[OmniFaces utilities 2.0/2.4] Format the given bytes to nearest 10^n with IEC binary unit (KiB, MiB, etc)

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[OmniFaces utilities] The formatBytes() function formats the given bytes to nearest 10ⁿ with IEC binary unit (KiB, MiB, etc) with rounding precision of 1 fraction. For example:

• 1023 bytes will appear as 1023 B
• 1024 bytes will appear as 1.0 KiB
• 500000 bytes will appear as 488.3 KiB
• 1048576 bytes will appear as 1.0 MiB

. The format locale will be set to the one as obtained by Faces#getLocale().

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Function:

OmniFaces 2.4	OmniFaces 2.0

See also: Faces#getLocale()

Usage:

Let's suppose that we have a map that contains several files names and their sizes in bytes, as below:

// in real cases, you may loop a folder to extract the files

private final Map<Long, String> fileMap

         = Collections.unmodifiableMap(new HashMap<Long, String>() {

 {

  put(13523424L, "flowers.png");

  put(2343L, "script.txt");

  put(343L, "Demo.java");

  put(4565652L, "paint.jpg");

  put(1024L, "fire.jpg");

 }

});

public Map<Long, String> getFileMap() {

 return fileMap;

}

Now, we can display a table containing these files names and sizes. The sizes are formatted via of:formatBytes():

<h:dataTable value="#{fileBean.fileMap.entrySet()}" var="file">

 <h:column>

  <f:facet name="header">File</f:facet>

  #{file.value}

 </h:column>

 <h:column>

  <f:facet name="header">Size</f:facet>

  #{of:formatBytes(file.key)}

 </h:column>

</h:dataTable>

Output:

API GH GH2.4