Invoke.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 System.Linq;
using System.Text;

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

namespace Deveel.Data.Routines {
    public sealed class Invoke {
        private IRoutine cached;

        public Invoke(ObjectName routineName)
            : this(routineName, new SqlExpression[0]) {
        }

        public Invoke(ObjectName routineName, SqlExpression[] arguments) {
            RoutineName = routineName;
            Arguments = arguments;
        }

        public ObjectName RoutineName { get; private set; }

        public SqlExpression[] Arguments { get; private set; }

        public bool IsGlobArgument {
            get {
                return Arguments != null &&
                       Arguments.Length == 1 &&
                       Arguments[0] is SqlConstantExpression &&
                       ((SqlConstantExpression) Arguments[0]).Value.Value.ToString() == "*";
            }
        }

        public bool IsAggregate(IRequest query) {
            if (query.Query.IsAggregateFunction(this))
                return true;

            // Look at parameterss
            return Arguments.Any(x => x.HasAggregate(query));
        }

        public IRoutine ResolveRoutine(IRequest context) {
            if (cached != null)
                return cached;

            if (context == null) {
                cached = SystemFunctions.Provider.ResolveFunction(this, null);
            } else {
                cached = context.Query.ResolveRoutine(this);
            }

            if (cached == null)
                throw new InvalidOperationException(String.Format("Unable to resolve the call {0} to a function", this));

            return cached;
        }

        public IFunction ResolveFunction(IQuery context) {
            return ResolveRoutine(context) as IFunction;
        }

        public IProcedure ResolveProcedure(IQuery context) {
            return ResolveRoutine(context) as IProcedure;
        }
        
        public IFunction ResolveSystemFunction() {
            return ResolveRoutine(null) as IFunction;
        }

        public InvokeResult Execute() {
            return Execute(null);
        }

        public InvokeResult Execute(IRequest query) {
            return Execute(query, null);
        }

        public InvokeResult Execute(IRequest query, IVariableResolver resolver) {
            return Execute(query, resolver, null);
        }

        public InvokeResult Execute(IRequest query, IVariableResolver resolver, IGroupResolver group) {
            var routine = ResolveRoutine(query);
            var executeContext = new InvokeContext(this, routine, resolver, group, query);
            return routine.Execute(executeContext);
        }

        public override String ToString() {
            var buf = new StringBuilder();
            buf.Append(RoutineName);
            buf.Append('(');
            for (int i = 0; i < Arguments.Length; ++i) {
                buf.Append(Arguments[i]);
                if (i < Arguments.Length - 1) {
                    buf.Append(',');
                }
            }
            buf.Append(')');
            return buf.ToString();
        }
    }
}