//------------------------------------------------------------
// Copyright (c) Microsoft Corporation.  All rights reserved.
//------------------------------------------------------------
 
namespace System.Activities.Tracking
{
    using System.Collections.ObjectModel;
 
    public class ActivityStateQuery : TrackingQuery
    {
        Collection<string> arguments;
        Collection<string> states;
        Collection<string> variables;        
        
        public ActivityStateQuery()
        {
            this.ActivityName = "*";
        }
 
        public string ActivityName
        {
            get;
            set;
        }
 
        public Collection<string> Arguments
        {
            get
            {
                if (this.arguments == null)
                {
                    this.arguments = new Collection<string>();
                }
 
                return this.arguments;
            }
        }
 
        public Collection<string> Variables
        {
            get
            {
                if (this.variables == null)
                {
                    this.variables = new Collection<string>();
                }
 
                return this.variables;
            }
        }        
 
        public Collection<string> States
        {
            get
            {
                if (this.states == null)
                {
                    this.states = new Collection<string>();
                }
                return this.states;
            }
        }
 
        internal bool HasStates
        {
            get
            {
                return this.states != null && this.states.Count > 0;
            }
        }
 
        internal bool HasArguments
        {
            get
            {
                return this.arguments != null && this.arguments.Count > 0;
            }
        }
 
        internal bool HasVariables
        {
            get
            {
                return this.variables != null && this.variables.Count > 0;
            }
        }        
    }
}