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A library that offers data structures allocated off the java heap.
/*
* Copyright 2015 Terracotta, Inc., a Software AG company.
*
* 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 org.terracotta.offheapstore.util;
/**
*
* @author Chris Dennis
*/
public final class DebuggingUtils {
private static final String[] BASE_10_SUFFIXES = new String[] { "", "k", "M", "G", "T", "P", "E" };
//Also use the non i syntax to refer to base 2 as generally accepted. See http://en.wikipedia.org/wiki/Gigabyte
private static final String[] BASE_2_SUFFIXES = new String[] { "", "K", "M", "G", "T", "P", "E" };
private static final long[] BASE_10_DIVISORS = new long[BASE_10_SUFFIXES.length];
static {
for (int i = 0; i < BASE_10_DIVISORS.length; i++) {
long n = 1;
for (int j = 0; j < i; j++) {
n *= 1000;
}
BASE_10_DIVISORS[i] = n;
}
}
public static String toBase2SuffixedString(long n) {
if (n > 0 && Long.bitCount(n) == 1) {
int i = Long.numberOfTrailingZeros(Math.abs(n)) / 10;
return (n >> (i * 10)) + BASE_2_SUFFIXES[i];
} else {
int i = (63 - Long.numberOfLeadingZeros(n)) / 10;
long factor = 1L << (i * 10);
long leading = n / factor;
long decimalFactor = factor / 10;
if (decimalFactor == 0) {
return leading + BASE_2_SUFFIXES[i];
} else {
long decimal = (n - (leading * factor)) / (factor / 10);
return leading + "." + decimal + BASE_2_SUFFIXES[i];
}
}
}
public static String toBase10SuffixedString(long n) {
for (int i = 0; i < BASE_10_SUFFIXES.length; i++) {
long d = (n / 1000) / BASE_10_DIVISORS[i];
if (d == 0) {
return (n / BASE_10_DIVISORS[i]) + BASE_10_SUFFIXES[i];
}
}
throw new AssertionError();
}
private DebuggingUtils() {
//
}
}
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