/*************************************************************************
* Copyright 2009-2013 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
* Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
* CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
* additional information or have any questions.
************************************************************************/
package com.eucalyptus.util;
import java.text.ParseException;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import com.eucalyptus.records.Logs;
import com.google.common.collect.ImmutableMap;
/**
* Utility for parsing time intervals (a.k.a. durations)
*/
public class Intervals {
private static final Pattern intervalPattern = Pattern.compile( "(\\d+)(d|h|m|s|ms)?" );
private static final Map<String,TimeUnit> units = ImmutableMap.<String,TimeUnit>builder()
.put( "d", TimeUnit.DAYS )
.put( "h", TimeUnit.HOURS )
.put( "m", TimeUnit.MINUTES )
.put( "s", TimeUnit.SECONDS )
.put( "ms", TimeUnit.MILLISECONDS )
.build();
public static long parse( @Nonnull final String value ) throws ParseException {
return parse( value, TimeUnit.MILLISECONDS );
}
public static long parse( @Nullable final String value,
final long defaultValue ) {
if ( value != null ) try {
return parse( value, TimeUnit.MILLISECONDS );
} catch ( ParseException e ) {
Logs.exhaust().debug( e, e );
}
return defaultValue;
}
public static long parse( @Nonnull final String value,
@Nonnull final TimeUnit defaultUnit ) throws ParseException {
final String valueToParse = value.toLowerCase().trim();
final Matcher matcher = intervalPattern.matcher( valueToParse );
if ( matcher.matches() ) {
final TimeUnit unit = matcher.group( 2 ) != null ?
units.get( matcher.group( 2 ) ) :
defaultUnit;
try {
return unit.toMillis( Long.parseLong( matcher.group( 1 ) ) );
} catch ( NumberFormatException nfe ) {
throw new ParseException( "Invalid interval: " + value, 0 );
}
} else {
throw new ParseException( "Invalid interval: " + value, 0 );
}
}
public static long parse( @Nullable final String value,
@Nonnull final TimeUnit defaultUnit,
final long defaultValue ) {
if ( value != null ) try {
return parse( value, defaultUnit );
} catch ( ParseException e ) {
Logs.exhaust().debug( e, e );
}
return defaultValue;
}
}