/*
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* Copyright 2011 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit.utils;
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import java.text.DecimalFormat;
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import java.text.FieldPosition;
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import java.text.Format;
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import java.text.ParsePosition;
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/**
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* A formatter for formatting byte sizes. For example, formatting 12345 byes
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* results in "12.1 K" and 1234567 results in "1.18 MB".
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*
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*/
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public class ByteFormat extends Format {
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private static final long serialVersionUID = 1L;
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public ByteFormat() {
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}
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/**
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* Formats a long which represent a number of bytes.
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*/
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public String format(long bytes) {
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return format(Long.valueOf(bytes));
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}
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/**
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* Formats a long which represent a number of kilobytes.
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*/
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public String formatKB(long kilobytes) {
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return format(Long.valueOf(kilobytes * 1024));
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}
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/**
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* Format the given object (must be a Long).
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*
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* @param obj
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* assumed to be the number of bytes as a Long.
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* @param buf
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* the StringBuffer to append to.
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* @param pos
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* @return A formatted string representing the given bytes in more
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* human-readable form.
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*/
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public StringBuffer format(Object obj, StringBuffer buf, FieldPosition pos) {
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if (obj instanceof Long) {
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long numBytes = ((Long) obj).longValue();
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if (numBytes < 1024) {
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DecimalFormat formatter = new DecimalFormat("#,##0");
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buf.append(formatter.format((double) numBytes)).append(" b");
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} else if (numBytes < 1024 * 1024) {
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DecimalFormat formatter = new DecimalFormat("#,##0.0");
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buf.append(formatter.format((double) numBytes / 1024.0)).append(" KB");
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} else if (numBytes < 1024 * 1024 * 1024) {
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DecimalFormat formatter = new DecimalFormat("#,##0.0");
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buf.append(formatter.format((double) numBytes / (1024.0 * 1024.0))).append(" MB");
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} else {
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DecimalFormat formatter = new DecimalFormat("#,##0.0");
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buf.append(formatter.format((double) numBytes / (1024.0 * 1024.0 * 1024.0)))
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.append(" GB");
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}
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}
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return buf;
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}
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/**
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* In this implementation, returns null always.
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*
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* @param source
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* @param pos
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* @return returns null in this implementation.
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*/
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public Object parseObject(String source, ParsePosition pos) {
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return null;
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}
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}
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