Category.cs

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Practices.Prism.ViewModel;
using System.Data.Linq.Mapping;
using System.Data.Linq;
using System.Collections;

namespace Bick.Budget.Entities.Categories
{
    [Table(Name = "Categories")]
    public class Category : NotificationObject
    {
        #region Fields
        /// <summary>
        /// Stores category ID
        /// </summary>
        private Guid id;

        /// <summary>
        /// Stores category name
        /// </summary>
        private string name;

        /// <summary>
        /// Stores category type
        /// </summary>
        private ECategoryType type;

        /// <summary>
        /// Stores all transactions in category
        /// </summary>
        private EntitySet<Transactions.Transaction> transactions;
        #endregion

        #region Constructors
        /// <summary>
        /// Default constructor for Category class
        /// </summary>
        public Category()
        {
            this.ID = Guid.NewGuid();
            this.transactions = new EntitySet<Transactions.Transaction>();
        }
        #endregion

        #region Properties
        /// <summary>
        /// Gets category ID
        /// </summary>
        [Column(IsPrimaryKey = true)]
        public Guid ID
        {
            get
            {
                return this.id;
            }

            private set
            {
                if (this.id != value)
                {
                    this.id = value;
                    this.RaisePropertyChanged(() => this.ID);
                }
            }
        }

        /// <summary>
        /// Gets or sets category name
        /// </summary>
        [Column]
        public string Name
        {
            get
            {
                return this.name;
            }

            set
            {
                if (this.name != value)
                {
                    this.name = value;
                    this.RaisePropertyChanged(() => this.Name);
                }
            }
        }

        /// <summary>
        /// Gets or sets category type
        /// </summary>
        [Column(CanBeNull = true, DbType = "NVarChar(15)")]
        public ECategoryType Type
        {
            get
            {
                return this.type;
            }

            set
            {
                if (this.type != value)
                {
                    this.type = value;
                    this.RaisePropertyChanged(() => this.Type);
                }
            }
        }

        /// <summary>
        /// Gets all transactions in current category
        /// </summary>
        public EntitySet<Transactions.Transaction> Transactions
        {
            get
            {
                if (this.transactions == null)
                {
                    this.transactions = new EntitySet<Transactions.Transaction>();
                    this.transactions.CollectionChanged += new System.Collections.Specialized.NotifyCollectionChangedEventHandler(this.OnTransactionsChanged);
                }

                return this.transactions;
            }

            private set
            {
                if (this.transactions != value)
                {
                    this.transactions = value;
                    this.RaisePropertyChanged(() => this.Transactions);
                }
            }
        }

        /// <summary>
        /// Gets list of transactions that was added to current category in one pack
        /// </summary>
        public IList AddedTransactions
        {
            get;
            private set;
        }
        #endregion

        /// <summary>
        /// Handles changes in category's transactions
        /// </summary>
        /// <param name="sender">Sender</param>
        /// <param name="e">Event arguments</param>
        private void OnTransactionsChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
        {
            this.AddedTransactions = e.NewItems;
            foreach (Transactions.Transaction t in e.NewItems)
            {
                t.Category = this;
            }

            this.AddedTransactions = null;
            this.RaisePropertyChanged(() => this.Transactions);
        }
    }
}