org.elasticsearch.common.unit.SizeUnit Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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.elasticsearch.common.unit;
/**
*
*/
public enum SizeUnit {
SINGLE {
@Override
public long toSingles(long size) {
return size;
}
@Override
public long toKilo(long size) {
return size / (C1 / C0);
}
@Override
public long toMega(long size) {
return size / (C2 / C0);
}
@Override
public long toGiga(long size) {
return size / (C3 / C0);
}
},
KILO {
@Override
public long toSingles(long size) {
return x(size, C1 / C0, MAX / (C1 / C0));
}
@Override
public long toKilo(long size) {
return size;
}
@Override
public long toMega(long size) {
return size / (C2 / C1);
}
@Override
public long toGiga(long size) {
return size / (C3 / C1);
}
},
MEGA {
@Override
public long toSingles(long size) {
return x(size, C2 / C0, MAX / (C2 / C0));
}
@Override
public long toKilo(long size) {
return x(size, C2 / C1, MAX / (C2 / C1));
}
@Override
public long toMega(long size) {
return size;
}
@Override
public long toGiga(long size) {
return size / (C3 / C2);
}
},
GIGA {
@Override
public long toSingles(long size) {
return x(size, C3 / C0, MAX / (C3 / C0));
}
@Override
public long toKilo(long size) {
return x(size, C3 / C1, MAX / (C3 / C1));
}
@Override
public long toMega(long size) {
return x(size, C3 / C2, MAX / (C3 / C2));
}
@Override
public long toGiga(long size) {
return size;
}
};
static final long C0 = 1L;
static final long C1 = C0 * 1000L;
static final long C2 = C1 * 1000L;
static final long C3 = C2 * 1000L;
static final long MAX = Long.MAX_VALUE;
/**
* Scale d by m, checking for overflow.
* This has a short name to make above code more readable.
*/
static long x(long d, long m, long over) {
if (d > over) return Long.MAX_VALUE;
if (d < -over) return Long.MIN_VALUE;
return d * m;
}
public long toSingles(long size) {
throw new AbstractMethodError();
}
public long toKilo(long size) {
throw new AbstractMethodError();
}
public long toMega(long size) {
throw new AbstractMethodError();
}
public long toGiga(long size) {
throw new AbstractMethodError();
}
}