69 lines
2 KiB
C++
69 lines
2 KiB
C++
/*
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* Copyright (c) 2001-2006
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* DecisionSoft Limited. All rights reserved.
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* Copyright (c) 2004-2006
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* Progress Software Corporation. All rights reserved.
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* Copyright (c) 2004-2006
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* Oracle. All rights reserved.
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*
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* See the file LICENSE for redistribution information.
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*
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* $Id: ResultImpl.hpp,v 1.9 2006/11/01 16:37:15 jpcs Exp $
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*/
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#ifndef _RESULTIMPL_HPP
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#define _RESULTIMPL_HPP
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#include <string>
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#include <xercesc/util/XercesDefs.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/framework/ReferenceCounted.hpp>
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#include <xqilla/ast/LocationInfo.hpp>
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class SequenceType;
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class DynamicContext;
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class Sequence;
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/** A lazily evaluated query result */
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class XQILLA_API ResultImpl : public ReferenceCounted, public LocationInfo
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{
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public:
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virtual ~ResultImpl() {}
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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) = 0;
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/// Performs iterator specific skip of results
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virtual void skip() {}
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/// Returns the effective boolean value of the sequence. Only works properly before next() has been called.
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virtual bool getEffectiveBooleanValue(DynamicContext* context, const LocationInfo *info);
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/// Returns the effective boolean value of the sequence.
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static bool getEffectiveBooleanValue(const Item::Ptr &first, const Item::Ptr &second, DynamicContext* context, const LocationInfo *info);
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/// Cast operator to a Sequence. Only works properly before next() has been called.
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virtual Sequence toSequence(DynamicContext *context);
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/// Debug method to visualise the Result
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virtual std::string asString(DynamicContext *context, int indent) const = 0;
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static std::string getIndent(int indent);
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protected:
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/**
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* Do not allocate this object from a memory manager!
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* It must be created using the heap.
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*/
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ResultImpl(const LocationInfo *o)
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{
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setLocationInfo(o);
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}
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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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