1 package edu.jiangxin.apktoolbox.utils;
2
3 import org.apache.logging.log4j.LogManager;
4 import org.apache.logging.log4j.Logger;
5
6 import java.io.File;
7 import java.io.IOException;
8 import java.math.BigDecimal;
9 import java.math.BigInteger;
10
11 public class FileUtils {
12
13 private static final Logger LOGGER = LogManager.getLogger(FileUtils.class.getSimpleName());
14
15 public static final long ONE_KB = 1024;
16
17 public static final BigInteger ONE_KB_BI = BigInteger.valueOf(ONE_KB);
18
19 public static final BigInteger ONE_MB_BI = ONE_KB_BI.multiply(ONE_KB_BI);
20
21 public static final BigInteger ONE_GB_BI = ONE_KB_BI.multiply(ONE_MB_BI);
22
23 public static final BigInteger ONE_TB_BI = ONE_KB_BI.multiply(ONE_GB_BI);
24
25 public static final BigInteger ONE_PB_BI = ONE_KB_BI.multiply(ONE_TB_BI);
26
27 public static final BigInteger ONE_EB_BI = ONE_KB_BI.multiply(ONE_PB_BI);
28
29 public static String sizeOfInHumanFormat(final File file) {
30 BigInteger size = BigInteger.valueOf(file.length());
31 String displaySize;
32
33 if (size.divide(ONE_EB_BI).compareTo(BigInteger.ZERO) > 0) {
34 displaySize = divide(size, ONE_EB_BI) + " EB";
35 } else if (size.divide(ONE_PB_BI).compareTo(BigInteger.ZERO) > 0) {
36 displaySize = divide(size, ONE_PB_BI) + " PB";
37 } else if (size.divide(ONE_TB_BI).compareTo(BigInteger.ZERO) > 0) {
38 displaySize = divide(size, ONE_TB_BI) + " TB";
39 } else if (size.divide(ONE_GB_BI).compareTo(BigInteger.ZERO) > 0) {
40 displaySize = divide(size, ONE_GB_BI) + " GB";
41 } else if (size.divide(ONE_MB_BI).compareTo(BigInteger.ZERO) > 0) {
42 displaySize = divide(size, ONE_MB_BI) + " MB";
43 } else if (size.divide(ONE_KB_BI).compareTo(BigInteger.ZERO) > 0) {
44 displaySize = divide(size, ONE_KB_BI) + " KB";
45 } else {
46 displaySize = size + " bytes";
47 }
48 return displaySize;
49 }
50
51 public static String lastModifiedInHumanFormat(File file) {
52 long lastModified = file.lastModified();
53 return DateUtils.millisecondToHumanFormat(lastModified);
54 }
55
56 public static double divide(BigInteger size, BigInteger one_bi) {
57 BigDecimal decimalSize = BigDecimal.valueOf(size.doubleValue())
58 .divide(BigDecimal.valueOf(one_bi.doubleValue()), 2, BigDecimal.ROUND_HALF_UP);
59 return decimalSize.doubleValue();
60 }
61
62 public static String getCanonicalPathQuiet(File file) {
63 if (file == null) {
64 LOGGER.warn("getCanonicalPathQuiet failed: file is null");
65 return null;
66 }
67 try {
68 return file.getCanonicalPath();
69 } catch (IOException e) {
70 LOGGER.error("getCanonicalPathQuiet failed: IOException");
71 return null;
72 }
73 }
74 }
75
76