66 lines
1.9 KiB
C++
66 lines
1.9 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 _RESULTIMPL_HPP
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#define _RESULTIMPL_HPP
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#include <xqilla/framework/XQillaExport.hpp>
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#include <xqilla/items/Item.hpp>
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#include <xqilla/ast/LocationInfo.hpp>
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class DynamicContext;
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class Sequence;
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class Result;
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class ResultBuffer;
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/** A lazily evaluated query result */
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class XQILLA_API ResultImpl : public LocationInfo
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{
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public:
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virtual ~ResultImpl() {}
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Result *getResultPointer() { return resultPointer_; }
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void setResultPointer(Result *p) { resultPointer_ = p; }
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/// Get the next item from the iterator. Returns null if the is no next value.
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virtual Item::Ptr next(DynamicContext *context);
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/// Gets the next item, or returns a tail call Result which will give the next item.
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virtual Item::Ptr nextOrTail(Result &tail, DynamicContext *context);
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/// Cast operator to a Sequence
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virtual Sequence toSequence(DynamicContext *context);
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/// Returns a result buffer of the result
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virtual void toResultBuffer(unsigned int readCount, ResultBuffer &buffer);
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/// Skip ahead
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virtual void skip(unsigned count, DynamicContext *context);
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protected:
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ResultImpl(const LocationInfo *o);
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Result *resultPointer_;
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private:
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ResultImpl(const ResultImpl &) {};
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ResultImpl &operator=(const ResultImpl &) { return *this; };
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};
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#endif
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