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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 [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 .
 */
package org.neo4j.kernel.impl.transaction;

import java.io.IOException;
import java.util.Objects;

import org.neo4j.internal.helpers.collection.Visitor;
import org.neo4j.kernel.impl.transaction.log.LogicalTransactionStore;
import org.neo4j.kernel.impl.transaction.log.entry.LogEntryCommit;
import org.neo4j.kernel.impl.transaction.log.entry.LogEntryStart;
import org.neo4j.storageengine.api.StorageCommand;

/**
 * This class represents the concept of a TransactionRepresentation that has been
 * committed to the TransactionStore. It contains, in addition to the TransactionRepresentation
 * itself, a Start and Commit entry. This is the thing that {@link LogicalTransactionStore} returns when
 * asked for a transaction via a cursor.
 */
public class CommittedTransactionRepresentation
{
    private final LogEntryStart startEntry;
    private final TransactionRepresentation transactionRepresentation;
    private final LogEntryCommit commitEntry;

    public CommittedTransactionRepresentation( LogEntryStart startEntry, TransactionRepresentation transactionRepresentation, LogEntryCommit commitEntry )
    {
        this.startEntry = startEntry;
        this.transactionRepresentation = transactionRepresentation;
        this.commitEntry = commitEntry;
    }

    public void accept( Visitor visitor ) throws IOException
    {
        transactionRepresentation.accept( visitor );
    }

    public LogEntryStart getStartEntry()
    {
        return startEntry;
    }

    public TransactionRepresentation getTransactionRepresentation()
    {
        return transactionRepresentation;
    }

    public LogEntryCommit getCommitEntry()
    {
        return commitEntry;
    }

    public int getChecksum()
    {
        return getCommitEntry().getChecksum();
    }

    @Override
    public String toString()
    {
        return "CommittedTransactionRepresentation{" +
                "startEntry=" + startEntry +
                ", transactionRepresentation=" + transactionRepresentation +
                ", commitEntry=" + commitEntry +
                '}';
    }

    @Override
    public boolean equals( Object o )
    {
        if ( this == o )
        {
            return true;
        }
        if ( o == null || getClass() != o.getClass() )
        {
            return false;
        }
        CommittedTransactionRepresentation that = (CommittedTransactionRepresentation) o;
        return Objects.equals( startEntry, that.startEntry ) &&
                Objects.equals( transactionRepresentation, that.transactionRepresentation ) &&
                Objects.equals( commitEntry, that.commitEntry );
    }

    @Override
    public int hashCode()
    {
        return Objects.hash( startEntry, transactionRepresentation, commitEntry );
    }
}