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NoValue.java
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NoValue.java
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/*
* Copyright (c) 2002-2017 "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 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.values.storable;
import org.neo4j.values.AnyValue;
/**
* Not a value.
*
* The NULL object of the Value world. Is implemented as a singleton, to allow direct reference equality checks (==),
* and avoid unnecessary object creation.
*/
final class NoValue extends Value
{
@SuppressWarnings( "WeakerAccess" )
static final NoValue NO_VALUE = new NoValue();
private NoValue()
{
}
@Override
public boolean eq( Object other )
{
return this == other;
}
@Override
public Boolean ternaryEquals( AnyValue other )
{
return null;
}
@Override
public int computeHash()
{
return System.identityHashCode( this );
}
@Override
public boolean equals( Value other )
{
return this == other;
}
@Override
public boolean equals( byte[] x )
{
return false;
}
@Override
public boolean equals( short[] x )
{
return false;
}
@Override
public boolean equals( int[] x )
{
return false;
}
@Override
public boolean equals( long[] x )
{
return false;
}
@Override
public boolean equals( float[] x )
{
return false;
}
@Override
public boolean equals( double[] x )
{
return false;
}
@Override
public boolean equals( boolean x )
{
return false;
}
@Override
public boolean equals( boolean[] x )
{
return false;
}
@Override
public boolean equals( char x )
{
return false;
}
@Override
public boolean equals( String x )
{
return false;
}
@Override
public boolean equals( char[] x )
{
return false;
}
@Override
public boolean equals( String[] x )
{
return false;
}
@Override
public <E extends Exception> void writeTo( ValueWriter<E> writer ) throws E
{
writer.writeNull();
}
@Override
public Object asObjectCopy()
{
return null;
}
@Override
public String toString()
{
return prettyPrint();
}
@Override
public String prettyPrint()
{
return "NO_VALUE";
}
public ValueGroup valueGroup()
{
return ValueGroup.NO_VALUE;
}
@Override
public NumberType numberType()
{
return NumberType.NO_NUMBER;
}
}