org.apache.rocketmq.shaded.ch.qos.logback.core.util.FileSize Maven / Gradle / Ivy
/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2015, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package org.apache.rocketmq.shaded.ch.qos.logback.core.util;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Instances of this class represent the size of a file. Internally, the size is
* stored as long.>
*
* The {@link #valueOf} method can convert strings such as "3 kb", "5 mb", into
* FileSize instances. The recognized unit specifications for file size are the
* "kb", "mb", and "gb". The unit name may be followed by an "s". Thus, "2 kbs"
* and "2 kb" are equivalent. In the absence of a time unit specification, byte
* is assumed.
*
* @author Ceki Gülcü
*
*/
public class FileSize {
private final static String LENGTH_PART = "([0-9]+)";
private final static int DOUBLE_GROUP = 1;
private final static String UNIT_PART = "(|kb|mb|gb)s?";
private final static int UNIT_GROUP = 2;
private static final Pattern FILE_SIZE_PATTERN = Pattern.compile(LENGTH_PART + "\\s*" + UNIT_PART, Pattern.CASE_INSENSITIVE);
static public final long KB_COEFFICIENT = 1024;
static public final long MB_COEFFICIENT = 1024 * KB_COEFFICIENT;
static public final long GB_COEFFICIENT = 1024 * MB_COEFFICIENT;
final long size;
public FileSize(long size) {
this.size = size;
}
public long getSize() {
return size;
}
static public FileSize valueOf(String fileSizeStr) {
Matcher matcher = FILE_SIZE_PATTERN.matcher(fileSizeStr);
long coefficient;
if (matcher.matches()) {
String lenStr = matcher.group(DOUBLE_GROUP);
String unitStr = matcher.group(UNIT_GROUP);
long lenValue = Long.valueOf(lenStr);
if (unitStr.equalsIgnoreCase("")) {
coefficient = 1;
} else if (unitStr.equalsIgnoreCase("kb")) {
coefficient = KB_COEFFICIENT;
} else if (unitStr.equalsIgnoreCase("mb")) {
coefficient = MB_COEFFICIENT;
} else if (unitStr.equalsIgnoreCase("gb")) {
coefficient = GB_COEFFICIENT;
} else {
throw new IllegalStateException("Unexpected " + unitStr);
}
return new FileSize(lenValue * coefficient);
} else {
throw new IllegalArgumentException("String value [" + fileSizeStr + "] is not in the expected format.");
}
}
@Override
public String toString() {
long inKB = size / KB_COEFFICIENT;
if(inKB == 0)
return size + " Bytes";
long inMB = size / MB_COEFFICIENT;
if(inMB == 0) {
return inKB + " KB";
}
long inGB = size / GB_COEFFICIENT;
if(inGB == 0) {
return inMB + " MB";
}
return inGB + " GB";
}
}