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BuiltInProcedures.java
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BuiltInProcedures.java
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/*
* Copyright (c) 2002-2016 "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.builtinprocs;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Stream;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.kernel.api.KernelTransaction;
import org.neo4j.kernel.api.ReadOperations;
import org.neo4j.kernel.api.StatementTokenNameLookup;
import org.neo4j.kernel.api.TokenNameLookup;
import org.neo4j.kernel.api.exceptions.ProcedureException;
import org.neo4j.kernel.api.exceptions.Status;
import org.neo4j.kernel.api.exceptions.index.IndexNotFoundKernelException;
import org.neo4j.kernel.api.index.IndexDescriptor;
import org.neo4j.kernel.api.proc.ProcedureSignature;
import org.neo4j.kernel.impl.api.TokenAccess;
import org.neo4j.procedure.Context;
import org.neo4j.procedure.Procedure;
import static org.neo4j.helpers.collection.Iterators.asList;
import static org.neo4j.procedure.Procedure.Mode.READ;
public class BuiltInProcedures
{
@Context
public KernelTransaction tx;
@Procedure(name = "db.labels", mode = READ)
public Stream<LabelResult> listLabels()
{
return TokenAccess.LABELS.inUse( tx.acquireStatement() ).map( LabelResult::new ).stream();
}
@Procedure(name = "db.propertyKeys", mode = READ)
public Stream<PropertyKeyResult> listPropertyKeys()
{
return TokenAccess.PROPERTY_KEYS.inUse( tx.acquireStatement() ).map( PropertyKeyResult::new ).stream();
}
@Procedure(name = "db.relationshipTypes", mode = READ)
public Stream<RelationshipTypeResult> listRelationshipTypes()
{
return TokenAccess.RELATIONSHIP_TYPES.inUse( tx.acquireStatement() )
.map( RelationshipTypeResult::new ).stream();
}
@Procedure(name = "db.indexes", mode = READ)
public Stream<IndexResult> listIndexes() throws ProcedureException
{
ReadOperations operations = tx.acquireStatement().readOperations();
TokenNameLookup tokens = new StatementTokenNameLookup( operations );
List<IndexDescriptor> indexes = asList( operations.indexesGetAll() );
indexes.sort( ( a, b ) -> a.userDescription( tokens ).compareTo( b.userDescription( tokens ) ) );
ArrayList<IndexResult> result = new ArrayList<>();
for ( IndexDescriptor index : indexes )
{
try
{
result.add( new IndexResult( "INDEX ON " + index.userDescription( tokens ),
operations.indexGetState( index ).toString() ) );
}
catch ( IndexNotFoundKernelException e )
{
throw new ProcedureException( Status.Schema.IndexNotFound, e,
"No index on ", index.userDescription( tokens ) );
}
}
return result.stream();
}
@Procedure(name = "db.awaitIndex", mode = READ)
public void awaitIndex()
{
}
@Procedure(name = "db.constraints", mode = READ)
public Stream<ConstraintResult> listConstraints()
{
ReadOperations operations = tx.acquireStatement().readOperations();
TokenNameLookup tokens = new StatementTokenNameLookup( operations );
return asList( operations.constraintsGetAll() )
.stream()
.map( ( constraint ) -> constraint.userDescription( tokens ) )
.sorted()
.map( ConstraintResult::new );
}
@Procedure(name = "dbms.procedures", mode = READ)
public Stream<ProcedureResult> listProcedures()
{
return tx.acquireStatement().readOperations().proceduresGetAll()
.stream()
.sorted( ( a, b ) -> a.name().toString().compareTo( b.name().toString() ) )
.map( ProcedureResult::new );
}
public class LabelResult
{
public final String label;
private LabelResult( Label label )
{
this.label = label.name();
}
}
public class PropertyKeyResult
{
public final String propertyKey;
private PropertyKeyResult( String propertyKey )
{
this.propertyKey = propertyKey;
}
}
public class RelationshipTypeResult
{
public final String relationshipType;
private RelationshipTypeResult( RelationshipType relationshipType )
{
this.relationshipType = relationshipType.name();
}
}
public class IndexResult
{
public final String description;
public final String state;
private IndexResult( String description, String state )
{
this.description = description;
this.state = state;
}
}
public class ConstraintResult
{
public final String description;
private ConstraintResult( String description )
{
this.description = description;
}
}
public class ProcedureResult
{
public final String name;
public final String signature;
private ProcedureResult( ProcedureSignature signature )
{
this.name = signature.name().toString();
this.signature = signature.toString();
}
}
}