68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/*
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* Copyright (c) 2001, 2008,
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* DecisionSoft Limited. All rights reserved.
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* Copyright (c) 2004, 2018 Oracle and/or its affiliates. All rights reserved.
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*
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _EVENTGENERATOR_HPP
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#define _EVENTGENERATOR_HPP
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#include <xqilla/framework/XQillaExport.hpp>
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#include <xqilla/framework/ReferenceCounted.hpp>
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#include <xqilla/runtime/ResultImpl.hpp>
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class DynamicContext;
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class EventHandler;
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class ASTNode;
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class QueryPathNode;
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class XQILLA_API EventGenerator : public ReferenceCounted
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{
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public:
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typedef RefCountPointer<EventGenerator> Ptr;
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virtual ~EventGenerator() {}
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/** Returns the result of this expression via the EventHandler provided.
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An EventGenerator may be returned to be called as a tail call optimization */
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virtual EventGenerator::Ptr generateEvents(EventHandler *events, DynamicContext *context) = 0;
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static void generateAndTailCall(const EventGenerator::Ptr &generator, EventHandler *events,
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DynamicContext *context)
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{
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EventGenerator::Ptr gen = generator;
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while(gen.notNull()) {
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gen = gen->generateEvents(events, context);
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}
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}
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static Result createResult(const ASTNode *ast, const QueryPathNode *projection,
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DynamicContext *context);
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};
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class XQILLA_API ASTNodeEventGenerator : public EventGenerator
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{
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public:
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ASTNodeEventGenerator(const ASTNode *ast, bool preserveNS, bool preserveType);
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virtual EventGenerator::Ptr generateEvents(EventHandler *events, DynamicContext *context);
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protected:
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const ASTNode *ast_;
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bool preserveNS_, preserveType_;
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};
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#endif
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