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/*
* Copyright 2012-2020 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.boot.convert;
import java.time.Duration;
import java.time.temporal.ChronoUnit;
import java.util.function.Function;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* Duration format styles.
*
* @author Phillip Webb
* @since 2.0.0
*/
public enum DurationStyle {
/**
* Simple formatting, for example '1s'.
*/
SIMPLE("^([+-]?\\d+)([a-zA-Z]{0,2})$") {
@Override
public Duration parse(String value, ChronoUnit unit) {
try {
Matcher matcher = matcher(value);
Assert.state(matcher.matches(), "Does not match simple duration pattern");
String suffix = matcher.group(2);
return (StringUtils.hasLength(suffix) ? Unit.fromSuffix(suffix) : Unit.fromChronoUnit(unit))
.parse(matcher.group(1));
}
catch (Exception ex) {
throw new IllegalArgumentException("'" + value + "' is not a valid simple duration", ex);
}
}
@Override
public String print(Duration value, ChronoUnit unit) {
return Unit.fromChronoUnit(unit).print(value);
}
},
/**
* ISO-8601 formatting.
*/
ISO8601("^[+-]?P.*$") {
@Override
public Duration parse(String value, ChronoUnit unit) {
try {
return Duration.parse(value);
}
catch (Exception ex) {
throw new IllegalArgumentException("'" + value + "' is not a valid ISO-8601 duration", ex);
}
}
@Override
public String print(Duration value, ChronoUnit unit) {
return value.toString();
}
};
private final Pattern pattern;
DurationStyle(String pattern) {
this.pattern = Pattern.compile(pattern);
}
protected final boolean matches(String value) {
return this.pattern.matcher(value).matches();
}
protected final Matcher matcher(String value) {
return this.pattern.matcher(value);
}
/**
* Parse the given value to a duration.
* @param value the value to parse
* @return a duration
*/
public Duration parse(String value) {
return parse(value, null);
}
/**
* Parse the given value to a duration.
* @param value the value to parse
* @param unit the duration unit to use if the value doesn't specify one ({@code null}
* will default to ms)
* @return a duration
*/
public abstract Duration parse(String value, ChronoUnit unit);
/**
* Print the specified duration.
* @param value the value to print
* @return the printed result
*/
public String print(Duration value) {
return print(value, null);
}
/**
* Print the specified duration using the given unit.
* @param value the value to print
* @param unit the value to use for printing
* @return the printed result
*/
public abstract String print(Duration value, ChronoUnit unit);
/**
* Detect the style then parse the value to return a duration.
* @param value the value to parse
* @return the parsed duration
* @throws IllegalArgumentException if the value is not a known style or cannot be
* parsed
*/
public static Duration detectAndParse(String value) {
return detectAndParse(value, null);
}
/**
* Detect the style then parse the value to return a duration.
* @param value the value to parse
* @param unit the duration unit to use if the value doesn't specify one ({@code null}
* will default to ms)
* @return the parsed duration
* @throws IllegalArgumentException if the value is not a known style or cannot be
* parsed
*/
public static Duration detectAndParse(String value, ChronoUnit unit) {
return detect(value).parse(value, unit);
}
/**
* Detect the style from the given source value.
* @param value the source value
* @return the duration style
* @throws IllegalArgumentException if the value is not a known style
*/
public static DurationStyle detect(String value) {
Assert.notNull(value, "Value must not be null");
for (DurationStyle candidate : values()) {
if (candidate.matches(value)) {
return candidate;
}
}
throw new IllegalArgumentException("'" + value + "' is not a valid duration");
}
/**
* Units that we support.
*/
enum Unit {
/**
* Nanoseconds.
*/
NANOS(ChronoUnit.NANOS, "ns", Duration::toNanos),
/**
* Microseconds.
*/
MICROS(ChronoUnit.MICROS, "us", (duration) -> duration.toMillis() * 1000L),
/**
* Milliseconds.
*/
MILLIS(ChronoUnit.MILLIS, "ms", Duration::toMillis),
/**
* Seconds.
*/
SECONDS(ChronoUnit.SECONDS, "s", Duration::getSeconds),
/**
* Minutes.
*/
MINUTES(ChronoUnit.MINUTES, "m", Duration::toMinutes),
/**
* Hours.
*/
HOURS(ChronoUnit.HOURS, "h", Duration::toHours),
/**
* Days.
*/
DAYS(ChronoUnit.DAYS, "d", Duration::toDays);
private final ChronoUnit chronoUnit;
private final String suffix;
private Function longValue;
Unit(ChronoUnit chronoUnit, String suffix, Function toUnit) {
this.chronoUnit = chronoUnit;
this.suffix = suffix;
this.longValue = toUnit;
}
public Duration parse(String value) {
return Duration.of(Long.parseLong(value), this.chronoUnit);
}
public String print(Duration value) {
return longValue(value) + this.suffix;
}
public long longValue(Duration value) {
return this.longValue.apply(value);
}
public static Unit fromChronoUnit(ChronoUnit chronoUnit) {
if (chronoUnit == null) {
return Unit.MILLIS;
}
for (Unit candidate : values()) {
if (candidate.chronoUnit == chronoUnit) {
return candidate;
}
}
throw new IllegalArgumentException("Unknown unit " + chronoUnit);
}
public static Unit fromSuffix(String suffix) {
for (Unit candidate : values()) {
if (candidate.suffix.equalsIgnoreCase(suffix)) {
return candidate;
}
}
throw new IllegalArgumentException("Unknown unit '" + suffix + "'");
}
}
}
