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LabelSet.java
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LabelSet.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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 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 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/>.
*/
package org.neo4j.internal.kernel.api;
import java.util.NoSuchElementException;
/**
* Set of label ids.
*
* Modifications are not reflected in the LabelSet and there is no guaranteed
* order.
*/
public interface LabelSet
{
int numberOfLabels();
int label( int offset );
boolean contains( int labelToken );
long[] all();
LabelSet NONE = new LabelSet()
{
private final long[] EMPTY = new long[0];
@Override
public int numberOfLabels()
{
return 0;
}
@Override
public int label( int offset )
{
throw new NoSuchElementException();
}
@Override
public boolean contains( int labelToken )
{
return false;
}
@Override
public long[] all()
{
return EMPTY;
}
@Override
public int hashCode()
{
return 1;
}
@Override
public boolean equals( Object obj )
{
if ( obj instanceof LabelSet )
{
return ((LabelSet) obj).numberOfLabels() == 0;
}
return false;
}
};
}