private static Bamboo.Query.Query.WhereClause GetWhere(System.Collections.ArrayList tokens, string from)
{
object predicate = null;
Bamboo.Query.Query.TokenReader tokenReader = new Bamboo.Query.Query.TokenReader(tokens);
string token;
while ((token = tokenReader.Peek()) != null)
{
switch (token)
{
case "AND":
{
tokenReader.Next();
if (predicate == null)
{
throw new System.Exception("Invalid query.");
}
predicate = new Bamboo.Query.Query.AndPredicate(predicate, ParseWherePredicate(tokenReader, from));
break;
}
case "OR":
{
tokenReader.Next();
if (predicate == null)
{
throw new System.Exception("Invalid query.");
}
predicate = new Bamboo.Query.Query.OrPredicate(predicate, ParseWherePredicate(tokenReader, from));
break;
}
default:
{
if (predicate != null)
{
throw new System.Exception("Invalid query.");
}
predicate = ParseWherePredicate(tokenReader, from);
break;
}
}
}
if (predicate == null)
{
return(null);
}
return(new Bamboo.Query.Query.WhereClause(predicate));
}
private Bamboo.Query.Predicates.Predicate CreatePredicate(object predicate)
{
if (predicate is Bamboo.Query.Query.AndPredicate)
{
Bamboo.Query.Query.AndPredicate andPredicate = (Bamboo.Query.Query.AndPredicate)predicate;
return(new Bamboo.Query.Predicates.AndPredicate(CreatePredicate(andPredicate.A), CreatePredicate(andPredicate.B)));
}
else if (predicate is Bamboo.Query.Query.EqualsPredicate)
{
Bamboo.Query.Query.EqualsPredicate equalsPredicate = (Bamboo.Query.Query.EqualsPredicate)predicate;
return(new Bamboo.Query.Predicates.EqualsPredicate(GetIndex(equalsPredicate.Column, this._node.ColumnCoordinates), equalsPredicate.Value));
}
else if (predicate is Bamboo.Query.Query.GreaterThanPredicate)
{
Bamboo.Query.Query.GreaterThanPredicate greaterThanPredicate = (Bamboo.Query.Query.GreaterThanPredicate)predicate;
return(new Bamboo.Query.Predicates.GreaterThanPredicate(GetIndex(greaterThanPredicate.Column, this._node.ColumnCoordinates), greaterThanPredicate.Value));
}
else if (predicate is Bamboo.Query.Query.LessThanPredicate)
{
Bamboo.Query.Query.LessThanPredicate lessThanPredicate = (Bamboo.Query.Query.LessThanPredicate)predicate;
return(new Bamboo.Query.Predicates.LessThanPredicate(GetIndex(lessThanPredicate.Column, this._node.ColumnCoordinates), lessThanPredicate.Value));
}
else if (predicate is Bamboo.Query.Query.NotEqualsPredicate)
{
Bamboo.Query.Query.NotEqualsPredicate notEqualsPredicate = (Bamboo.Query.Query.NotEqualsPredicate)predicate;
return(new Bamboo.Query.Predicates.NotEqualsPredicate(GetIndex(notEqualsPredicate.Column, this._node.ColumnCoordinates), notEqualsPredicate.Value));
}
else if (predicate is Bamboo.Query.Query.OrPredicate)
{
Bamboo.Query.Query.OrPredicate orPredicate = (Bamboo.Query.Query.OrPredicate)predicate;
return(new Bamboo.Query.Predicates.OrPredicate(CreatePredicate(orPredicate.A), CreatePredicate(orPredicate.B)));
}
else
{
throw new System.Exception("Invalid filter expression: " + predicate.GetType().FullName);
}
}
private static void GenerateWherePredicate(object predicate, System.Text.StringBuilder stringBuilder, ref bool first)
{
if (predicate is Bamboo.Query.Query.EqualsPredicate)
{
Bamboo.Query.Query.EqualsPredicate equalsPredicate = (Bamboo.Query.Query.EqualsPredicate)predicate;
if (first)
{
first = false;
}
else
{
stringBuilder.Append(", ");
}
Escape(stringBuilder, equalsPredicate.Column.Identifier);
stringBuilder.Append(" ");
stringBuilder.Append("=");
stringBuilder.Append(" ");
stringBuilder.Append("'");
stringBuilder.Append(equalsPredicate.Value);
stringBuilder.Append("'");
}
else if (predicate is Bamboo.Query.Query.OrPredicate)
{
Bamboo.Query.Query.OrPredicate orPredicate = (Bamboo.Query.Query.OrPredicate)predicate;
GenerateWherePredicate(orPredicate.A, stringBuilder, ref first);
GenerateWherePredicate(orPredicate.B, stringBuilder, ref first);
}
else if (predicate is Bamboo.Query.Query.AndPredicate)
{
Bamboo.Query.Query.AndPredicate andPredicate = (Bamboo.Query.Query.AndPredicate)predicate;
GenerateWherePredicate(andPredicate.A, stringBuilder, ref first);
GenerateWherePredicate(andPredicate.B, stringBuilder, ref first);
}
else
{
throw new System.Exception("Invalid query.");
}
}
private static object ParseCompoundPredicate(Bamboo.Query.Query.TokenReader tokenReader, string from)
{
object predicate = null;
string token;
while ((token = tokenReader.Peek()) != null)
{
switch (token)
{
case ")":
{
tokenReader.Next();
return(predicate);
}
case "AND":
{
tokenReader.Next();
if (predicate == null)
{
throw new System.Exception("Invalid query.");
}
predicate = new Bamboo.Query.Query.AndPredicate(predicate, ParseWherePredicate(tokenReader, from));
break;
}
case "OR":
{
tokenReader.Next();
if (predicate == null)
{
throw new System.Exception("Invalid query.");
}
predicate = new Bamboo.Query.Query.OrPredicate(predicate, ParseWherePredicate(tokenReader, from));
break;
}
default:
{
if (predicate != null)
{
throw new System.Exception("Invalid query.");
}
predicate = ParseWherePredicate(tokenReader, from);
break;
}
}
}
if (predicate != null)
{
return(predicate);
}
throw new System.Exception("Invalid query.");
}