modules/platforms/dotnet/Apache.Ignite.Linq/Impl/CacheQueryParser.cs

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

namespace Apache.Ignite.Linq.Impl
{
    using System.Threading;
    using Apache.Ignite.Linq.Impl.Dml;
    using Remotion.Linq.Parsing.ExpressionVisitors.Transformation;
    using Remotion.Linq.Parsing.ExpressionVisitors.TreeEvaluation;
    using Remotion.Linq.Parsing.Structure;
    using Remotion.Linq.Parsing.Structure.ExpressionTreeProcessors;
    using Remotion.Linq.Parsing.Structure.NodeTypeProviders;

    /// <summary>
    /// Cache query parser.
    /// </summary>
    internal static class CacheQueryParser
    {
        /** */
        private static readonly ThreadLocal<QueryParser> ThreadLocalInstance =
            new ThreadLocal<QueryParser>(CreateParser);

        /// <summary>
        /// Gets the default instance for current thread.
        /// </summary>
        public static QueryParser Instance
        {
            get { return ThreadLocalInstance.Value; }
        }

        /// <summary>
        /// Creates the parser.
        /// </summary>
        private static QueryParser CreateParser()
        {
            var transformerRegistry = ExpressionTransformerRegistry.CreateDefault();

            var proc = CreateCompoundProcessor(transformerRegistry);

            var parser = new ExpressionTreeParser(CreateNodeTypeProvider(), proc);

            return new QueryParser(parser);
        }

        /// <summary>
        /// Creates the node type provider.
        /// </summary>
        private static INodeTypeProvider CreateNodeTypeProvider()
        {
            var methodInfoRegistry = MethodInfoBasedNodeTypeRegistry.CreateFromRelinqAssembly();

            methodInfoRegistry.Register(RemoveAllExpressionNode.GetSupportedMethods(), 
                typeof(RemoveAllExpressionNode));

            methodInfoRegistry.Register(UpdateAllExpressionNode.GetSupportedMethods(),
                typeof(UpdateAllExpressionNode));

            return new CompoundNodeTypeProvider(new INodeTypeProvider[]
            {
                methodInfoRegistry,
                MethodNameBasedNodeTypeRegistry.CreateFromRelinqAssembly()
            });
        }

        /// <summary>
        /// Creates CompoundExpressionTreeProcessor.
        /// </summary>
        private static CompoundExpressionTreeProcessor CreateCompoundProcessor(
            IExpressionTranformationProvider tranformationProvider)
        {
            return new CompoundExpressionTreeProcessor(
                new IExpressionTreeProcessor[]
                {
                    new PartialEvaluatingExpressionTreeProcessor(new NullEvaluatableExpressionFilter()),
                    new TransformingExpressionTreeProcessor(tranformationProvider)
                });
        }

        /// <summary>
        /// Empty implementation of IEvaluatableExpressionFilter.
        /// </summary>
        private sealed class NullEvaluatableExpressionFilter : EvaluatableExpressionFilterBase
        {
            // No-op.
        }
    }
}