/** * $RCSfile$ * $Revision$ * $Date$ * * Copyright (C) 2004 Jive Software. All rights reserved. * * This software is published under the terms of the GNU Public License (GPL), * a copy of which is included in this distribution. */ package org.jivesoftware.util; import java.text.DecimalFormat; import java.text.FieldPosition; import java.text.Format; import java.text.ParsePosition; /** * A formatter for formatting byte sizes. For example, formatting 12345 byes results in * "12.1 K" and 1234567 results in "1.18 MB". * * @author Bill Lynch */ public class ByteFormat extends Format { /** * Formats a long which represent a number of bytes. */ public String format(long bytes) { return format(new Long(bytes)); } /** * Formats a long which represent a number of kilobytes. */ public String formatKB(long kilobytes) { return format(new Long(kilobytes * 1024)); } /** * Format the given object (must be a Long). * * @param obj assumed to be the number of bytes as a Long. * @param buf the StringBuffer to append to. * @param pos * @return A formatted string representing the given bytes in more human-readable form. */ public StringBuffer format(Object obj, StringBuffer buf, FieldPosition pos) { if (obj instanceof Long) { long numBytes = ((Long)obj).longValue(); if (numBytes < 1024 * 1024) { DecimalFormat formatter = new DecimalFormat("#,##0.0"); buf.append(formatter.format((double)numBytes / 1024.0)).append(" K"); } else { DecimalFormat formatter = new DecimalFormat("#,##0.0"); buf.append(formatter.format((double)numBytes / (1024.0 * 1024.0))).append(" MB"); } } return buf; } /** * In this implementation, returns null always. * * @param source * @param pos * @return returns null in this implementation. */ public Object parseObject(String source, ParsePosition pos) { return null; } }