/**
* Sets the text.
*/
public void addText(String text)
throws ConfigException
{
_bytes = toBytes(text);
}
/**
* Replace with the real bytes.
*/
public long getBytes()
{
return _bytes;
}
/**
* Converts a byte string to a number of bytes. Default is bytes.
*
* <pre>
* b : bytes
* k : kilobytes
* kb : kilobytes
* m : megabytes
* mb : megabytes
* g : gigabytes
* </pre>
*/
public static long toBytes(String bytes)
throws ConfigException
{
if (bytes == null)
return -1;
long value = 0;
long sign = 1;
int i = 0;
int length = bytes.length();
if (length == 0)
return -1;
if (bytes.charAt(i) == '-') {
sign = -1;
i++;
}
else if (bytes.charAt(i) == '+') {
i++;
}
if (length <= i)
return -1;
int ch;
for (; i < length && (ch = bytes.charAt(i)) >= '0' && ch <= '9'; i++)
value = 10 * value + ch - '0';
value = sign * value;
if (bytes.endsWith("gb") || bytes.endsWith("g") || bytes.endsWith("G")) {
return value * 1024L * 1024L * 1024L;
}
else if (bytes.endsWith("mb") || bytes.endsWith("m") || bytes.endsWith("M")) {
return value * 1024L * 1024L;
}
else if (bytes.endsWith("kb") || bytes.endsWith("k") || bytes.endsWith("K")) {
return value * 1024L;
}
else if (bytes.endsWith("b") || bytes.endsWith("B")) {
return value;
}
else if (value < 0)
return value;
else {
throw new ConfigException(L.l("byte-valued expression `{0}' must have units. '16B' for bytes, '16K' for kilobytes, '16M' for megabytes, '16G' for gigabytes.", bytes));
}
}
}