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MemberId.java
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MemberId.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.coreedge.identity;
import java.io.IOException;
import java.util.Objects;
import java.util.UUID;
import org.neo4j.coreedge.core.state.storage.SafeStateMarshal;
import org.neo4j.storageengine.api.ReadableChannel;
import org.neo4j.storageengine.api.WritableChannel;
import static java.lang.String.format;
public class MemberId
{
private final UUID uuid;
private final String shortName;
public MemberId( UUID uuid )
{
Objects.requireNonNull( uuid );
this.uuid = uuid;
shortName = uuid.toString().substring( 0, 8 );
}
public UUID getUuid()
{
return uuid;
}
@Override
public String toString()
{
return format( "MemberId{%s}", shortName );
}
@Override
public boolean equals( Object o )
{
if ( this == o )
{
return true;
}
if ( o == null || getClass() != o.getClass() )
{
return false;
}
MemberId that = (MemberId) o;
return Objects.equals( uuid, that.uuid );
}
@Override
public int hashCode()
{
return Objects.hash( uuid );
}
/**
* Format:
* ┌──────────────────────────────┐
* │mostSignificantBits 8 bytes│
* │leastSignificantBits 8 bytes│
* └──────────────────────────────┘
*/
public static class Marshal extends SafeStateMarshal<MemberId>
{
@Override
public void marshal( MemberId memberId, WritableChannel channel ) throws IOException
{
if ( memberId == null )
{
channel.put( (byte) 0 );
}
else
{
channel.put( (byte) 1 );
channel.putLong( memberId.uuid.getMostSignificantBits() );
channel.putLong( memberId.uuid.getLeastSignificantBits() );
}
}
@Override
public MemberId unmarshal0( ReadableChannel channel ) throws IOException
{
byte nullMarker = channel.get();
if ( nullMarker == 0 )
{
return null;
}
else
{
long mostSigBits = channel.getLong();
long leastSigBits = channel.getLong();
return new MemberId( new UUID( mostSigBits, leastSigBits ) );
}
}
@Override
public MemberId startState()
{
return null;
}
@Override
public long ordinal( MemberId memberId )
{
return memberId == null ? 0 : 1;
}
}
}