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NonUniqueNumberKey.java
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NonUniqueNumberKey.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.kernel.impl.index.schema;
import org.neo4j.values.Value;
/**
* Includes comparison value and entity id (to be able to handle non-unique values).
* Comparison value is basically any number as a double, a conversion which is lossy by nature,
* especially for higher decimal values. Actual value is stored in {@link NumberValue}
* for ability to filter accidental coersions directly internally.
*/
class NonUniqueNumberKey implements NumberKey
{
static final int SIZE =
Long.SIZE + /* compare value (double represented by long) */
Long.SIZE; /* entityId */
double value;
long entityId;
@Override
public void from( long entityId, Value[] values )
{
this.value = NumberValueConversion.assertValidSingleNumber( values ).doubleValue();
this.entityId = entityId;
}
@Override
public String propertiesAsString()
{
return String.valueOf( value );
}
@Override
public void initAsLowest()
{
value = Double.NEGATIVE_INFINITY;
entityId = Long.MIN_VALUE;
}
@Override
public void initAsHighest()
{
value = Double.POSITIVE_INFINITY;
entityId = Long.MAX_VALUE;
}
@Override
public String toString()
{
return "compareValue=" + value + ",entityId=" + entityId;
}
}