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MiscUtil.java
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MiscUtil.java
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/*
* Copyright 2015-2017 Austin Keener & Michael Ritter
*
* 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.
*/
package net.dv8tion.jda.core.utils;
import net.dv8tion.jda.core.entities.impl.JDAImpl;
import java.lang.reflect.Method;
import java.time.OffsetDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;
import java.util.TimeZone;
public class MiscUtil
{
public static final long DISCORD_EPOCH = 1420070400000L;
public static final long TIMESTAMP_OFFSET = 22;
private static final DateTimeFormatter dtFormatter = DateTimeFormatter.RFC_1123_DATE_TIME;
/**
* Gets the creation-time of a JDA-entity by doing the reverse snowflake algorithm on its id.
* This returns the creation-time of the actual entity on Discords side, not inside JDA.
*
* @param entityId
* The id of the JDA entity where the creation-time should be determined for
*
* @return The creation time of the JDA entity as OffsetDateTime
*/
public static OffsetDateTime getCreationTime(String entityId) {
try
{
long timestamp = ((Long.parseLong(entityId) >> TIMESTAMP_OFFSET) + DISCORD_EPOCH);
Calendar gmt = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
gmt.setTimeInMillis(timestamp);
return OffsetDateTime.ofInstant(gmt.toInstant(), gmt.getTimeZone().toZoneId());
}
catch (NumberFormatException ex)
{
return null;
}
}
/**
* Gets the creation-time of a JDA-entity by doing the reverse snowflake algorithm on its id.
* This returns the creation-time of the actual entity on Discords side, not inside JDA.
* This will not work on entities, that do not have a getId() method and will return null in those cases!
*
* @param entity
* The JDA entity where the creation-time should be determined for
*
* @return The creation time of the JDA entity as OffsetDateTime
*/
public static OffsetDateTime getCreationTime(Object entity)
{
try {
Method idMethod = entity.getClass().getMethod("getId");
if(idMethod.getReturnType() != String.class)
{
JDAImpl.LOG.warn("Tried to look up creation-time for entity of class " + entity.getClass().getName() + " which doesn't have the correct id getter");
return null;
}
String objId = (String) idMethod.invoke(entity);
return getCreationTime(objId);
} catch(Exception e)
{
JDAImpl.LOG.warn("Tried to look up creation-time for entity of class " + entity.getClass().getName() + " which doesn't have the correct id getter");
return null;
}
}
/**
* Returns a prettier String-representation of a OffsetDateTime object
*
* @param time
* The OffsetDateTime object to format
*
* @return The String of the formatted OffsetDateTime
*/
public static String getDateTimeString(OffsetDateTime time)
{
return time.format(dtFormatter);
}
}