wasCSharpSQLite – Rev 1

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//
// System.Data.SqlClient.DbEnumerator.cs
//
// Author:
//   Tim Coleman (tim@timcoleman.com)
//
// Copyright (C) Tim Coleman, 2002
//

//
// Copyright (C) 2004 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.Collections;
using System.ComponentModel;
using System.Data;

namespace System.Data.Common {
        public class DbEnumerator : IEnumerator
        {
                #region Fields

                readonly IDataReader reader;
                readonly bool closeReader;
                readonly SchemaInfo [] schema;
                readonly object [] values;
        
                #endregion // Fields

                #region Constructors

                public DbEnumerator (IDataReader reader) 
                        : this (reader, false)
                {
                }

                public DbEnumerator (IDataReader reader, bool closeReader)
                {
                        this.reader = reader;
                        this.closeReader = closeReader;
                        this.values = new object [reader.FieldCount];
                        this.schema = LoadSchema (reader);
                }

                #endregion // Constructors

                #region Properties

                public object Current {
                        get { 
                                reader.GetValues (values);
                                return new DbDataRecordImpl (schema, values); 
                        }
                }

                #endregion // Properties

                #region Methods

                private static SchemaInfo[] LoadSchema (IDataReader reader)
                {
                        int fieldCount = reader.FieldCount;
                        SchemaInfo[] schema = new SchemaInfo [fieldCount];

                        for(int i=0; i < fieldCount; i++) {
                                SchemaInfo columnSchema = new SchemaInfo ();

                                columnSchema.ColumnName = reader.GetName(i);
                                columnSchema.ColumnOrdinal = i; 
                                columnSchema.DataTypeName = reader.GetDataTypeName (i);
                                columnSchema.FieldType = reader.GetFieldType (i);

                                schema [i] = columnSchema;
                        }

                        return schema;
                }

                public bool MoveNext ()
                {
                        if (reader.Read ()) 
                                return true;
                        if (closeReader)
                                reader.Close ();
                        return false;
                }

                [EditorBrowsable (EditorBrowsableState.Never)]
                public void Reset ()
                {
                        throw new NotSupportedException ();
                }
                
                #endregion // Methods
        }
}