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Overview
| Comment: | More work in progress fine-tuning the implementation. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | delegateFunction |
| Files: | files | file ages | folders |
| SHA1: |
ef7ebd64694b042d9dbf7f764a9b5c7f |
| User & Date: | mistachkin 2015-08-14 23:20:14.979 |
Context
|
2015-08-15
| ||
| 03:48 | Refactor SQLiteDelegateFunction constructor to accept two delegates, not one. Use early-bound delegates by default. Get tests passing. check-in: 3c25655a66 user: mistachkin tags: delegateFunction | |
|
2015-08-14
| ||
| 23:20 | More work in progress fine-tuning the implementation. check-in: ef7ebd6469 user: mistachkin tags: delegateFunction | |
|
2015-08-05
| ||
| 00:57 | Work in progress on tests. Not yet working. check-in: 56469328f7 user: mistachkin tags: delegateFunction | |
Changes
Changes to System.Data.SQLite/SQLiteFunction.cs.
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275 276 277 278 279 280 281 |
CheckDisposed();
return null;
}
/// <summary>
/// User-defined collating sequences override this method to provide a custom string sorting algorithm.
/// </summary>
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CheckDisposed();
return null;
}
/// <summary>
/// User-defined collating sequences override this method to provide a custom string sorting algorithm.
/// </summary>
/// <param name="param1">The first string to compare.</param>
/// <param name="param2">The second strnig to compare.</param>
/// <returns>1 if param1 is greater than param2, 0 if they are equal, or -1 if param1 is less than param2.</returns>
public virtual int Compare(string param1, string param2)
{
CheckDisposed();
return 0;
}
/// <summary>
|
| ︙ | ︙ | |||
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{
return sqliteBase.CreateCollation(
name, null, null, false) == SQLiteErrorCode.Ok;
}
}
}
/////////////////////////////////////////////////////////////////////////////
/// <summary>
/// This class implements a SQLite function using a <see cref="Delegate" />.
/// All the virtual methods of the <see cref="SQLiteFunction" /> class are
/// implemented using calls to the <see cref="Delegate.DynamicInvoke" />
| > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 |
{
return sqliteBase.CreateCollation(
name, null, null, false) == SQLiteErrorCode.Ok;
}
}
}
/////////////////////////////////////////////////////////////////////////////
/// <summary>
/// This <see cref="Delegate" /> type is used with the
/// <see cref="SQLiteDelegateFunction.Invoke" /> method.
/// </summary>
/// <param name="param0">
/// This is always the string literal "Invoke".
/// </param>
/// <param name="args">
/// The arguments for the scalar function.
/// </param>
/// <returns>
/// The result of the scalar function.
/// </returns>
public delegate object SQLiteInvokeDelegate(
string param0,
object[] args
);
/////////////////////////////////////////////////////////////////////////////
/// <summary>
/// This <see cref="Delegate" /> type is used with the
/// <see cref="SQLiteDelegateFunction.Step" /> method.
/// </summary>
/// <param name="param0">
/// This is always the string literal "Step".
/// </param>
/// <param name="args">
/// The arguments for the aggregate function.
/// </param>
/// <param name="stepNumber">
/// The step number (one based). This is incrememted each time the
/// <see cref="SQLiteDelegateFunction.Step" /> method is called.
/// </param>
/// <param name="contextData">
/// A placeholder for implementers to store contextual data pertaining
/// to the current context.
/// </param>
public delegate void SQLiteStepDelegate(
string param0,
object[] args,
int stepNumber,
ref object contextData
);
/////////////////////////////////////////////////////////////////////////////
/// <summary>
/// This <see cref="Delegate" /> type is used with the
/// <see cref="SQLiteDelegateFunction.Final" /> method.
/// </summary>
/// <param name="param0">
/// This is always the string literal "Final".
/// </param>
/// <param name="contextData">
/// A placeholder for implementers to store contextual data pertaining
/// to the current context.
/// </param>
/// <returns>
/// The result of the aggregate function.
/// </returns>
public delegate object SQLiteFinalDelegate(
string param0,
object contextData
);
/////////////////////////////////////////////////////////////////////////////
/// <summary>
/// This <see cref="Delegate" /> type is used with the
/// <see cref="SQLiteDelegateFunction.Compare" /> method.
/// </summary>
/// <param name="param0">
/// This is always the string literal "Compare".
/// </param>
/// <param name="param1">
/// The first string to compare.
/// </param>
/// <param name="param2">
/// The second strnig to compare.
/// </param>
/// <returns>
/// A positive integer if the <paramref name="param1" /> parameter is
/// greater than the <paramref name="param2" /> parameter, a negative
/// integer if the <paramref name="param1" /> parameter is less than
/// the <paramref name="param2" /> parameter, or zero if they are
/// equal.
/// </returns>
public delegate int SQLiteCompareDelegate(
string param0,
string param1,
string param2
);
/////////////////////////////////////////////////////////////////////////////
/// <summary>
/// This class implements a SQLite function using a <see cref="Delegate" />.
/// All the virtual methods of the <see cref="SQLiteFunction" /> class are
/// implemented using calls to the <see cref="Delegate.DynamicInvoke" />
|
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/// Returns the list of arguments for the <see cref="Invoke" /> method,
/// as an <see cref="Array" /> of <see cref="Object" />. The first
/// argument is always the literal string "Invoke".
/// </summary>
/// <param name="args">
/// The original arguments received by the <see cref="Invoke" /> method.
/// </param>
/// <returns>
/// The arguments to pass to the configured <see cref="Delegate" />.
/// </returns>
protected virtual object[] GetInvokeArgs(
| > > > > | > < < < < | < | < | | 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 |
/// Returns the list of arguments for the <see cref="Invoke" /> method,
/// as an <see cref="Array" /> of <see cref="Object" />. The first
/// argument is always the literal string "Invoke".
/// </summary>
/// <param name="args">
/// The original arguments received by the <see cref="Invoke" /> method.
/// </param>
/// <param name="earlyBound">
/// Non-zero if the returned arguments are going to be used with the
/// <see cref="SQLiteInvokeDelegate" /> type; otherwise, zero.
/// </param>
/// <returns>
/// The arguments to pass to the configured <see cref="Delegate" />.
/// </returns>
protected virtual object[] GetInvokeArgs(
object[] args,
bool earlyBound
) /* CANNOT RETURN NULL */
{
object[] newArgs = new object[] { "Invoke", args };
if (!earlyBound)
newArgs = new object[] { newArgs }; // WRAP
return newArgs;
}
/////////////////////////////////////////////////////////////////////////
/// <summary>
|
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/// The step number (one based). This is incrememted each time the
/// <see cref="Step" /> method is called.
/// </param>
/// <param name="contextData">
/// A placeholder for implementers to store contextual data pertaining
/// to the current context.
/// </param>
/// <returns>
/// The arguments to pass to the configured <see cref="Delegate" />.
/// </returns>
protected virtual object[] GetStepArgs(
object[] args,
int stepNumber,
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/// The step number (one based). This is incrememted each time the
/// <see cref="Step" /> method is called.
/// </param>
/// <param name="contextData">
/// A placeholder for implementers to store contextual data pertaining
/// to the current context.
/// </param>
/// <param name="earlyBound">
/// Non-zero if the returned arguments are going to be used with the
/// <see cref="SQLiteStepDelegate" /> type; otherwise, zero.
/// </param>
/// <returns>
/// The arguments to pass to the configured <see cref="Delegate" />.
/// </returns>
protected virtual object[] GetStepArgs(
object[] args,
int stepNumber,
object contextData,
bool earlyBound
) /* CANNOT RETURN NULL */
{
object[] newArgs = new object[] {
"Step", args, stepNumber, contextData
};
if (!earlyBound)
newArgs = new object[] { newArgs }; // WRAP
return newArgs;
}
/////////////////////////////////////////////////////////////////////////
/// <summary>
/// Updates the output arguments for the <see cref="Step" /> method,
/// using an <see cref="Array" /> of <see cref="Object" />. The first
/// argument is always the literal string "Step". Currently, only the
/// <paramref name="contextData" /> parameter is updated.
/// </summary>
/// <param name="args">
/// The original arguments received by the <see cref="Step" /> method.
/// </param>
/// <param name="contextData">
/// A placeholder for implementers to store contextual data pertaining
/// to the current context.
/// </param>
/// <param name="earlyBound">
/// Non-zero if the returned arguments are going to be used with the
/// <see cref="SQLiteStepDelegate" /> type; otherwise, zero.
/// </param>
/// <returns>
/// The arguments to pass to the configured <see cref="Delegate" />.
/// </returns>
protected virtual void UpdateStepArgs(
object[] args,
ref object contextData,
bool earlyBound
) /* CANNOT RETURN NULL */
{
object[] newArgs;
if (earlyBound)
newArgs = args;
else
newArgs = args[0] as object[];
if (newArgs == null)
return;
contextData = newArgs[newArgs.Length - 1];
}
/////////////////////////////////////////////////////////////////////////
/// <summary>
/// Returns the list of arguments for the <see cref="Final" /> method,
/// as an <see cref="Array" /> of <see cref="Object" />. The first
/// argument is always the literal string "Final".
/// </summary>
/// <param name="contextData">
/// A placeholder for implementers to store contextual data pertaining
/// to the current context.
/// </param>
/// <param name="earlyBound">
/// Non-zero if the returned arguments are going to be used with the
/// <see cref="SQLiteFinalDelegate" /> type; otherwise, zero.
/// </param>
/// <returns>
/// The arguments to pass to the configured <see cref="Delegate" />.
/// </returns>
protected virtual object[] GetFinalArgs(
object contextData,
bool earlyBound
) /* CANNOT RETURN NULL */
{
object[] newArgs = new object[] { "Final", contextData };
if (!earlyBound)
newArgs = new object[] { newArgs }; // WRAP
return newArgs;
}
/////////////////////////////////////////////////////////////////////////
/// <summary>
/// Returns the list of arguments for the <see cref="Compare" /> method,
/// as an <see cref="Array" /> of <see cref="Object" />. The first
/// argument is always the literal string "Compare".
/// </summary>
/// <param name="param1">
/// The first string to compare.
/// </param>
/// <param name="param2">
/// The second strnig to compare.
/// </param>
/// <param name="earlyBound">
/// Non-zero if the returned arguments are going to be used with the
/// <see cref="SQLiteCompareDelegate" /> type; otherwise, zero.
/// </param>
/// <returns>
/// The arguments to pass to the configured <see cref="Delegate" />.
/// </returns>
protected virtual object[] GetCompareArgs(
string param1,
string param2,
bool earlyBound
) /* CANNOT RETURN NULL */
{
object[] newArgs = new object[] { "Compare", param1, param2 };
if (!earlyBound)
newArgs = new object[] { newArgs }; // WRAP
return newArgs;
}
#endregion
/////////////////////////////////////////////////////////////////////////
#region Public Properties
private Delegate callback;
|
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#region System.Data.SQLite.SQLiteFunction Overrides
/// <summary>
/// This virtual method is the implementation for scalar functions.
/// See the <see cref="SQLiteFunction.Invoke" /> method for more
/// details.
/// </summary>
/// <param name="args">
| | < < > > > > > > > > > | > > | < < > > > > > > > > > | > | | | > | 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 |
#region System.Data.SQLite.SQLiteFunction Overrides
/// <summary>
/// This virtual method is the implementation for scalar functions.
/// See the <see cref="SQLiteFunction.Invoke" /> method for more
/// details.
/// </summary>
/// <param name="args">
/// The arguments for the scalar function.
/// </param>
/// <returns>
/// The result of the scalar function.
/// </returns>
public override object Invoke(
object[] args /* in */
)
{
if (callback == null)
throw new InvalidOperationException(NoCallbackError);
SQLiteInvokeDelegate invokeDelegate =
callback as SQLiteInvokeDelegate;
if (invokeDelegate != null)
{
return invokeDelegate.Invoke("Invoke", args); /* throw */
}
else
{
return callback.DynamicInvoke(
GetInvokeArgs(args, false)); /* throw */
}
}
/////////////////////////////////////////////////////////////////////////
/// <summary>
/// This virtual method is part of the implementation for aggregate
/// functions. See the <see cref="SQLiteFunction.Step" /> method
/// for more details.
/// </summary>
/// <param name="args">
/// The arguments for the aggregate function.
/// </param>
/// <param name="stepNumber">
/// The step number (one based). This is incrememted each time the
/// <see cref="Step" /> method is called.
/// </param>
/// <param name="contextData">
/// A placeholder for implementers to store contextual data pertaining
/// to the current context.
/// </param>
public override void Step(
object[] args, /* in */
int stepNumber, /* in */
ref object contextData /* in, out */
)
{
if (callback == null)
throw new InvalidOperationException(NoCallbackError);
SQLiteStepDelegate stepDelegate = callback as SQLiteStepDelegate;
if (stepDelegate != null)
{
stepDelegate.Invoke(
"Step", args, stepNumber, ref contextData); /* throw */
}
else
{
object[] newArgs = GetStepArgs(
args, stepNumber, contextData, false);
/* IGNORED */
callback.DynamicInvoke(newArgs); /* throw */
UpdateStepArgs(newArgs, ref contextData, false);
}
}
/////////////////////////////////////////////////////////////////////////
/// <summary>
/// This virtual method is part of the implementation for aggregate
/// functions. See the <see cref="SQLiteFunction.Final" /> method
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public override object Final(
object contextData /* in */
)
{
if (callback == null)
throw new InvalidOperationException(NoCallbackError);
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public override object Final(
object contextData /* in */
)
{
if (callback == null)
throw new InvalidOperationException(NoCallbackError);
SQLiteFinalDelegate finalDelegate = callback as SQLiteFinalDelegate;
if (finalDelegate != null)
{
return finalDelegate.Invoke("Final", contextData);
}
else
{
return callback.DynamicInvoke(GetFinalArgs(
contextData, callback is SQLiteFinalDelegate)); /* throw */
}
}
/////////////////////////////////////////////////////////////////////////
/// <summary>
/// This virtual method is part of the implementation for collating
/// sequences. See the <see cref="SQLiteFunction.Compare" /> method
|
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string param1, /* in */
string param2 /* in */
)
{
if (callback == null)
throw new InvalidOperationException(NoCallbackError);
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string param1, /* in */
string param2 /* in */
)
{
if (callback == null)
throw new InvalidOperationException(NoCallbackError);
SQLiteCompareDelegate compareDelegate =
callback as SQLiteCompareDelegate;
if (compareDelegate != null)
{
return compareDelegate.Invoke("Compare", param1, param2);
}
else
{
object result = callback.DynamicInvoke(GetCompareArgs(
param1, param2, false)); /* throw */
if (result is int)
return (int)result;
throw new InvalidOperationException(String.Format(
ResultInt32Error, "Compare"));
}
}
#endregion
}
/////////////////////////////////////////////////////////////////////////////
/// <summary>
|
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