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IndexDescriptor.java
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IndexDescriptor.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.kernel.api.schema.index;
import java.util.Iterator;
import java.util.List;
import java.util.Optional;
import java.util.function.Predicate;
import org.neo4j.helpers.collection.Iterators;
import org.neo4j.internal.kernel.api.CapableIndexReference;
import org.neo4j.internal.kernel.api.IndexOrder;
import org.neo4j.internal.kernel.api.IndexValueCapability;
import org.neo4j.internal.kernel.api.TokenNameLookup;
import org.neo4j.internal.kernel.api.schema.SchemaDescriptor;
import org.neo4j.internal.kernel.api.schema.SchemaDescriptorSupplier;
import org.neo4j.internal.kernel.api.schema.SchemaUtil;
import org.neo4j.kernel.api.index.IndexProvider;
import org.neo4j.values.storable.ValueCategory;
import static java.lang.String.format;
import static org.neo4j.kernel.api.schema.index.IndexDescriptor.Filter.GENERAL;
import static org.neo4j.kernel.api.schema.index.IndexDescriptor.Filter.UNIQUE;
/**
* Internal representation of a graph index, including the schema unit it targets (eg. label-property combination)
* and the type of index. UNIQUE indexes are used to back uniqueness constraints.
*/
public class IndexDescriptor implements SchemaDescriptorSupplier, CapableIndexReference
{
public enum Type
{
GENERAL,
UNIQUE
}
public enum Filter implements Predicate<IndexDescriptor>
{
GENERAL
{
@Override
public boolean test( IndexDescriptor index )
{
return index.type == Type.GENERAL;
}
},
UNIQUE
{
@Override
public boolean test( IndexDescriptor index )
{
return index.type == Type.UNIQUE;
}
},
ANY
{
@Override
public boolean test( IndexDescriptor index )
{
return true;
}
}
}
public interface Supplier
{
IndexDescriptor getIndexDescriptor();
}
protected final SchemaDescriptor schema;
protected final IndexDescriptor.Type type;
protected final Optional<String> name;
protected final IndexProvider.Descriptor providerDescriptor;
public IndexDescriptor( SchemaDescriptor schema,
Type type,
Optional<String> name,
IndexProvider.Descriptor providerDescriptor )
{
this.schema = schema;
this.type = type;
this.name = name;
this.providerDescriptor = providerDescriptor;
}
// METHODS
public Type type()
{
return type;
}
/**
* This method currently returns the specific LabelSchemaDescriptor, as we do not support indexes on relations.
* When we do, consider down-typing this to a SchemaDescriptor.
*/
@Override
public SchemaDescriptor schema()
{
return schema;
}
@Override
public boolean isUnique()
{
return type == Type.UNIQUE;
}
@Override
public int label()
{
return schema.keyId();
}
@Override
public int[] properties()
{
return schema.getPropertyIds();
}
@Override
public String providerKey()
{
return providerDescriptor.getKey();
}
@Override
public String providerVersion()
{
return providerDescriptor.getVersion();
}
public Optional<String> name()
{
return name;
}
public IndexProvider.Descriptor providerDescriptor()
{
return providerDescriptor;
}
@Override
public IndexOrder[] orderCapability( ValueCategory... valueCategories )
{
return ORDER_NONE;
}
@Override
public IndexValueCapability valueCapability( ValueCategory... valueCategories )
{
return IndexValueCapability.NO;
}
/**
* @param tokenNameLookup used for looking up names for token ids.
* @return a user friendly description of what this index indexes.
*/
public String userDescription( TokenNameLookup tokenNameLookup )
{
return format( "Index( %s, %s )", type.name(), schema.userDescription( tokenNameLookup ) );
}
@Override
public boolean equals( Object o )
{
if ( o instanceof IndexDescriptor )
{
IndexDescriptor that = (IndexDescriptor)o;
return this.type() == that.type() && this.schema().equals( that.schema() );
}
return false;
}
@Override
public int hashCode()
{
return type.hashCode() & schema.hashCode();
}
@Override
public String toString()
{
return userDescription( SchemaUtil.idTokenNameLookup );
}
/**
* 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
*/
public static Iterator<IndexDescriptor> sortByType( Iterator<IndexDescriptor> indexes )
{
List<IndexDescriptor> materialized = Iterators.asList( indexes );
return Iterators.concat(
Iterators.filter( GENERAL, materialized.iterator() ),
Iterators.filter( UNIQUE, materialized.iterator() ) );
}
}