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Prowlarr/Migrator.net/Migrator/BaseMigrate.cs

111 lines
3.5 KiB

using Migrator.Framework;
using System.Collections.Generic;
namespace Migrator
{
public abstract class BaseMigrate
{
protected readonly ITransformationProvider _provider;
protected ILogger _logger;
protected List<long> _availableMigrations;
protected List<long> _original;
protected long _current;
protected bool _dryrun;
protected BaseMigrate(List<long> availableMigrations, ITransformationProvider provider, ILogger logger)
{
_provider = provider;
_availableMigrations = availableMigrations;
_original = new List<long> (_provider.AppliedMigrations.ToArray()); //clone
_logger = logger;
}
public static BaseMigrate GetInstance(List<long> availableMigrations, ITransformationProvider provider, ILogger logger)
{
return new MigrateAnywhere(availableMigrations, provider, logger);
}
public List<long> AppliedVersions
{
get { return _original; }
}
public virtual long Current
{
get { return _current; }
protected set { _current = value; }
}
public virtual bool DryRun
{
get { return _dryrun; }
set { _dryrun = value; }
}
public abstract long Previous { get; }
public abstract long Next { get; }
public void Iterate()
{
Current = Next;
}
public abstract bool Continue(long targetVersion);
public abstract void Migrate(IMigration migration);
/// <summary>
/// Finds the next migration available to be applied. Only returns
/// migrations that have NOT already been applied.
/// </summary>
/// <returns>The migration number of the next available Migration.</returns>
protected long NextMigration()
{
// Start searching at the current index
int migrationSearch = _availableMigrations.IndexOf(Current)+1;
// See if we can find a migration that matches the requirement
while(migrationSearch < _availableMigrations.Count
&& _provider.AppliedMigrations.Contains(_availableMigrations[migrationSearch]))
{
migrationSearch++;
}
// did we exhaust the list?
if(migrationSearch == _availableMigrations.Count){
// we're at the last one. Done!
return _availableMigrations[migrationSearch-1]+1;
}
// found one.
return _availableMigrations[migrationSearch];
}
/// <summary>
/// Finds the previous migration that has been applied. Only returns
/// migrations that HAVE already been applied.
/// </summary>
/// <returns>The most recently applied Migration.</returns>
protected long PreviousMigration()
{
// Start searching at the current index
int migrationSearch = _availableMigrations.IndexOf(Current)-1;
// See if we can find a migration that matches the requirement
while(migrationSearch > -1
&& !_provider.AppliedMigrations.Contains(_availableMigrations[migrationSearch]))
{
migrationSearch--;
}
// did we exhaust the list?
if(migrationSearch < 0){
// we're at the first one. Done!
return 0;
}
// found one.
return _availableMigrations[migrationSearch];
}
}
}