Java Size Format formatSize(long size, boolean forceFixLen, boolean forceSizeInBytes)

Description

format Size

License

Open Source License

Declaration

public static String formatSize(long size, boolean forceFixLen,
            boolean forceSizeInBytes) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.text.*;

public class Main {
    private static DecimalFormat decFmtFix1 = null;
    private static DecimalFormat decFmtMax1 = null;
    private static NumberFormat intFmt = null;

    public static String formatSize(long size, boolean forceFixLen,
            boolean forceSizeInBytes) {
        StringBuilder buf = new StringBuilder(64);
        appendSizeText(buf, size, forceFixLen, forceSizeInBytes);
        return buf.toString();
    }/*from  w ww  .j a v  a  2 s  . c  o  m*/

    public static void appendSizeText(StringBuilder buf, long size,
            boolean forceFixLen, boolean forceSizeInBytes) {
        DecimalFormat decFmt = forceFixLen ? getDecimalFormatFix1()
                : getDecimalFormatMax1();
        final long kb = 1024L;
        final long mb = kb * 1024L;
        final long gb = mb * 1024L;
        if (size >= gb) {
            buf.append(decFmt.format((double) size / (double) gb));
            buf.append(" GByte");
        } else if (size >= mb) {
            buf.append(decFmt.format((double) size / (double) mb));
            buf.append(" MByte");
        } else if (size >= kb) {
            buf.append(decFmt.format((double) size / (double) kb));
            buf.append(" KByte");
        }
        if (buf.length() > 0) {
            if (forceSizeInBytes) {
                buf.append(" (");
                buf.append(getIntegerFormat().format(size));
                buf.append(" Bytes");
                buf.append((char) ')');
            }
        } else {
            buf.append(getIntegerFormat().format(size));
            buf.append(" Bytes");
        }
    }

    public static DecimalFormat getDecimalFormatFix1() {
        if (decFmtFix1 == null) {
            NumberFormat numFmt = NumberFormat.getNumberInstance();
            if (numFmt instanceof DecimalFormat) {
                decFmtFix1 = (DecimalFormat) numFmt;
            } else {
                decFmtFix1 = new DecimalFormat();
            }
            decFmtFix1.applyPattern("###,##0.0");
        }
        return decFmtFix1;
    }

    public static DecimalFormat getDecimalFormatMax1() {
        if (decFmtMax1 == null) {
            NumberFormat numFmt = NumberFormat.getNumberInstance();
            if (numFmt instanceof DecimalFormat) {
                decFmtMax1 = (DecimalFormat) numFmt;
            } else {
                decFmtMax1 = new DecimalFormat();
            }
            decFmtMax1.setMaximumFractionDigits(1);
        }
        return decFmtMax1;
    }

    public static NumberFormat getIntegerFormat() {
        if (intFmt == null) {
            intFmt = NumberFormat.getIntegerInstance();
            intFmt.setGroupingUsed(true);
        }
        return intFmt;
    }
}

Related

1. formatSize(long size)
2. formatSize(long size)
3. formatSize(long size)
4. formatSize(long size)
5. formatSize(long size)
6. formatSize(long sizeInByte)
7. formatSize(long sizeInBytes)
8. formatSizeInfo(long size)
9. formatStorageSize(Double size, String label)