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EntityReadOperations.java
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EntityReadOperations.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.api.operations;
import org.neo4j.collection.primitive.PrimitiveIntIterator;
import org.neo4j.collection.primitive.PrimitiveIntSet;
import org.neo4j.collection.primitive.PrimitiveLongIterator;
import org.neo4j.cursor.Cursor;
import org.neo4j.kernel.api.exceptions.EntityNotFoundException;
import org.neo4j.kernel.api.exceptions.index.IndexNotApplicableKernelException;
import org.neo4j.kernel.api.exceptions.index.IndexNotFoundKernelException;
import org.neo4j.kernel.api.exceptions.schema.IndexBrokenKernelException;
import org.neo4j.kernel.api.schema_new.IndexQuery;
import org.neo4j.kernel.api.schema_new.index.NewIndexDescriptor;
import org.neo4j.kernel.impl.api.KernelStatement;
import org.neo4j.kernel.impl.api.RelationshipVisitor;
import org.neo4j.storageengine.api.Direction;
import org.neo4j.storageengine.api.NodeItem;
import org.neo4j.storageengine.api.RelationshipItem;
public interface EntityReadOperations
{
/**
* @param labelId the label id of the label that returned nodes are guaranteed to have
* @return ids of all nodes that have the given label
*/
PrimitiveLongIterator nodesGetForLabel( KernelStatement state, int labelId );
/**
* Queries the given index with the given index query.
*
* @param statement the KernelStatement to use.
* @param index the index to query against.
* @param predicates the {@link IndexQuery} predicates to query for.
* @return ids of the matching nodes
* @throws IndexNotFoundKernelException if no such index is found.
*/
PrimitiveLongIterator indexQuery( KernelStatement statement, NewIndexDescriptor index, IndexQuery... predicates )
throws IndexNotFoundKernelException, IndexNotApplicableKernelException;
/**
* Returns an iterable with the matched node.
*
* @throws IndexNotFoundKernelException if no such index found.
* @throws IndexBrokenKernelException if we found an index that was corrupt or otherwise in a failed state.
*/
long nodeGetFromUniqueIndexSeek( KernelStatement state, NewIndexDescriptor index, Object value )
throws IndexNotFoundKernelException, IndexBrokenKernelException, IndexNotApplicableKernelException;
long nodesCountIndexed( KernelStatement statement, NewIndexDescriptor index, long nodeId, Object value )
throws IndexNotFoundKernelException, IndexBrokenKernelException;
boolean graphHasProperty( KernelStatement state, int propertyKeyId );
Object graphGetProperty( KernelStatement state, int propertyKeyId );
/**
* Return all property keys associated with a relationship.
*/
PrimitiveIntIterator graphGetPropertyKeys( KernelStatement state );
PrimitiveLongIterator nodesGetAll( KernelStatement state );
PrimitiveLongIterator relationshipsGetAll( KernelStatement state );
<EXCEPTION extends Exception> void relationshipVisit( KernelStatement statement, long relId,
RelationshipVisitor<EXCEPTION> visitor ) throws EntityNotFoundException, EXCEPTION;
Cursor<NodeItem> nodeCursorById( KernelStatement statement, long nodeId ) throws EntityNotFoundException;
Cursor<RelationshipItem> relationshipCursorById( KernelStatement statement, long relId )
throws EntityNotFoundException;
Cursor<RelationshipItem> relationshipCursorGetAll( KernelStatement statement );
Cursor<RelationshipItem> nodeGetRelationships( KernelStatement statement, NodeItem node, Direction direction );
Cursor<RelationshipItem> nodeGetRelationships( KernelStatement statement, NodeItem node, Direction direction,
PrimitiveIntSet relTypes );
long nodesGetCount( KernelStatement statement );
long relationshipsGetCount( KernelStatement statement );
boolean nodeExists( KernelStatement statement, long id );
/**
* Returns the set of types for relationships attached to this node.
*
* @param statement the current kernel statement
* @param nodeItem the node
* @return the set of types for relationships attached to this node.
* @throws IllegalStateException if no current node is selected
*/
PrimitiveIntSet relationshipTypes( KernelStatement statement, NodeItem nodeItem );
/**
* Returns degree, e.g. number of relationships for this node.
*
* @param statement the current kernel statement
* @param nodeItem the node
* @param direction {@link Direction} filter when counting relationships, e.g. only
* {@link Direction#OUTGOING outgoing} or {@link Direction#INCOMING incoming}.
* @return degree of relationships in the given direction.
*/
int degree( KernelStatement statement, NodeItem nodeItem, Direction direction );
/**
* Returns degree, e.g. number of relationships for this node.
*
* @param statement the current kernel statement
* @param nodeItem the node
* @param direction {@link Direction} filter on when counting relationships, e.g. only
* {@link Direction#OUTGOING outgoing} or {@link Direction#INCOMING incoming}.
* @param relType relationship type id to filter when counting relationships.
* @return degree of relationships in the given direction and relationship type.
*/
int degree( KernelStatement statement, NodeItem nodeItem, Direction direction, int relType );
}