System.Data.SQLite
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Overview
Comment:Rename the SQLiteVirtualTableCursorEnumerable class to SQLiteVirtualTableCursorEnumerator.
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SHA1: 4e38ea39a310f642bc26b42d4ee8f766831ee488
User & Date: mistachkin 2013-06-26 03:18:01
Context
2013-06-26
04:23
Add generic variants of the SQLiteModuleEnumerable and SQLiteVirtualTableCursorEnumerator classes. check-in: 7da399e402 user: mistachkin tags: trunk
03:18
Rename the SQLiteVirtualTableCursorEnumerable class to SQLiteVirtualTableCursorEnumerator. check-in: 4e38ea39a3 user: mistachkin tags: trunk
02:20
Modify the result code handling performed by the SQLiteModuleNoop class in order to make it more flexible for use with derived classes. Rename the ReturnCode property of the SQLiteException class to ResultCode. check-in: d2d80220a8 user: mistachkin tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to System.Data.SQLite/SQLiteModuleEnumerable.cs.

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 ********************************************************/

using System.Collections;
using System.Globalization;

namespace System.Data.SQLite
{
    #region SQLiteVirtualTableCursorEnumerable Class
    /// <summary>
    /// This class represents a virtual table cursor to be used with the
    /// <see cref="SQLiteModuleEnumerable" /> class.  It is not sealed and may
    /// be used as the base class for any user-defined virtual table cursor
    /// class that wraps an <see cref="IEnumerator" /> object instance.
    /// </summary>
    public class SQLiteVirtualTableCursorEnumerable :
            SQLiteVirtualTableCursor /* NOT SEALED */
    {
        #region Private Data
        /// <summary>
        /// The <see cref="IEnumerator" /> instance provided when this cursor
        /// was created.
        /// </summary>
................................................................................
        /// The <see cref="SQLiteVirtualTable" /> object instance associated
        /// with this object instance.
        /// </param>
        /// <param name="enumerator">
        /// The <see cref="IEnumerator" /> instance to expose as a virtual
        /// table cursor.
        /// </param>
        public SQLiteVirtualTableCursorEnumerable(
            SQLiteVirtualTable table,
            IEnumerator enumerator
            )
            : base(table)
        {
            this.enumerator = enumerator;
            this.endOfEnumerator = true;
................................................................................
        /// </summary>
        private void CheckDisposed() /* throw */
        {
#if THROW_ON_DISPOSED
            if (disposed)
            {
                throw new ObjectDisposedException(
                    typeof(SQLiteVirtualTableCursorEnumerable).Name);
            }
#endif
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
................................................................................
    #endregion

    ///////////////////////////////////////////////////////////////////////////

    #region SQLiteModuleEnumerable Class
    /// <summary>
    /// This class implements a virtual table module that exposes an
    /// IEnumerable instance as a read-only virtual table.  It is not sealed
    /// and may be used as the base class for any user-defined virtual table

    /// class that wraps an <see cref="IEnumerable" /> object instance.
    /// </summary>
    public class SQLiteModuleEnumerable : SQLiteModuleNoop /* NOT SEALED */
    {
        #region Private Constants
        /// <summary>
        /// The CREATE TABLE statement used to declare the schema for the
        /// virtual table.
................................................................................
        /// <returns>
        /// The value of <see cref="SQLiteErrorCode.Error"/>.
        /// </returns>
        protected virtual SQLiteErrorCode CursorTypeMismatchError(
            SQLiteVirtualTableCursor cursor
            )
        {
            SetCursorError(cursor, "not an \"enumerable\" cursor");
            return SQLiteErrorCode.Error;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Sets the table error message to one that indicates the virtual
................................................................................
        public override SQLiteErrorCode Open(
            SQLiteVirtualTable table,
            ref SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            cursor = new SQLiteVirtualTableCursorEnumerable(
                table, enumerable.GetEnumerator());

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

................................................................................
        /// </returns>
        public override SQLiteErrorCode Close(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerable enumerableCursor =
                cursor as SQLiteVirtualTableCursorEnumerable;

            if (enumerableCursor == null)
                return CursorTypeMismatchError(cursor);

            enumerableCursor.Close();
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
................................................................................
            int indexNumber,
            string indexString,
            SQLiteValue[] values
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerable enumerableCursor =
                cursor as SQLiteVirtualTableCursorEnumerable;

            if (enumerableCursor == null)
                return CursorTypeMismatchError(cursor);

            enumerableCursor.Filter(indexNumber, indexString, values);
            enumerableCursor.Reset(); /* NO RESULT */
            enumerableCursor.MoveNext(); /* IGNORED */

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
................................................................................
        /// </returns>
        public override SQLiteErrorCode Next(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerable enumerableCursor =
                cursor as SQLiteVirtualTableCursorEnumerable;

            if (enumerableCursor == null)
                return CursorTypeMismatchError(cursor);

            if (enumerableCursor.EndOfEnumerator)
                return CursorEndOfEnumeratorError(cursor);

            enumerableCursor.MoveNext(); /* IGNORED */
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Eof" /> method.
................................................................................
        /// </returns>
        public override bool Eof(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerable enumerableCursor =
                cursor as SQLiteVirtualTableCursorEnumerable;

            if (enumerableCursor == null)
                return ResultCodeToEofResult(CursorTypeMismatchError(cursor));

            return enumerableCursor.EndOfEnumerator;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Column" /> method.
        /// </summary>
................................................................................
            SQLiteVirtualTableCursor cursor,
            SQLiteContext context,
            int index
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerable enumerableCursor =
                cursor as SQLiteVirtualTableCursorEnumerable;

            if (enumerableCursor == null)
                return CursorTypeMismatchError(cursor);

            if (enumerableCursor.EndOfEnumerator)
                return CursorEndOfEnumeratorError(cursor);

            object current = enumerableCursor.Current;

            if (current != null)
                context.SetString(GetStringFromObject(current));
            else
                context.SetNull();

            return SQLiteErrorCode.Ok;
................................................................................
        public override SQLiteErrorCode RowId(
            SQLiteVirtualTableCursor cursor,
            ref long rowId
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerable enumerableCursor =
                cursor as SQLiteVirtualTableCursorEnumerable;

            if (enumerableCursor == null)
                return CursorTypeMismatchError(cursor);

            if (enumerableCursor.EndOfEnumerator)
                return CursorEndOfEnumeratorError(cursor);

            object current = enumerableCursor.Current;

            rowId = GetRowIdFromObject(current);
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////








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 ********************************************************/

using System.Collections;
using System.Globalization;

namespace System.Data.SQLite
{
    #region SQLiteVirtualTableCursorEnumerator Class
    /// <summary>
    /// This class represents a virtual table cursor to be used with the
    /// <see cref="SQLiteModuleEnumerable" /> class.  It is not sealed and may
    /// be used as the base class for any user-defined virtual table cursor
    /// class that wraps an <see cref="IEnumerator" /> object instance.
    /// </summary>
    public class SQLiteVirtualTableCursorEnumerator :
            SQLiteVirtualTableCursor /* NOT SEALED */
    {
        #region Private Data
        /// <summary>
        /// The <see cref="IEnumerator" /> instance provided when this cursor
        /// was created.
        /// </summary>
................................................................................
        /// The <see cref="SQLiteVirtualTable" /> object instance associated
        /// with this object instance.
        /// </param>
        /// <param name="enumerator">
        /// The <see cref="IEnumerator" /> instance to expose as a virtual
        /// table cursor.
        /// </param>
        public SQLiteVirtualTableCursorEnumerator(
            SQLiteVirtualTable table,
            IEnumerator enumerator
            )
            : base(table)
        {
            this.enumerator = enumerator;
            this.endOfEnumerator = true;
................................................................................
        /// </summary>
        private void CheckDisposed() /* throw */
        {
#if THROW_ON_DISPOSED
            if (disposed)
            {
                throw new ObjectDisposedException(
                    typeof(SQLiteVirtualTableCursorEnumerator).Name);
            }
#endif
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
................................................................................
    #endregion

    ///////////////////////////////////////////////////////////////////////////

    #region SQLiteModuleEnumerable Class
    /// <summary>
    /// This class implements a virtual table module that exposes an
    /// <see cref="IEnumerable" /> object instance as a read-only virtual
    /// table.  It is not sealed and may be used as the base class for any
    /// user-defined virtual table class that wraps an
    /// <see cref="IEnumerable" /> object instance.
    /// </summary>
    public class SQLiteModuleEnumerable : SQLiteModuleNoop /* NOT SEALED */
    {
        #region Private Constants
        /// <summary>
        /// The CREATE TABLE statement used to declare the schema for the
        /// virtual table.
................................................................................
        /// <returns>
        /// The value of <see cref="SQLiteErrorCode.Error"/>.
        /// </returns>
        protected virtual SQLiteErrorCode CursorTypeMismatchError(
            SQLiteVirtualTableCursor cursor
            )
        {
            SetCursorError(cursor, "not an \"enumerator\" cursor");
            return SQLiteErrorCode.Error;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Sets the table error message to one that indicates the virtual
................................................................................
        public override SQLiteErrorCode Open(
            SQLiteVirtualTable table,
            ref SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            cursor = new SQLiteVirtualTableCursorEnumerator(
                table, enumerable.GetEnumerator());

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

................................................................................
        /// </returns>
        public override SQLiteErrorCode Close(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerator enumeratorCursor =
                cursor as SQLiteVirtualTableCursorEnumerator;

            if (enumeratorCursor == null)
                return CursorTypeMismatchError(cursor);

            enumeratorCursor.Close();
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
................................................................................
            int indexNumber,
            string indexString,
            SQLiteValue[] values
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerator enumeratorCursor =
                cursor as SQLiteVirtualTableCursorEnumerator;

            if (enumeratorCursor == null)
                return CursorTypeMismatchError(cursor);

            enumeratorCursor.Filter(indexNumber, indexString, values);
            enumeratorCursor.Reset(); /* NO RESULT */
            enumeratorCursor.MoveNext(); /* IGNORED */

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
................................................................................
        /// </returns>
        public override SQLiteErrorCode Next(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerator enumeratorCursor =
                cursor as SQLiteVirtualTableCursorEnumerator;

            if (enumeratorCursor == null)
                return CursorTypeMismatchError(cursor);

            if (enumeratorCursor.EndOfEnumerator)
                return CursorEndOfEnumeratorError(cursor);

            enumeratorCursor.MoveNext(); /* IGNORED */
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Eof" /> method.
................................................................................
        /// </returns>
        public override bool Eof(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerator enumeratorCursor =
                cursor as SQLiteVirtualTableCursorEnumerator;

            if (enumeratorCursor == null)
                return ResultCodeToEofResult(CursorTypeMismatchError(cursor));

            return enumeratorCursor.EndOfEnumerator;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Column" /> method.
        /// </summary>
................................................................................
            SQLiteVirtualTableCursor cursor,
            SQLiteContext context,
            int index
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerator enumeratorCursor =
                cursor as SQLiteVirtualTableCursorEnumerator;

            if (enumeratorCursor == null)
                return CursorTypeMismatchError(cursor);

            if (enumeratorCursor.EndOfEnumerator)
                return CursorEndOfEnumeratorError(cursor);

            object current = enumeratorCursor.Current;

            if (current != null)
                context.SetString(GetStringFromObject(current));
            else
                context.SetNull();

            return SQLiteErrorCode.Ok;
................................................................................
        public override SQLiteErrorCode RowId(
            SQLiteVirtualTableCursor cursor,
            ref long rowId
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerator enumeratorCursor =
                cursor as SQLiteVirtualTableCursorEnumerator;

            if (enumeratorCursor == null)
                return CursorTypeMismatchError(cursor);

            if (enumeratorCursor.EndOfEnumerator)
                return CursorEndOfEnumeratorError(cursor);

            object current = enumeratorCursor.Current;

            rowId = GetRowIdFromObject(current);
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////