RoutineResolverExtensions.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
// 
//        http://www.apache.org/licenses/LICENSE-2.0
// 
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
//

using System;

using Deveel.Data;
using Deveel.Data.Sql;
using Deveel.Data.Sql.Expressions;

namespace Deveel.Data.Routines {
    public static class RoutineResolverExtensions {
        public static bool IsAggregateFunction(this IRoutineResolver resolver, Invoke request, IQuery query) {
            var routine = resolver.ResolveRoutine(request, query);

            var function = routine as IFunction;
            if (function == null)
                return false;

            return function.FunctionType == FunctionType.Aggregate;
        }

        public static IFunction ResolveFunction(this FunctionProvider resolver, string name) {
            return ResolveFunction(resolver, null, name);
        }

        public static IFunction ResolveFunction(this FunctionProvider resolver, IQuery context, string name) {
            return ResolveFunction(resolver, context, name, new SqlExpression[0]);
        }

        public static IFunction ResolveFunction(this FunctionProvider resolver, string name, params SqlExpression[] args) {
            return ResolveFunction(resolver, null, name, args);
        }

        public static IFunction ResolveFunction(this FunctionProvider resolver, string name, params DataObject[] args) {
            return ResolveFunction(resolver, null, name, args);
        }

        public static IFunction ResolveFunction(this FunctionProvider resolver, IQuery context, string name, params DataObject[] args) {
            var exps = new SqlExpression[0];
            if (args != null && args.Length > 0) {
                exps = new SqlExpression[args.Length];
                for (int i = 0; i < args.Length; i++) {
                    exps[i] = SqlExpression.Constant(args[i]);
                }
            }

            return resolver.ResolveFunction(context, name, exps);
        }

        public static IFunction ResolveFunction(this FunctionProvider resolver, IQuery query, string name, SqlExpression[] args) {
            var funName = new ObjectName(new ObjectName(resolver.SchemaName), name);
            var routine = ((IRoutineResolver) resolver).ResolveRoutine(new Invoke(funName, args), query);
            if (!(routine is IFunction))
                throw new InvalidOperationException();

            return routine as IFunction;
        }
    }
}