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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.util;

import org.neo4j.kernel.api.exceptions.Status;

public class ReadAndDeleteTransactionConflictException extends RuntimeException implements Status.HasStatus
{
    private static final String CONCURRENT_DELETE_MESSAGE = "Database elements (nodes, relationships, properties) were observed during query execution, " +
            "but got deleted by an overlapping committed transaction before the query results could be serialised. " +
            "The transaction might succeed if it is retried.";
    private static final String DELETED_IN_TRANSACTION_MESSAGE = "Database elements (nodes, relationships, properties) were deleted in this transaction, " +
            "but were also included in the result set.";

    private final boolean deletedInThisTransaction;

    public ReadAndDeleteTransactionConflictException( boolean deletedInThisTransaction )
    {
        super( deletedInThisTransaction ? DELETED_IN_TRANSACTION_MESSAGE : CONCURRENT_DELETE_MESSAGE );
        this.deletedInThisTransaction = deletedInThisTransaction;
    }

    public ReadAndDeleteTransactionConflictException( boolean deletedInThisTransaction, Throwable cause )
    {
        super( deletedInThisTransaction ? DELETED_IN_TRANSACTION_MESSAGE : CONCURRENT_DELETE_MESSAGE, cause );
        this.deletedInThisTransaction = deletedInThisTransaction;
    }

    public boolean wasDeletedInThisTransaction()
    {
        return deletedInThisTransaction;
    }

    @Override
    public Status status()
    {
        return deletedInThisTransaction ? Status.Statement.EntityNotFound : Status.Transaction.Outdated;
    }
}