org.apache.pulsar.common.util.NumberFormat Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.pulsar.common.util;
import org.apache.pulsar.shade.io.netty.buffer.ByteBuf;
/**
* Custom number formatter for {@code io.netty.buffer.ByteBuf}.
*/
public class NumberFormat {
static void format(ByteBuf out, long num) {
if (num == 0) {
out.writeByte('0');
return;
}
// Long.MIN_VALUE needs special handling since abs(Long.MIN_VALUE) = abs(Long.MAX_VALUE) + 1
boolean encounteredMinValue = (num == Long.MIN_VALUE);
if (num < 0) {
out.writeByte('-');
num += encounteredMinValue ? 1 : 0;
num *= -1;
}
// Putting the number in bytebuf in reverse order
int start = out.writerIndex();
formatHelper(out, num);
int end = out.writerIndex();
if (encounteredMinValue) {
out.setByte(start, out.getByte(start) + 1);
}
// Reversing the digits
end--;
for (int i = 0; i <= (end - start) / 2; i++) {
byte tmp = out.getByte(end - i);
out.setByte(end - i, out.getByte(start + i));
out.setByte(start + i, tmp);
}
}
static void formatHelper(ByteBuf out, long num) {
while (num != 0) {
out.writeByte((int) ('0' + num % 10));
num /= 10;
}
}
}