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/*
* Copyright 2011 gitblit.com.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.gitblit.utils;
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".
*
*/
public class ByteFormat extends Format {
private static final long serialVersionUID = 1L;
public ByteFormat() {
}
/**
* Formats a long which represent a number of bytes.
*/
public String format(long bytes) {
return format(Long.valueOf(bytes));
}
/**
* Formats a long which represent a number of kilobytes.
*/
public String formatKB(long kilobytes) {
return format(Long.valueOf(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) {
DecimalFormat formatter = new DecimalFormat("#,##0");
buf.append(formatter.format((double) numBytes)).append(" b");
} else if (numBytes < 1024 * 1024) {
DecimalFormat formatter = new DecimalFormat("#,##0.0");
buf.append(formatter.format((double) numBytes / 1024.0)).append(" KB");
} else if (numBytes < 1024 * 1024 * 1024) {
DecimalFormat formatter = new DecimalFormat("#,##0.0");
buf.append(formatter.format((double) numBytes / (1024.0 * 1024.0))).append(" MB");
} else {
DecimalFormat formatter = new DecimalFormat("#,##0.0");
buf.append(formatter.format((double) numBytes / (1024.0 * 1024.0 * 1024.0)))
.append(" GB");
}
}
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;
}
}
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