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Move logic to create cursors to static method
Move all logic to create the appropriate cursor given denseness, direction and types to a central place instead of redoing the same stuff everywhere.
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156 changes: 156 additions & 0 deletions
156
...ernel-api/src/main/java/org/neo4j/internal/kernel/api/helpers/RelationshipSelections.java
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| Original file line number | Original file line | Diff line number | Diff line change |
|---|---|---|---|
| @@ -0,0 +1,156 @@ | |||
| /* | |||
| * 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.helpers; | |||
|
|
|||
| import org.neo4j.graphdb.Direction; | |||
| import org.neo4j.graphdb.ResourceIterator; | |||
| import org.neo4j.internal.kernel.api.CursorFactory; | |||
| import org.neo4j.internal.kernel.api.NodeCursor; | |||
| import org.neo4j.internal.kernel.api.RelationshipGroupCursor; | |||
| import org.neo4j.internal.kernel.api.RelationshipTraversalCursor; | |||
|
|
|||
| /** | |||
| * Utilities for dealing with RelationshipSelectionCursor and corresponding iterators. | |||
| */ | |||
| public final class RelationshipSelections | |||
| { | |||
| private RelationshipSelections() | |||
| { | |||
| throw new UnsupportedOperationException( "Do not instantiate" ); | |||
| } | |||
|
|
|||
| /** | |||
| * Returns a selection cursor given the provided node cursor, direction and relationship types. | |||
| * | |||
| * @param cursors A cursor factor used for allocating the needed cursors | |||
| * @param node A node cursor positioned at the current node. | |||
| * @param direction The direction of the the relationship. | |||
| * @param types The types of the relationship | |||
| * @return A cursor that allows traversing the relationship chain. | |||
| */ | |||
| public static RelationshipSelectionCursor selectionCursor( CursorFactory cursors, NodeCursor node, | |||
| Direction direction, int[] types ) | |||
| { | |||
| if ( node.isDense() ) | |||
| { | |||
| RelationshipDenseSelectionCursor selectionCursor = new RelationshipDenseSelectionCursor(); | |||
| setupDense( selectionCursor, cursors, node, direction, types ); | |||
| return selectionCursor; | |||
| } | |||
| else | |||
| { | |||
| RelationshipSparseSelectionCursor selectionCursor = new RelationshipSparseSelectionCursor(); | |||
|
|
|||
| setupSparse( selectionCursor, cursors, node, direction, types ); | |||
| return selectionCursor; | |||
| } | |||
| } | |||
|
|
|||
| /** | |||
| * Returns a resource iterator given the provided node cursor, direction and relationship types. | |||
| * | |||
| * @param cursors A cursor factor used for allocating the needed cursors | |||
| * @param node A node cursor positioned at the current node. | |||
| * @param direction The direction of the the relationship. | |||
| * @param types The types of the relationship | |||
| * @param factory factory for creating instance of generic type T | |||
| * @return An iterator that allows traversing the relationship chain. | |||
| */ | |||
| public static <T> ResourceIterator<T> selectionIterator( CursorFactory cursors, NodeCursor node, | |||
| Direction direction, int[] types, RelationshipFactory<T> factory ) | |||
| { | |||
| if ( node.isDense() ) | |||
| { | |||
| RelationshipDenseSelectionIterator<T> selectionIterator = | |||
| new RelationshipDenseSelectionIterator<>( factory ); | |||
| setupDense( selectionIterator, cursors, node, direction, types ); | |||
| return selectionIterator; | |||
| } | |||
| else | |||
| { | |||
| RelationshipSparseSelectionIterator<T> selectionIterator = | |||
| new RelationshipSparseSelectionIterator<>( factory ); | |||
|
|
|||
| setupSparse( selectionIterator, cursors, node, direction, types ); | |||
| return selectionIterator; | |||
| } | |||
| } | |||
|
|
|||
| private static void setupDense( RelationshipDenseSelection denseSelection, CursorFactory cursors, NodeCursor node, | |||
| Direction direction, int[] types ) | |||
| { | |||
|
|
|||
| RelationshipGroupCursor groupCursor = cursors.allocateRelationshipGroupCursor(); | |||
| RelationshipTraversalCursor traversalCursor = cursors.allocateRelationshipTraversalCursor(); | |||
| try | |||
| { | |||
| node.relationships( groupCursor ); | |||
| switch ( direction ) | |||
| { | |||
| case OUTGOING: | |||
| denseSelection.outgoing( groupCursor, traversalCursor, types ); | |||
| break; | |||
| case INCOMING: | |||
| denseSelection.incoming( groupCursor, traversalCursor, types ); | |||
| break; | |||
| case BOTH: | |||
| denseSelection.all( groupCursor, traversalCursor, types ); | |||
| break; | |||
| default: | |||
| throw new IllegalStateException( "Unknown direction: " + direction ); | |||
| } | |||
| } | |||
| catch ( Throwable t ) | |||
| { | |||
| groupCursor.close(); | |||
| traversalCursor.close(); | |||
| throw t; | |||
| } | |||
| } | |||
|
|
|||
| private static void setupSparse( RelationshipSparseSelection sparseSelection, | |||
| CursorFactory cursors, NodeCursor node, Direction direction, int[] types ) | |||
| { | |||
| RelationshipTraversalCursor traversalCursor = cursors.allocateRelationshipTraversalCursor(); | |||
| try | |||
| { | |||
| node.allRelationships( traversalCursor ); | |||
| switch ( direction ) | |||
| { | |||
| case OUTGOING: | |||
| sparseSelection.outgoing( traversalCursor, types ); | |||
| break; | |||
| case INCOMING: | |||
| sparseSelection.incoming( traversalCursor, types ); | |||
| break; | |||
| case BOTH: | |||
| sparseSelection.all( traversalCursor, types ); | |||
| break; | |||
| default: | |||
| throw new IllegalStateException( "Unknown direction: " + direction ); | |||
| } | |||
| } | |||
| catch ( Throwable t ) | |||
| { | |||
| traversalCursor.close(); | |||
| throw t; | |||
| } | |||
| } | |||
| } | |||
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