IDiffEngine.cs :  » Installers-Generators » WiX » Microsoft » Deployment » Samples » DDiff » C# / CSharp Open Source

using System;
using System.IO;
using System.Collections;

namespace Microsoft.Deployment.Samples.DDiff{
  public interface IDiffEngine
  {
    float GetDiffQuality(string diffInput1, string diffInput2, string[] options, IDiffEngineFactory diffFactory);

    bool GetDiff(string diffInput1, string diffInput2, string[] options, TextWriter diffOutput, string linePrefix, IDiffEngineFactory diffFactory);

    IDiffEngine Clone();
  }

  public interface IDiffEngineFactory
  {
    IDiffEngine GetDiffEngine(string diffInput1, string diffInput2, string[] options);
  }

  public class BestQualityDiffEngineFactory : IDiffEngineFactory
  {
    public virtual IDiffEngine GetDiffEngine(string diffInput1, string diffInput2, string[] options)
    {
      float bestDiffQuality = 0;
      IDiffEngine bestDiffEngine = null;

      foreach(IDiffEngine diffEngine in diffEngines)
      {
        float diffQuality = diffEngine.GetDiffQuality(diffInput1, diffInput2, options, this);
        if(diffQuality > bestDiffQuality)
        {
          bestDiffQuality = diffQuality;
          bestDiffEngine = diffEngine;
        }
      }
      return (bestDiffEngine != null ? bestDiffEngine.Clone() : null);
    }

    public BestQualityDiffEngineFactory() : this(null) { }
    public BestQualityDiffEngineFactory(IDiffEngine[] diffEngines)
    {
      this.diffEngines = (diffEngines != null ? new ArrayList(diffEngines) : new ArrayList());
    }

    protected IList diffEngines;

    public virtual void Add(IDiffEngine diffEngine)
    {
      diffEngines.Add(diffEngine);
    }

    public virtual void Remove(IDiffEngine diffEngine)
    {
      diffEngines.Remove(diffEngine);
    }

    public IList DiffEngines
    {
      get
      {
        return ArrayList.ReadOnly(diffEngines);
      }
    }
  }
}