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/*
* Copyright 2002-2019 the original author or authors.
*
* 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
*
* https://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.springframework.util.unit;
/**
* A standard set of {@link DataSize} units.
*
* The unit prefixes used in this class are
* binary prefixes
* indicating multiplication by powers of 2. The following table displays the
* enum constants defined in this class and corresponding values.
*
*
*
* Constant Data Size Power of 2 Size in Bytes
* {@link #BYTES} 1B 2^0 1
* {@link #KILOBYTES} 1KB 2^10 1,024
* {@link #MEGABYTES} 1MB 2^20 1,048,576
* {@link #GIGABYTES} 1GB 2^30 1,073,741,824
* {@link #TERABYTES} 1TB 2^40 1,099,511,627,776
*
*
* @author Stephane Nicoll
* @author Sam Brannen
* @since 5.1
* @see DataSize
*/
public enum DataUnit {
/**
* Bytes, represented by suffix {@code B}.
*/
BYTES("B", DataSize.ofBytes(1)),
/**
* Kilobytes, represented by suffix {@code KB}.
*/
KILOBYTES("KB", DataSize.ofKilobytes(1)),
/**
* Megabytes, represented by suffix {@code MB}.
*/
MEGABYTES("MB", DataSize.ofMegabytes(1)),
/**
* Gigabytes, represented by suffix {@code GB}.
*/
GIGABYTES("GB", DataSize.ofGigabytes(1)),
/**
* Terabytes, represented by suffix {@code TB}.
*/
TERABYTES("TB", DataSize.ofTerabytes(1));
private final String suffix;
private final DataSize size;
DataUnit(String suffix, DataSize size) {
this.suffix = suffix;
this.size = size;
}
DataSize size() {
return this.size;
}
/**
* Return the {@link DataUnit} matching the specified {@code suffix}.
* @param suffix one of the standard suffixes
* @return the {@link DataUnit} matching the specified {@code suffix}
* @throws IllegalArgumentException if the suffix does not match the suffix
* of any of this enum's constants
*/
public static DataUnit fromSuffix(String suffix) {
for (DataUnit candidate : values()) {
if (candidate.suffix.equals(suffix)) {
return candidate;
}
}
throw new IllegalArgumentException("Unknown data unit suffix '" + suffix + "'");
}
}