Logo Search packages:      
Sourcecode: f-spot version File versions

ConditionType.cs

//
// ConditionType.cs
//
// Author:
//   Lluis Sanchez Gual
//
// Copyright (C) 2007 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//


using System;
using System.Xml;
using Mono.Addins.Description;
using System.Collections;

namespace Mono.Addins
{
      public abstract class ConditionType
      {
            internal event EventHandler Changed;
            string id;
            
            public abstract bool Evaluate (NodeElement conditionNode);
            
            public void NotifyChanged ()
            {
                  if (Changed != null)
                        Changed (this, EventArgs.Empty);
            }
            
            internal string Id {
                  get { return id; }
                  set { id = value; }
            }
      }
      
      internal class BaseCondition
      {
            BaseCondition parent;
            
            internal BaseCondition (BaseCondition parent)
            {
                  this.parent = parent;
            }
            
            public virtual bool Evaluate (ExtensionContext ctx)
            {
                  return parent == null || parent.Evaluate (ctx);
            }
            
            internal virtual void GetConditionTypes (ArrayList listToFill)
            {
            }
      }
      
      internal class NullCondition: BaseCondition
      {
            public NullCondition (): base (null)
            {
            }
            
            public override bool Evaluate (ExtensionContext ctx)
            {
                  return false;
            }
      }
      
      class OrCondition: BaseCondition
      {
            BaseCondition[] conditions;
            
            public OrCondition (BaseCondition[] conditions, BaseCondition parent): base (parent)
            {
                  this.conditions = conditions;
            }
            
            public override bool Evaluate (ExtensionContext ctx)
            {
                  if (!base.Evaluate (ctx))
                        return false;
                  foreach (BaseCondition cond in conditions)
                        if (cond.Evaluate (ctx))
                              return true;
                  return false;
            }
            
            internal override void GetConditionTypes (ArrayList listToFill)
            {
                  foreach (BaseCondition cond in conditions)
                        cond.GetConditionTypes (listToFill);
            }
      }
      
      class AndCondition: BaseCondition
      {
            BaseCondition[] conditions;
            
            public AndCondition (BaseCondition[] conditions, BaseCondition parent): base (parent)
            {
                  this.conditions = conditions;
            }
            
            public override bool Evaluate (ExtensionContext ctx)
            {
                  if (!base.Evaluate (ctx))
                        return false;
                  foreach (BaseCondition cond in conditions)
                        if (!cond.Evaluate (ctx))
                              return false;
                  return true;
            }
            
            internal override void GetConditionTypes (ArrayList listToFill)
            {
                  foreach (BaseCondition cond in conditions)
                        cond.GetConditionTypes (listToFill);
            }
      }

      
      internal sealed class Condition: BaseCondition
      {
            ExtensionNodeDescription node;
            string typeId;
            
            internal Condition (ExtensionNodeDescription element, BaseCondition parent): base (parent)
            {
                  typeId = element.GetAttribute ("id");
                  node = element;
            }
            
            public override bool Evaluate (ExtensionContext ctx)
            {
                  if (!base.Evaluate (ctx))
                        return false;
                  
                  ConditionType type = ctx.GetCondition (typeId);
                  if (type == null) {
                        AddinManager.ReportError ("Condition '" + typeId + "' not found in current extension context.", null, null, false);
                        return false;
                  }
                  
                  try {
                        return type.Evaluate (node);
                  }
                  catch (Exception ex) {
                        AddinManager.ReportError ("Error while evaluating condition '" + typeId + "'", null, ex, false);
                        return false;
                  }
            }
            
            internal override void GetConditionTypes (ArrayList listToFill)
            {
                  listToFill.Add (typeId);
            }
      }
}

Generated by  Doxygen 1.6.0   Back to index