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IndexReference.java
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IndexReference.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.internal.kernel.api;
import java.util.Iterator;
import java.util.List;
import org.neo4j.helpers.collection.Iterators;
import org.neo4j.internal.kernel.api.schema.SchemaUtil;
import static java.lang.String.format;
/**
* Reference to a specific index. This reference is valid until the schema of the database changes (that is a
* create/drop of an index or constraint occurs).
*/
public interface IndexReference
{
boolean isUnique();
int label();
int[] properties();
/**
* @param tokenNameLookup used for looking up names for token ids.
* @return a user friendly description of what this index indexes.
*/
default String userDescription( TokenNameLookup tokenNameLookup )
{
String type = isUnique() ? "UNIQUE" : "GENERAL";
return format( "Index( %s, %s )", type, SchemaUtil.niceProperties( tokenNameLookup, properties() ) );
}
/**
* Sorts indexes by type, returning first GENERAL indexes, followed by UNIQUE. Implementation is not suitable in
* hot path.
*
* @param indexes Indexes to sort
* @return sorted indexes
*/
static Iterator<IndexReference> sortByType( Iterator<IndexReference> indexes )
{
List<IndexReference> materialized = Iterators.asList( indexes );
return Iterators.concat(
Iterators.filter( i -> !i.isUnique(), materialized.iterator() ),
Iterators.filter( IndexReference::isUnique, materialized.iterator() ) );
}
}