/// <summary>
/// Visits the instance function.
/// </summary>
private static void VisitFunc(MethodCallExpression expression, CacheQueryExpressionVisitor visitor,
string func, string suffix, params int[] adjust)
{
visitor.ResultBuilder.Append(func).Append("(");
var isInstanceMethod = expression.Object != null;
if (isInstanceMethod)
{
visitor.Visit(expression.Object);
}
for (int i = 0; i < expression.Arguments.Count; i++)
{
var arg = expression.Arguments[i];
if (isInstanceMethod || (i > 0))
{
visitor.ResultBuilder.Append(", ");
}
visitor.Visit(arg);
AppendAdjustment(visitor, adjust, i + 1);
}
visitor.ResultBuilder.Append(suffix).Append(")");
AppendAdjustment(visitor, adjust, 0);
}
/// <summary>
/// Visits the constant call expression.
/// </summary>
public static bool VisitConstantCall(ConstantExpression expression, CacheQueryExpressionVisitor visitor)
{
if (expression.Type != typeof(RegexOptions))
{
return(false);
}
var regexOptions = expression.Value as RegexOptions? ?? RegexOptions.None;
var result = string.Empty;
foreach (var option in RegexOptionFlags)
{
if (regexOptions.HasFlag(option.Key))
{
result += option.Value;
regexOptions &= ~option.Key;
}
}
if (regexOptions != RegexOptions.None)
{
throw new NotSupportedException(string.Format("RegexOptions.{0} is not supported", regexOptions));
}
visitor.AppendParameter(result);
return(true);
}
/// <summary>
/// Visits the SQL like expression.
/// </summary>
private static void VisitSqlLike(MethodCallExpression expression, CacheQueryExpressionVisitor visitor, string likeFormat)
{
visitor.ResultBuilder.Append("(");
visitor.Visit(expression.Object);
visitor.ResultBuilder.AppendFormat(" like {0}) ", likeFormat);
var arg = expression.Arguments[0] as ConstantExpression;
var paramValue = arg != null ? arg.Value : visitor.RegisterEvaluatedParameter(expression.Arguments[0]);
visitor.Parameters.Add(paramValue);
}
/// <summary>
/// Visits the method call expression.
/// </summary>
public static void VisitMethodCall(MethodCallExpression expression, CacheQueryExpressionVisitor visitor)
{
var mtd = expression.Method;
VisitMethodDelegate del;
if (!Delegates.TryGetValue(mtd, out del))
{
throw new NotSupportedException(string.Format("Method not supported: {0}.({1})",
mtd.DeclaringType == null ? "static" : mtd.DeclaringType.FullName, mtd));
}
del(expression, visitor);
}
/// <summary>
/// Visits the instance function for Trim specific handling.
/// </summary>
private static void VisitParameterizedTrimFunc(MethodCallExpression expression,
CacheQueryExpressionVisitor visitor, string func)
{
visitor.ResultBuilder.Append(func).Append("(");
visitor.Visit(expression.Object);
var arg = expression.Arguments[0];
if (arg != null)
{
visitor.ResultBuilder.Append(", ");
if (arg.NodeType == ExpressionType.Constant)
{
var constant = (ConstantExpression)arg;
if (constant.Value is char)
{
visitor.AppendParameter((char)constant.Value);
}
else
{
var args = constant.Value as IEnumerable <char>;
if (args == null)
{
throw new NotSupportedException("String.Trim function only supports IEnumerable<char>");
}
var enumeratedArgs = args.ToArray();
if (enumeratedArgs.Length != 1)
{
throw new NotSupportedException("String.Trim function only supports a single argument: " +
expression);
}
visitor.AppendParameter(enumeratedArgs[0]);
}
}
else
{
visitor.Visit(arg);
}
}
visitor.ResultBuilder.Append(")");
}
/// <summary>
/// Visits member expression argument.
/// </summary>
private static void VisitArg(CacheQueryExpressionVisitor visitor, MethodCallExpression expression, int idx,
bool lower)
{
if (lower)
{
visitor.ResultBuilder.Append("lower(");
}
visitor.Visit(expression.Arguments[idx]);
if (lower)
{
visitor.ResultBuilder.Append(")");
}
}
/// <summary>
/// Visits string.Compare method
/// </summary>
private static void VisitStringCompare(MethodCallExpression expression, CacheQueryExpressionVisitor visitor, bool ignoreCase)
{
// Ex: nvl2(?, casewhen(_T0.NAME = ?, 0, casewhen(_T0.NAME >= ?, 1, -1)), 1)
visitor.ResultBuilder.Append("nvl2(");
visitor.Visit(expression.Arguments[1]);
visitor.ResultBuilder.Append(", casewhen(");
VisitArg(visitor, expression, 0, ignoreCase);
visitor.ResultBuilder.Append(" = ");
VisitArg(visitor, expression, 1, ignoreCase);
visitor.ResultBuilder.Append(", 0, casewhen(");
VisitArg(visitor, expression, 0, ignoreCase);
visitor.ResultBuilder.Append(" >= ");
VisitArg(visitor, expression, 1, ignoreCase);
visitor.ResultBuilder.Append(", 1, -1)), 1)");
}
/// <summary>
/// Appends the adjustment.
/// </summary>
private static void AppendAdjustment(CacheQueryExpressionVisitor visitor, int[] adjust, int idx)
{
if (idx < adjust.Length)
{
var delta = adjust[idx];
if (delta > 0)
{
visitor.ResultBuilder.AppendFormat(" + {0}", delta);
}
else if (delta < 0)
{
visitor.ResultBuilder.AppendFormat(" {0}", delta);
}
}
}
/// <summary>
/// Visits the property call expression.
/// </summary>
public static bool VisitPropertyCall(MemberExpression expression, CacheQueryExpressionVisitor visitor)
{
string funcName;
if (!Properties.TryGetValue(expression.Member, out funcName))
{
return(false);
}
visitor.ResultBuilder.Append(funcName).Append('(');
visitor.Visit(expression.Expression);
visitor.ResultBuilder.Append(')');
return(true);
}
/// <summary>
/// Visits the instance function.
/// </summary>
private static void VisitFunc(MethodCallExpression expression, CacheQueryExpressionVisitor visitor,
string func, string suffix, params int[] adjust)
{
visitor.ResultBuilder.Append(func).Append("(");
var isInstanceMethod = expression.Object != null;
if (isInstanceMethod)
{
visitor.Visit(expression.Object);
}
for (int i = 0; i < expression.Arguments.Count; i++)
{
var arg = expression.Arguments[i];
if (isInstanceMethod || (i > 0))
{
visitor.ResultBuilder.Append(", ");
}
if (arg.NodeType == ExpressionType.NewArrayInit)
{
// Only trim methods use params[], only one param is supported
var args = ((NewArrayExpression)arg).Expressions;
if (args.Count != 1)
{
throw new NotSupportedException("Method call only supports a single parameter: " + expression);
}
visitor.Visit(args[0]);
}
else
{
visitor.Visit(arg);
}
AppendAdjustment(visitor, adjust, i + 1);
}
visitor.ResultBuilder.Append(suffix).Append(")");
AppendAdjustment(visitor, adjust, 0);
}
