XmlFunctionProvider.cs

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using System;

using Deveel.Data.Deveel.Data.Xml;
using Deveel.Data.Routines;
using Deveel.Data.Sql;
using Deveel.Data.Sql.Fluid;


namespace Deveel.Data.Xml {
    public sealed class XmlFunctionProvider : FunctionProvider {
        public override string SchemaName {
            get { return SystemSchema.Name; }
        }

        protected override ObjectName NormalizeName(ObjectName functionName) {
            if (functionName.Parent == null)
                functionName = new ObjectName(new ObjectName(SchemaName), functionName.Name);

            return base.NormalizeName(functionName);
        }

        private static InvokeResult Simple(InvokeContext context, Func<DataObject[], DataObject> func) {
            var args = context.EvaluatedArguments;
            var funcResult = func(args);
            return context.Result(funcResult);
        }

        protected override void OnInit() {
            Register(config => config.Named("to_xml")
                .WithStringParameter("s")
                .WhenExecute(context => Simple(context, args => XmlFunctions.XmlType(args[0])))
                .ReturnsType(XmlNodeType.XmlType));

            Register(config => config.Named("appendchildxml")
                .WithXmlParameter("obj")
                .WithStringParameter("xpath")
                .WithXmlParameter("value")
                .WhenExecute(context => Simple(context, args => XmlFunctions.AppendChild(args[0], args[1], args[2])))
                .ReturnsXmlType());

            Register(config => config.Named("extract")
                .WithXmlParameter("node")
                .WithStringParameter("xpath")
                .WhenExecute(context => Simple(context, args => XmlFunctions.Extract(args[0], args[1])))
                .ReturnsXmlType());

            Register(config => config.Named("extractvalue")
                .WithXmlParameter("node")
                .WithStringParameter("xpath")
                .WhenExecute(context => Simple(context, args => XmlFunctions.ExtractValue(args[0], args[1])))
                .ReturnsType(Function.DynamicType));

            Register(config => config.Named("existsxml")
                .WithXmlParameter("node")
                .WithStringParameter("xpath")
                .WhenExecute(context => Simple(context, args => XmlFunctions.Exists(args[0], args[1])))
                .ReturnsXmlType());

            Register(config => config.Named("insertbeforexml")
                .WithXmlParameter("node")
                .WithStringParameter("xpath")
                .WithXmlParameter("value")
                .WhenExecute(context => Simple(context, args => XmlFunctions.InsertBefore(args[0], args[1], args[2])))
                .ReturnsXmlType());

            Register(config => config.Named("insertchildxml")
                .WithXmlParameter("node")
                .WithStringParameter("xpath")
                .WithXmlParameter("child")
                .WithXmlParameter("value")
                .WhenExecute(context => Simple(context, args => XmlFunctions.InsertChild(args[0], args[1], args[2], args[3])))
                .ReturnsXmlType());

            Register(config => config.Named("updatexml")
                .WithXmlParameter("node")
                .WithStringParameter("xpath")
                .WithDynamicParameter("value")
                .WhenExecute(context => Simple(context, args => XmlFunctions.Update(args[0], args[1], args[2])))
                .ReturnsXmlType());
        }
    }
}