# XQilla Simple API Documentation

- Main Page
- Namespaces
- Classes
- Files
- Examples

- File List
- File Members

# EventGenerator.hpp

Go to the documentation of this file.

    00001 /*
    00002  * Copyright (c) 2001, 2008,
    00003  *     DecisionSoft Limited. All rights reserved.
    00004  * Copyright (c) 2004, 2015 Oracle and/or its affiliates. All rights reserved.
    00005  *
    00006  *
    00007  * Licensed under the Apache License, Version 2.0 (the "License");
    00008  * you may not use this file except in compliance with the License.
    00009  * You may obtain a copy of the License at
    00010  *
    00011  *     http://www.apache.org/licenses/LICENSE-2.0
    00012  *
    00013  * Unless required by applicable law or agreed to in writing, software
    00014  * distributed under the License is distributed on an "AS IS" BASIS,
    00015  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    00016  * See the License for the specific language governing permissions and
    00017  * limitations under the License.
    00018  */
    00019
    00020 #ifndef _EVENTGENERATOR_HPP
    00021 #define _EVENTGENERATOR_HPP
    00022
    00023 #include <xqilla/framework/XQillaExport.hpp>
    00024 #include <xqilla/framework/ReferenceCounted.hpp>
    00025 #include <xqilla/runtime/ResultImpl.hpp>
    00026
    00027 class DynamicContext;
    00028 class EventHandler;
    00029 class ASTNode;
    00030 class QueryPathNode;
    00031
    00032 class XQILLA_API EventGenerator : public ReferenceCounted
    00033 {
    00034 public:
    00035   typedef RefCountPointer<EventGenerator> Ptr;
    00036
    00037   virtual ~EventGenerator() {}
    00038
    00041   virtual EventGenerator::Ptr generateEvents(EventHandler *events, DynamicContext *context) = 0;
    00042
    00043   static void generateAndTailCall(const EventGenerator::Ptr &generator, EventHandler *events,
    00044                                   DynamicContext *context)
    00045   {
    00046     EventGenerator::Ptr gen = generator;
    00047     while(gen.notNull()) {
    00048       gen = gen->generateEvents(events, context);
    00049     }
    00050   }
    00051
    00052   static Result createResult(const ASTNode *ast, const QueryPathNode *projection,
    00053     DynamicContext *context);
    00054 };
    00055
    00056 class XQILLA_API ASTNodeEventGenerator : public EventGenerator
    00057 {
    00058 public:
    00059   ASTNodeEventGenerator(const ASTNode *ast, bool preserveNS, bool preserveType);
    00060
    00061   virtual EventGenerator::Ptr generateEvents(EventHandler *events, DynamicContext *context);
    00062
    00063 protected:
    00064   const ASTNode *ast_;
    00065   bool preserveNS_, preserveType_;
    00066 };
    00067
    00068 #endif