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ComparableNativeSchemaKey.java
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ComparableNativeSchemaKey.java
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/*
* Copyright (c) 2002-2018 "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 java.util.Comparator;
/**
* Adds comparability to NativeSchemaKey.
*
* @param <SELF> the type of the concrete implementing subclass
*/
abstract class ComparableNativeSchemaKey<SELF extends ComparableNativeSchemaKey> extends NativeSchemaKey
{
/**
* Compares the value of this key to that of another key.
* This method is expected to be called in scenarios where inconsistent reads may happen (and later retried).
*
* @param other the {@link LocalTimeSchemaKey} to compare to.
* @return comparison against the {@code other} {@link LocalTimeSchemaKey}.
*/
abstract int compareValueTo( SELF other );
static <T extends ComparableNativeSchemaKey<T>> Comparator<T> UNIQUE()
{
return ( o1, o2 ) -> {
int comparison = o1.compareValueTo( o2 );
if ( comparison == 0 )
{
// This is a special case where we need also compare entityId to support inclusive/exclusive
if ( o1.getCompareId() || o2.getCompareId() )
{
return Long.compare( o1.getEntityId(), o2.getEntityId() );
}
}
return comparison;
};
}
static <T extends ComparableNativeSchemaKey<T>> Comparator<T> NON_UNIQUE()
{
return ( o1, o2 ) -> {
int comparison = o1.compareValueTo( o2 );
return comparison != 0 ? comparison : Long.compare( o1.getEntityId(), o2.getEntityId() );
};
}
}