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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://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 .
 */
package org.neo4j.kernel.impl.api.state;

import static org.neo4j.memory.HeapEstimator.shallowSizeOfInstance;
import static org.neo4j.storageengine.api.txstate.RelationshipModifications.noAdditionalDataDecorator;

import org.neo4j.memory.MemoryTracker;
import org.neo4j.storageengine.api.txstate.RelationshipModifications;

class StateNodeRelationshipIds implements RelationshipModifications.NodeRelationshipIds {
    private static final long SHALLOW_SIZE = shallowSizeOfInstance(StateNodeRelationshipIds.class);
    private final NodeStateImpl nodeState;
    private final boolean hasCreations;
    private final boolean hasDeletions;
    private final RelationshipModifications.IdDataDecorator relationshipVisit;

    static StateNodeRelationshipIds createStateNodeRelationshipIds(
            NodeStateImpl nodeState,
            RelationshipModifications.IdDataDecorator relationshipVisit,
            MemoryTracker memoryTracker) {
        memoryTracker.allocateHeap(SHALLOW_SIZE);
        return new StateNodeRelationshipIds(nodeState, relationshipVisit);
    }

    private StateNodeRelationshipIds(
            NodeStateImpl nodeState, RelationshipModifications.IdDataDecorator relationshipVisit) {
        this.nodeState = nodeState;
        this.hasCreations = nodeState.hasAddedRelationships();
        this.hasDeletions = nodeState.hasRemovedRelationships();
        this.relationshipVisit = relationshipVisit;
    }

    @Override
    public long nodeId() {
        return nodeState.getId();
    }

    @Override
    public boolean hasCreations() {
        return hasCreations;
    }

    @Override
    public boolean hasCreations(int type) {
        return hasCreations && nodeState.hasAddedRelationships(type);
    }

    @Override
    public boolean hasDeletions() {
        return hasDeletions;
    }

    @Override
    public RelationshipModifications.RelationshipBatch creations() {
        return nodeState.additionsAsRelationshipBatch(relationshipVisit);
    }

    @Override
    public RelationshipModifications.RelationshipBatch deletions() {
        return nodeState.removalsAsRelationshipBatch(noAdditionalDataDecorator());
    }

    @Override
    public void forEachCreationSplitInterruptible(RelationshipModifications.InterruptibleTypeIdsVisitor visitor) {
        nodeState.visitAddedIdsSplit(visitor, relationshipVisit);
    }

    @Override
    public void forEachDeletionSplitInterruptible(RelationshipModifications.InterruptibleTypeIdsVisitor visitor) {
        nodeState.visitRemovedIdsSplit(visitor);
    }
}