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CountScale.java
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package act.metric;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* 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.
* #L%
*/
import org.osgl.util.E;
import org.osgl.util.S;
enum CountScale {
nil("", 1L),
kilo("k", 1000L),
million("m", 1000L * 1000L),
billion("b", 1000L * 1000L * 1000L),
tera("t", 1000L * 1000L * 1000L * 1000L),
peta("p", 1000L * 1000L * 1000L * 1000L * 1000L),
exa("e", 1000L * 1000L * 1000L * 1000L * 1000L * 1000L)
;
long value;
String suffix;
CountScale(long value) {
this.value = value;
}
CountScale(String suffix, long value) {
this.value = value;
this.suffix = suffix;
}
public static String format(long count) {
E.illegalArgumentIf(count < 0, "counts cannot be negative number");
if (count == 0) {
return "0";
}
CountScale last = CountScale.exa;
for (CountScale s : CountScale.values()) {
if (s.value <= count) {
last = s;
} else {
break;
}
}
if (last == nil) {
return S.string(count);
}
long l = count / (last.value / 100L);
String s = S.str(l).insert(-2, '.').toString();
if (s.endsWith(".00")) {
s = s.substring(0, s.length() - 3);
}
return S.fmt("%s%s", s, last.suffix());
}
private String suffix() {
String suffix = this.suffix;
if (null == suffix) {
suffix = this.name();
}
return suffix;
}
}